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www.irf.com page 1 of 41 iraudamp7d rev 2.9 iraudamp7d 25w-500w scalable output power class d audio power amplifier reference design using the irs2092 protected digital audio driver by jun honda, manuel rodrguez, wenduo liu caution: international rectifier suggests the following guidelines for safe operation and handling of iraudamp7d demo board: ? always wear safety glasses whenever operating demo board ? avoid personal contact with exposed metal surfaces when operating demo board ? turn off demo board when placing or removing measurement probes
www.irf.com page 2 of 41 iraudamp7d rev 2.9 item table of contents page 1 introduction of scalable design ???????????????????.. 3 2 power table values for each power model??????????????? 4 3 specifications??????????????????????????? 4-5 4 connection setup?????????????????????????. 6 5 test procedure?????????????????????????..? 7 6 performance and test graphs???????????????????.? 8-13 7 clipping characteristics??????????????????????? 14 8 efficiency????????????????????????????? 14-16 9 thermal consideratio ns??????????? ??????...????? 16 10 psrr, half bridge, full bridge????????????????????. 16 11 short circuit response???????????????????????.. 17-18 12 iraudamp7d overview?????????????????????.? 18-19 13 functions descriptions??????????????????????? 20-22 14 selectable dead time?????????????..?????????? 22 15 protection features?????????????????..??????? 22-25 16 click and pop noise control????????????????.????? 25 17 bus pumping????????????????????.??????? 26 18 bridged configuration???????????????.??..?????? 27 19 input signal and gain???????????????.????????. 28 20 gain settings???????????????????????????. 29 21 schematics???????????????????????????? 30-32 22 bill of materials????????????????????????..?? 33-36 23 iraudamp7d models differential table???????????????... 36 24 hardware????????????????????????????? 37-38 25 pcb specifications????????????????????????? 39 26 assembly drawings??????????????????????.?? 40 27 revision changes descriptions???????????????????.. 41
www.irf.com page 3 of 41 iraudamp7d rev 2.9 introduction the iraudamp7d reference design is a two-channel cl ass d audio power amplifie r that features output power scalability. the iraudamp7d offers selectable half-bridge (stereo) and full-bridge (bridged) modes. this reference design demonstrates how to use the irs 2092 class d audio driver ic, along with ir?s digital audio dual mosfets, such as irfi4024h-117p, irfi4019h-117p, irfi4212h-117p and irfi4020h-117p, on a single layer pcb. the design shows how to implem ent peripheral circuits on an optimum pcb layout using a single sided board. the resulting design requires a small heatsink for normal operation (one-eighth of continuous rated power). the reference design provides all the required housekeeping power supplies and protections. unless otherwise noted, this user?s manual is based on 150v model, IRAUDAMP7D-150,. other output power versions can be configured by replacing components given in the component selection of table 5 on page 36 applications ? av receivers ? home theater systems ? mini component stereos ? powered speakers ? sub-woofers ? musical instrument amplifiers ? automotive after market amplifiers features output power: scalable output power from 25w- 500w (see table 1) residual noise: 200 ? v, ihf-a weighted, aes-17 filter distortion: 0.05 % thd+n @ 60w, 4 ? efficiency: 90 % @ 500w, 8 ? , class d stage multiple protection features: over-current pr otection (ocp), high side and low side mosfet over-voltage protection (ovp), under-voltage protection (uvp), high side and low side mosfet dc-protection (dcp), over-temperature protection (otp) pwm topology: self-oscillating pwm, half-brid ge or full-bridge topologies selectable
www.irf.com page 4 of 41 iraudamp7d rev 2.9 table 1 iraudamp7d specification table series model name item amp7d-55 amp7d-100 amp7d-150 amp7d-200 ir power mosfet fet1a, fet1b irfi4024h-117p irfi4212h-117p irfi4019h-117p irfi4020h-117p 8 ? 25w x 2 60w x 2 125w x 2 250w x 2 half bridge 4 ? 50w x 2 120w x 2 250w x 2 not supported full bridge 8 ? 100w x 1 240w x 1 500w x 1 not supported nominal supply voltage +b, -b 25v 35v 50v 70v min/max supply voltage +b, -b 20v ~ 28v 28v ~ 45v 45v ~ 60v 60v ~ 80v voltage gain gv 20 30 36 40 notes: ? all the power ratings are at clipping power (thd+n = 1 %). to estimate power ratings at thd+n=10%, multiply them by 1.33 ? see table 5 on page 36 for the complete listing of components table. specifications general test conditions for IRAUDAMP7D-150 (unl ess otherwise noted) notes / conditions power supply voltages 50v load impedance 4 ? self-oscillating fr equency 400khz voltage gain 36 electrical data typical notes / conditions ir devices used irs2092, protected digital audio driver irfi4024h-117p, irfi4019h-117p , irfi4212h-117p, irfi4020h- 117p digital audio mosfets pwm modulator self-oscillating, second order sigma-delta modulation, analog input power supply range 45v to 60v or see table 1 above output power ch1-2: (1 % thd+n) 300w 1khz output power ch1-2: (10 % thd+n) 400w 1khz rated load impedance 8 - 4 ? resistive load standby supply current +50 ma/-80 ma no input signal total idle power consumption 7w no input signal channel efficiency 90 % single-channel driven, 120w .
www.irf.com page 5 of 41 iraudamp7d rev 2.9 audio performance before demodulator class d output notes / conditions thd+n, 1w thd+n, 10w thd+n, 60w thd+n, 100w 0.09 % 0.03 % 0.03 % 0.08 % 0.1 % 0.04 % 0.05 % 0.10 % 1khz, single-channel driven dynamic range 100 db 100 db a-weighted, aes-17 filter, single-channel operation residual noise 200 ? v 200 ? v 22 hz ? 20khz, aes17 filter self-oscillating frequency 400khz damping factor 2000 170 1khz, relative to 4 ? load channel separation 95 db 85 db 75 db 90 db 80 db 65 db 100hz 1khz 10khz frequency response : 20 hz- 20khz 20 hz-35khz 3 db 1w, 4 ? ? 8 ? load thermal performance (t a =25 ? c) condition typical notes / conditions idling t c =30 ? c t pcb =37 ? c no signal input 2 ch x 15w (1/8 rated power) t c =54 ? c t pcb =67 ? c 2 ch x 120w (rated power) t c =80 ? c t pcb =106 ? c otp shutdown after 150 s physical specifications dimensions 6?(l) x 4?(w) x 1.25?(h) 150 mm (l) x 100 mm (w) x 35 mm(h) weight 0.330kgm test setup
www.irf.com page 6 of 41 iraudamp7d rev 2.9 fig 1 typical test setup connector description ch1 in rca1a analog input for ch1 ch2 in rca1b analog input for ch2 supply cnn1 positive and negative supply (+b / -b) ch1 out spk1a output for ch1 ch2 out spk1b output for ch2 switches descriptions s1 shutdown pwm s300 half bridge / full bridge select indicator description led1a, b pwm (presence of low side gate signal) led2a,b protection spk1a spk1b g led1 +b, 5a dc supply 4 ohm 4 ohm -b, 5a dc supply a udio si g nal led2 led1 led2 s1 s300 cnn1 rca1a rca1b
www.irf.com page 7 of 41 iraudamp7d rev 2.9 test procedures test setup: 1. on the unit under test (uut), set switch s1 to off and s300 to stereo positions. 2. connect 4 ? -200 w dummy loads to output connectors, spkr1a and spkr1b, as shown on fig 1. 3. set up a dual power supply 50v with 5a current limit 4. turn off the dual power supply before connecting to uut. 5. connect the dual power supply to cnn1, as shown in fig 1. power up: 6. turn on the dual power supply. the b supplies must be applied and removed at the same time. 7. the red leds (protections) turn on immediately and stay on as long as s1 is in off position. blue leds stay off. 8. quiescent current for the positive and negative supplies must be less than 50ma, while s1 is in off position. under this condition, irs2092 is in shutdown mode. 9. slide s1 to on position; after one second delay, the two blue leds turn on and the red leds turns off. the two blue leds indicate that pwm oscillation is present. this transition delay time is controlled by csd pin of irs2092, capacitor cp3 10. under the normal operating condition with no input signal applied, quiescent current for the positive supply must be less than 50 ma; the negative supply current must be less than 100 ma. switching frequency test: 11. with an oscilloscope, monitor switching waveform at test points vs1 of vs2 and l1b of ch2. self oscillating frequency must be 400khz ? 25khz. note: the self-oscillating switching frequency is pre-calibrated to 400khz by the value of r11. to change switching frequency, change the resistances of r11a and r11b for ch1 and ch2 respectively. audio functionality tests: 12. set the signal generator to 1khz, 20 mv rms output. 13. connect audio signal generators to rca1a and rca1b. 14. sweep the audio signal voltage from 15 mv rms to 1 v rms . 15. monitor the output signals at spk1a/b with an oscilloscope. waveform must be a non distorted sinusoidal signal. 16. observe 1 v rms input generates output voltage of 36 v rms . the ratio, r8/(r7+r2), determines the voltage gain of iraudamp7d. 17. set switch s300 to bridged position. 18. observe that voltage gain doubles.
www.irf.com page 8 of 41 iraudamp7d rev 2.9 test setup using audio precision (ap): 19. use unbalance-floating signal generator outputs. 20. use balanced inputs taken across output terminals, spkr1a and spkr1b. 21. connect ap frame ground to gnd in terminal cnn1. 22. place aes-17 filter for all the testing except frequency response. 23. use signal voltage sweep range from 15 mv rms to 1 v rms . 24. run ap test programs for all subsequent tests as shown in fig 2- fig 13 below. test results 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 100 200m 500m 1 2 5 10 20 50 w blue = ch1, red = ch2 b supply = 25v, 4 ? resistive load fig 2 iraudamp7d-55, thd+n ve rsus power, stereo, 4 ? .
www.irf.com page 9 of 41 iraudamp7d rev 2.9 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 200 200m 500m 1 2 5 10 20 50 100 w blue = ch1, pink = ch2 b supply = 35v, 4 ? resistive load fig 3 iraudamp7d-100, thd+n versus power, stereo, 4 ? . 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 500 200m 500m 1 2 5 10 20 50 100 200 w b supply = 35v, 8 ? resistive load, bridged fig 4 iraudamp7d-100, thd+n versus power, bridged, 8 ?
www.irf.com page 10 of 41 iraudamp7d rev 2.9 . 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 500 200m 500m 1 2 5 10 20 50 100 200 w blue = ch1, pink = ch2 b supply = 50v, 4 ? resistive load fig 5 IRAUDAMP7D-150, thd+n versus power, stereo, 4 ? . 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 800 200m 500m 1 2 5 10 20 50 100 200 w b supply = 50v, 8 ? resistive load fig 6 IRAUDAMP7D-150, thd+n versus power, bridged 8 ? .
www.irf.com page 11 of 41 iraudamp7d rev 2.9 blue = ch1, red = ch2 b supply = 70v, 8 ? resistive load fig 7 iraudamp7d-200, thd+n versus power, stereo 8 ? . -10 +4 -9 -8 -7 -6 -5 -4 -3 -2 -1 -0 +1 +2 +3 d b r a 20 200k 50 100 200 500 1k 2k 5k 10k 20k 50k 100k hz red ch1 - 4 ? , 2 v output referenced blue ch1 - 8 ? , 2 v output referenced fig 8 frequency response (all models) . 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 500 200m 500m 1 2 5 10 20 50 100 200 w
www.irf.com page 12 of 41 iraudamp7d rev 2.9 0.0001 100 0.001 0.01 0.02 0.05 0.1 0.5 1 10 50 % 20 20k 50 100 200 500 1k 2k 5k 10k hz blue ch1, 10w output pink ch1, 50w output fig 9 IRAUDAMP7D-150, thd+n versus frequency , 4 ? . -110 +0 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 20 20k 50 100 200 500 1k 2k 5k 10k hz 1v output fig 10 IRAUDAMP7D-150, 1 khz ? 1 v output spectrum, stereo .
www.irf.com page 13 of 41 iraudamp7d rev 2.9 -110 +0 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 20 20k 50 100 200 500 1k 2k 5k 10k hz 1v output fig 11 IRAUDAMP7D-150, 1 khz - 1v output spectrum, bridged . -140 +20 -120 -100 -80 -60 -40 -20 +0 d b v 10 20k 20 50 100 200 500 1k 2k 5k 10k hz red ch1 - acd, no signal, self oscillator @ 400khz blue ch2 - acd, no signal, self oscillator @ 400khz fig 12 IRAUDAMP7D-150 noise floor .
www.irf.com page 14 of 41 iraudamp7d rev 2.9 . 60 w / 4 ? , 1 khz, thd+n = 0.02 % 250 w / 4 ? , 1 khz, thd+n = 10 % measured output and distortion waveforms fig 13 clipping characteristics . efficiency figs 14-19 show efficiency characteristics of the iraudamp7d. the high efficiency is achieved by following major factors: 1) low conduction loss due to the dual fets offering low r ds(on) 2) low switching loss due to the dual fets offering low input capacitance for fast rise and fall times 3) secure dead-time provided by the irs2092, avoiding cross-conduction 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 102030405060 output power (w) efficiency (% ) 25v-4ohms b supply = 25 v fig 14 efficiency versus output power, iraudamp7d-55, 4 ? , stereo red trace: total distortion + noise voltage gold trace: output voltage
www.irf.com page 15 of 41 iraudamp7d rev 2.9 . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 20406080100120140160 output power (w) efficiency (%) 35v-4ohms b supply = 35 v fig 15 efficiency versus output power, iraudamp7d-100, 4 ? , stereo . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 50 100 150 200 250 300 output power (w) efficiency (% ) 35v-8ohms-full bridge b supply = 35v fig 16 efficiency versus output power, iraudamp7d-100, 8 ? , bridged . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0 50 100 150 200 250 300 output power (w) efficiency (%) 50v-4ohms b supply = 50v fig 17 efficiency versus output power, IRAUDAMP7D-150, 4 ? , stereo
www.irf.com page 16 of 41 iraudamp7d rev 2.9 . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 50 100 150 200 250 300 350 400 450 500 550 output power (w) efficiency (% ) 50v-8ohms-full bridge b supply = 50v fig 18 efficiency versus output power, IRAUDAMP7D-150, 8 ? , bridged . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 50 100 150 200 250 300 output power (w) efficiency (% ) 70v-8ohms b supply = 70v fig 19 efficiency versus output power, iraudamp7d-200, 8 ? , stereo thermal considerations with this high efficiency, the iraudamp7d design can handle one-eighth of the continuous rated power, which is generally considered to be a normal operating condition for safety standards, without additional heatsink or forced air-cooling. power supply rejection ratio (psrr) the iraudamp7d obtains good power supply rejection ratio of -65 db at 1khz shown in fig 20. with this high psrr, iraudamp7d accepts any power supply topology as far as the supply voltages fit in the min and max range.
www.irf.com page 17 of 41 iraudamp7d rev 2.9 cyan: vaa & vss are fed by +/-b bus green: vaa & vss are fed by external +/-5 v regulated power supplies. fig 20 iraudamp7d power supply rejection ratio short circuit protection response figs 21-23 show over current protection reaction time of the iraudamp7d in a short circuit event. as soon as the irs2092 detects over current condition, it shuts down pwm. after one second, the irs2092 tries to resume the pwm. if the short circuit persists, the irs2092 repeats try and fail sequences until the short circuit is removed. short circuit in positive and negative load current fig 21 positive and negative ocp waveforms . load current csd p in load current positive ocp csd p in vs p in negative ocp vs p in
www.irf.com page 18 of 41 iraudamp7d rev 2.9 ocp waveforms showing csd trip and hiccup . fig 22 ocp response with continuous short circuit . actual reaction time ocp waveforms showing actual reaction time . fig. 23 high and low side ocp current waveform reaction time iraudamp7d overview the iraudamp7d features a self-oscillating type pwm modulator for the lowest component count, highest performance and robust design. this topology represents an analog version of a second-order sigma-delta modulation having a class d switching stage inside the loop. the load current csd p in load current csd p in vs p in vs p in load current
www.irf.com page 19 of 41 iraudamp7d rev 2.9 benefit of the sigma-delta modulation, in comparis on to the carrier-signal based modulation, is that all the error in the audible frequency range is shifted to the inaudible upper-frequency range by nature of its operation. also, sigma-delta modul ation allows a designer to apply a sufficient amount of error correction. the iraudamp7d self-oscillating topology consists of following essential functional blocks. ? front-end integrator ? pwm comparator ? level shifters ? gate drivers and mosfets ? output lpf integrator referring to fig 24 below, the input operational amplifier of the irs2092 forms a front-end second- order integrator with r7, c4, c6, and r11. the integrator that receives a rectangular feedback signal from the pwm output via r8 and audio input signal via r7 generates quadratic carrier signal in comp pin. the analog input signal shifts the average value of the quadratic waveform such that the duty cycle varies according to the instantaneous voltage of the analog input signal. pwm comparator the carrier signal in comp pin is converted to pwm signal by an internal comparator that has threshold at middle point between vaa and vss. the co mparator has no hysteresis in its input threshold. level shifters the internal input level-shifter transfers the pwm signal down to the low-side gate driver section. the gate driver section has another level-shifter that level shifts up the high-side gate signal to the high-side gate driver section. gate drivers and mosfets the received pwm signal is sent to the dead-time generation block where a programmable amount of dead time is added into the pwm signal between the two gate output signals of lo and ho to prevent potential cross conduction across the output power mosfets. the high-side level- shifter shifts up the high-side gate drive signal out of the dead-time block. the irs2092 drives two mosfets, high- and low-sides, in the power stage providing the amplified pwm waveform. output lpf
www.irf.com page 20 of 41 iraudamp7d rev 2.9 the amplified pwm output is reconstructed back to analog signal by the output lc lpf. demodulation lc low-pass filter (lpf) formed by l1 and c12, filters out the class d switching carrier signal leaving the audio output at the speaker load. a single stage output filter can be used with switching frequencies of 400 khz and greater; a design with a lower switching frequency may require an additional stage of lpf. + - . -b . . r7 in- comp c6 . -vss +vaa lo vs vcc d3 cp6 vb 0v +b 0v r11 c7 r117 cp5 ho c12 input c4 r8 r118 cp2 +vcc integrator com r25 modulator and shift level gnd 0v -b 0v lp filter l1 cp4 r24 irs2092 +b irfi4019h-117p irfi4212h-117p fet1 irfi4020h-117p irfi4024h-117p fig 24 simplified block diagram of iraudamp7d class d amplifier functional descriptions irs2092 gate driver ic the iraudamp7d uses irs2092, a high-voltage (up to 200 v), high-speed power mosfet driver with internal dead-time and protection functions specifically designed for class d audio amplifier applications. these functions include ocp and uvp. the irs2092 integrates bi- directional over current protection for both high-side and low-side mosfets. the dead-time can be selected for optimized performance according to the size of the mosfet, minimizing dead- time while preventing shoot-through. as a result, there is no gate-timing adjustment required externally. selectable dead-time through the dt pin voltage is an easy and reliable function which requires only two external resistors, r26 and r27 as shown on fig 25 below. the irs2092 offers the following functions. ? pwm modulator
www.irf.com page 21 of 41 iraudamp7d rev 2.9 ? dead-time insertion ? over current protection ? under voltage protection ? level shifters refer to irs2092 datasheet and an-1138 for more details. r13 10k r12 8.7k r21 10r r25 20r r24 20r r19 10k r18 9.6k r22 10k c11 0.1uf,100v r17 75k -b vcc r23 4.7k 10uf cp3 r11 270r c6 1nf c4 1nf r20 4.7r lo 11 vs 13 ho 14 vcc 12 gnd 2 vaa 1 com 10 dt 9 ocse t 8 in- 3 comp 4 csd 5 vss 6 vre f 7 vb 15 csh 16 u1 irs2092s dip c7 1nf vs1 22uf cp6 22uf cp5 22uf cp4 22uf cp2 10uf cp1 cp8 470uf,100v cp7 470uf,100v l1 22uh r31 2.2k c13 0.1uf, 400v r30 10, 1w c12 0.47uf, 400v + - ch1 r8 100k 3 5 2 1 4 fet1 1 2 spkr1 r2 3.3k rca1 blue led1 ch_out c14 0.1uf r117 3.3k 1w r118 3.3k 1w -b +b d3 d4 r26 10k r27 10k -b d1 r3 100r sd fig 25 system-level vi ew of iraudamp7d self-oscillating frequency self-oscillating frequency is determined by the total delay time along the control loop of the system; the propagation delay of the irs2092, t he mosfets switching speed, the time-constant of front-end integrator (r7, r8, r11, c4, c6, c7). variations in +b and ?b supply voltages also affect the self-oscillating frequency. the self-oscillating frequency changes with the duty ratio. the frequency is highest at idling. it drops as duty cycle varies away from 50%. adjustments of self-oscillating frequency use r11 to set different self-oscillating frequencies. the pwm switching frequency in this type of self-oscillating switching scheme greatly impacts the audio performance, both in absolute
www.irf.com page 22 of 41 iraudamp7d rev 2.9 frequency and frequency relative to the other channels. in the absolute terms, at higher frequencies distortion due to switching-time becomes significant, while at lower frequencies, the bandwidth of the amplifier suffers. in relative terms, interference between channels is most significant if the relative frequency difference is within the audible range. normally, when adjusting the self-oscillating frequency of the different channels, it is suggested to either match the frequencies accurately, or have them separated by at least 25khz. under the normal operating condition with no audio input signal, the switching-frequency is set around 400khz in the iraudamp7d . selectable dead-time the dead-time of the irs2092 is set based on the voltage applied to the dt pin. fig 26 lists the suggested component value for each programmable dead-time between 25 and 105 ns. all the iraudamp7d models use dt2 (45ns) dead-time. dead-time mode r1 r2 dt/sd voltage dt1 <10k open vcc dt2 5.6k ? 4.7k ? 0.46 x vcc dt3 8.2k ? 3.3k ? 0.29 x vcc dt4 open <10k com recommended resistor values for dead time selection vcc 0.57 xvcc 0.36 xvcc 0.23 xvcc 105ns 75ns 45ns 25ns v dt dead- time vcc com dt >0.5ma r1 r2 irs2092(s) fig 26 dead-time settings vs. v dt voltage protection system overview the irs2092 integrates over current protection (ocp ) inside the ic. the rest of the protections, such as over-voltage protection (ovp), under-voltage protection (uvp), speaker dc offset
www.irf.com page 23 of 41 iraudamp7d rev 2.9 protection (dcp) and over temperature protection (o tp), are realized externally to the irs2092 (fig 27). in the event that any of these external fault cond itions are detected, the external shutdown circuit will disable the output by pulling down csd pins, turning on red leds, and turning off blue leds (fig 28). if the fault condition persists, the prot ection circuit stays in shutdown until the fault is removed. once the fault is cleared, the blue leds turn on and red leds turn off. q100 2n3904 ch1 _ o ut ch2 _ o ut -vss1 330uf, 10v cp100 z100 *68v +b -vss1 r112 47k sd dcp ovp uvp otp r103 715r q101 2n3906 th100 is thermally connected with heat sink -vss1 -vss1 +b th1 0 0 2.2k 1 2 3 5 4 6 s1 sw dpdt r104 4.7k r101 4.7k r102 10k c100 0.1uf r113 10k r107 10k r105 10k r1 1 1 10k r108 100k r109 100k r110 100k z101 *39v q104 2n3904 q102 2n3906 q103 2n3906 jw3 r106 10k fig 27 dcp, otp, uvp and ovp protection circuits . . . +vaa ocref ocref 5.1v csd ocset + . lo vs vcc vb csh r19 led1 blue d4 bav19 lp filter prot red cp3 r12 ho ocset com -vss csd 1.2v r18 +b r13 r17 -b fet1 fet2 fig 28 simplified functional diagram of ocp and associated led indicators
www.irf.com page 24 of 41 iraudamp7d rev 2.9 over-current protection (ocp) low-side current sensing the low-side current sensing feature protects the low side mosfet from an overload condition in negative load current by measuring drain-to-source voltage across r ds(on) during its on state. ocp shuts down the switching operation if the drain-to-source voltage exceeds a preset trip level. the voltage setting on the ocset pin programs the thres hold for low-side over-cur rent sensing. when the vs voltage during low-side conduction gets higher t han the ocset voltage, the irs2092 turns off outputs and pulls csd down to -vss. high-side current sensing the high-side current sensing protects the hi gh side mosfet from an overload condition in positive load current by measuring drain-to-source voltage across r ds(on) during its on state. ocp shuts down the switching operation if the drain-to-source voltage exceeds a preset trip level. high-side over-current sensing monitors drain-to-source voltage of the high-side mosfet while it is in the on state through the csh and vs pins. the csh pin detects the drain voltage with reference to the vs pin, which is the source of the high-side mosfet. in contrast to the low-side current sensing, the threshold of csh pin to trigger oc protection is internally fixed at 1.2v. an external resistive divider r19, r18 and r17 are used to program a threshold as shown in fig 26. an external reverse blocking diode d4 is required to block high voltage feeding into the csh pin during low-side conduction. by subtracting a forward voltage drop of 0.6v at d4, the minimum threshold which can be set for the high-side is 0.6v across the drain-to-source. table 2 actual ocp table setting thresholds function device amp7-55 am p7-100 amp7-150 amp7-200 ocset r12a r12b 1.3k 3.9k 7.5k 5.2k tested ocp current 25 o c 23a 30a 23a csh r18a r18b 0.0 4.7k 9.6k 8.2k tested ocp current 25 o c 23a 29a 23a peak load current at rated power 6.0a 8.7a 12.2a 8.9a over-voltage protection (ovp) ovp is provided externally to the irs2092. o vp shuts down the amplifier if the bus voltage between gnd and +b exceeds 75v. the threshold is determined by a zener diode z100. ovp
www.irf.com page 25 of 41 iraudamp7d rev 2.9 protects the board from harmful excessive supply voltages, such as due to bus pumping at very low frequency continuous output in stereo mode. under-voltage protection (uvp) uvp is provided externally to the irs2092. uvp prevents unwanted audible noise output from unstable pwm operation during power up and down. uvp shuts down the amplifier if the bus voltage between gnd and +b falls below a voltage set by zener diode z101. speaker dc-voltage protection (dcp) dcp protects speakers against dc output current feeding to its voice coil. dc offset detection detects abnormal dc offset and shuts down pwm. if this abnormal condition is caused by a mosfet failure because one of the high-side or low-side mosfets short circuited and remained in the on state, the power supply needs to be cut off in order to protect the speakers. output dc offset greater than 4v triggers dcp. offset null (dc offset) adjustment the iraudamp7d requires no output-offset adjustment. dc offsets are tested to be less than 20 mv. over-temperature protection (otp) a ntc resistor, th100 in fig 25, is placed in close proximity to two dual mosfets on a heatsink to monitor heatsink temperature. if the heatsink temperature rises above 100 ? c, the otp shuts down both channels by pulling down csd pins of the irs2092. otp recovers once the temperature has cooled down. on-off switch off position of s1 forces the iraudamp7d to stay in shutdown mode by pulling down the csd pin. during the shutdown mode the output mosfets are kept off. click and pop noise reduction thanks to the click and pop elimination function built into the irs2092, iraudamp7d does not use any additional components for this function.
www.irf.com page 26 of 41 iraudamp7d rev 2.9 power supply requirements for convenience, the iraudamp7d has all the necessary housekeeping power supplies onboard and only requires a pair of symmetric power supplies. power supply voltage depends on the model and is shown in the power selection in table 1. house keeping power supply the internally-generated housekeeping power supplies include 5.6v for analog signal processing, and +12v supply (v cc ) referred to negative supply rail -b for mosfet gate drive. the vaa and vss supplying floating input section are fed from +b and -b power stage bus supplies via r117 and r118, respectively. gate driver section of irs2092 uses vcc to drive gates of mosfets. the v cc is referenced to ?b (negative power supply). d3 and cp6 form a bootstrap floating supply for the ho gate driver. bus pumping when the iraudamp7d is running in the stereo mode, bus pumping effect takes place with low frequency high output. since the energy flowing in the class d switching stage is bi-directional, there is a period where the class d amplifier feeds energy back to the power supply. the majority of the energy flowing back to the supply is from the energy stored in the inductor in the output lpf. usually, the power supply has no way to absorb the energy coming back from the load. consequently the bus voltage is pumped up, creating bus voltage fluctuations. following conditions make bus pumping worse: 1. lower output frequencies (bus-pumping duration is longer per half cycle) 2. higher power output voltage and/or lower load impedance (more energy transfers between supplies) 3. smaller bus capacitance (the same energy will cause a larger voltage increase) the ovp protects iraudamp7d from failure in case of excessive bus pumping. one of the easiest counter measures of bus pumping is to drive both of the channels in a stereo configuration out-of-phase so that one channel consumes the energy flow from the other and does not return it to the power supply. bus voltage detection monitors only +b supply, assuming the bus pumping on the supplies is symmetric in +b and -b supplies. there is no bus pumping effect in full bridge mode.
www.irf.com page 27 of 41 iraudamp7d rev 2.9 cyan: positive rail voltage (+b), green: s peaker output, pink: negative rail voltage (-b) fig 29 bus pumping in half bridge mode bridged configuration by selecting s300 to bridged position, the irauda mp7d realizes full bridge mode, also known as bridge-tied-load, or btl configuration. full br idge operation is achieved by feeding out-of-phase audio input signals to the two input channels as shown in the fig 30 below. in bridged mode, iraudamp7d receives audio input signal from channel a only. the on-board inverter feed out-of-phase signal to channel b. the speaker output must be connected between (+) of channel a and (+) of channel b in bridged mode. in bridged mode, nominal load impedance is 8 ? . (see power table in table 1) . r3 0 0 22k r302 100 c3 0 0 0.1uf r303 100 c3 0 1 0.1uf +vaa -vss 1 6 5 2 3 8 7 4 u300 tl0 7 2 cp r3 0 1 22k from ch a bridged steereo rca 2 rca 1 jw8 cp 1 b+ from ch b 1 2 3 5 4 6 s300 sw dpdt fig 30 bridged configuration (btl)
www.irf.com page 28 of 41 iraudamp7d rev 2.9 load impedance each channel is optimized for a 4 ? speaker load in half bridge and 8 ? load in full bridge. output filter selection since the output filter is not included in the control loop of the iraudamp7d, the control loop has no ability to compensate performance deterioration caused by the output filter. therefore, it is necessary to understand what characteristics ar e preferable when designing the output filter. 1) the dc resistance of the inductor should be minimized to 20 m ? or less. 2) the linearity of the output inductor and capacitor should be high with output current and voltage. fig 31 demonstrates thd performance difference with various inductors. fig 31 thd+n vs. output power with different kind of output inductors 0.0001 100 0.001 0.01 0.1 1 10 % 100m 200m 500m 1 2 5 10 20 50 100 200 w t t
www.irf.com page 29 of 41 iraudamp7d rev 2.9 input signal and gain setting a proper input signal is an analog signal ranging from 20hz to 20khz with up to 3 v rms amplitude with a source impedance of no more than 600 ? . input signal with frequencies from 30khz to 60khz may cause lc resonance in the output lpf, causing a large reactive current flowing through the switching stage, especially with greater than 8 ? load impedances, and the lc resonance can activate ocp. the iraudamp7d has an rc network called zobel network (r30 and c13) to damp the resonance and prevent peaking frequency response with light loading impedance. (fig 32) the zobel network is not thermally rated to handle continuous supersonic frequencies above 20khz. these supersonic input frequencies can be filtered out by adding r2 and c2 as shown on main schematic fig 33 and fig 34. this rc filter works also as an input rf filter to prevent potential radio frequency interferences. . . . . 0v 0v lp filter l1 c12 r30 c13 fig 32 output low pass filter and zobel network gain setting the ratio of resistors r8/r2 in fig 23 sets voltage gain. the iraudamp7d has no on board volume control. to change the voltage gain, change the input resistor term r2. changing r8 affects pwm control loop design and may result poor audio performance.
www.irf.com page 30 of 41 iraudamp7d rev 2.9 d1a r3a 100r r13a 10k r12a *7.5k r24a 20r r18a *9.1k c11a 0.1uf,100v r17a *47k +b -b sd vcc1 cp3a 10uf r11a *300r c4a 1nf r20a 4.7r c8a 150pf,250v lo 11 vs 13 ho 14 vcc 12 gnd 2 vaa 1 com 10 dt 9 ocse t 8 in- 3 comp 4 csd 5 vss 6 vre f 7 vb 15 csh 16 u1a irs2092pbf vs1 cp6a 22uf drawing by: m.rodriguez mrodrig5@irf.com r7a *3.01k 1% cp8a *470uf, 100v l1a 22uh cha, out r31a 2.2k c13a 0.1uf, 400v r30a 10, 1w c12a 0.47uf, 400v -b +b + - cha r8a *120k 1% feedback *irfi4019h-117p 3 5 2 1 4 fet1a 1 2 spkr1a rca1a z1a 15v r1a 100k blue led led1a ch1_out hs1 jw 1a z103a 5.6v r117a *3.3k 1w r114a *1k 1w 1 2 3 tip31c q105a -b +b 3 2 1 fet2a bs250p r14a 4.7k prot a red led rca1 d3a heat sink -b note: components values marked on red or * are according to power table r2 & c2 are rf filters, optional not e : iraudamp7-55, +b, -b are +/-25v with fet1 as irfi 4024h-117p iraudamp7- 100, +b,-b are +/-35v with fet1 as irfi4212h-117p iraudamp7- 150, +b,-b are +/-50v with fet1 as irfi4019h-117p iraudamp7- 200, +b,-b are +/-70v with fet1 as irfi4020h-117p d5a +vaa1 -vss1 r22a 10k r19a 10k r27a 10k r26a 10k r115a *15k r23a 10k r2a 330 z104a 5.6v d4a d6a z102a 15v iraudamp7 rev 2. 2 r28a 10r jw 2a r118a *3.3k 1w cp1a 22uf cp2a 22uf cp4a 22uf cp5a 22uf cp101a 22uf c9a open cp7a *470uf, 100v c14a 0.1uf,100v c2a 1nf c6a 1nf c7a 1nf c10a 0.1uf, 400v +b +b -b 1 2 3 conn1 22uh r25a 20r r29a open r21a 10r cha fig 33 amplifier schematic, channel 1 .
www.irf.com page 31 of 41 iraudamp7d rev 2.9 d1b r3b 100r r13b 10k r12b *7.5k r18b *9.1k c11b 0.1uf,100v r17b *47k +b -b sd vcc2 cp3b 10uf r11b *270r c4b 1nf r20b 4.7r c8b 150pf,250v lo 11 vs 13 ho 14 vcc 12 gnd 2 vaa 1 com 10 dt 9 ocset 8 in- 3 comp 4 csd 5 vss 6 vref 7 vb 15 csh 16 u1b irs2092pbf vs2 cp6b 22uf r7b *3.01k 1% cp8b *470uf, 100v l1 b 22uh ch2 out r31b 2.2k c13b 0.1uf, 400v r30b 10, 1w c12b 0.47uf, 400v -b +b + - ch1 r8b *100k 1% feedback *irfi4019h-117p 3 5 2 1 4 fet1b 1 2 spkr1b rca1b z1 b 15v r1b 100k blue led led1 b ch2 _out jw1b z1 0 3 b 5.6v r117b *3.3k 1w r114b *1k 1w 1 2 3 tip3 1 c q105b -b +b 3 2 1 fet2b bs250p r14b 4.7k prot b red led rca1 d3 b heat sink -b note: components values marked on red or * are according to power table r2 & c2 are rf filters, optional no te: iraudamp7-55, +b,-b are +/-25v with fet1 as irfi4024h-117p iraudamp7-100, +b,-b are +/-35v with fet1 as irfi4212h-117p iraudamp7-150, +b,-b are +/-50v with fet1 as irfi4019h-117p iraudamp7-200, +b,-b are +/-70v with fet1 as irfi4020h-117p d5b +vaa2 -vss2 r22b 10k r19b 10k r27b 10k r26b 10k r115b *10k r23b 10k r2b 330 z1 0 4 b 5.6v d4 b d6b z102b 15v jw2b r118b *3.3k 1w cp1b 22uf cp2b 22uf cp4b 22uf cp5b 22uf cp101b 22uf c9b open cp7b *470uf, 100v c14b 0.1uf,100v c2b 1nf c6b 1nf c7b 1nf c10b 0.1uf, 400v +b l2 22uh r24b 20r r25b 20r r28b 10r r29b open r21b 10r fig 34 amplifier schematic, channel 2 .
www.irf.com page 32 of 41 iraudamp7d rev 2.9 drawing by: m.rodriguez mrodrig5@irf.co m q100 2n3904 ch1_out ch2_out -vss1 330uf, 10v cp100 z100 *68v +b -vss1 r112 47k sd dcp ovp uvp otp r103 715r q101 2n3906 th100 is thermally connected with heat sink -vss1 -vss1 +b jw5 jw6 jw7 sd sd +b +b -b -b th100 2.2k jw20 jw21 v cc1 v cc2 v cc2 v cc2 note: components values marked on red or * are according to power table 1 2 3 5 4 6 s1 sw dpdt r104 4.7k r101 4.7k r102 10k c100 0.1uf r113 10k r107 10k r105 10k r111 10k r108 100k r109 100k r110 100k z101 *39v q104 2n3904 q102 2n3906 q103 2n3906 jw3 r106 10k fig 35 protection schematic . r300 22k +vaa2 -vss2 1 6 5 2 3 8 7 4 u300 tl071cp from cha, rca input bridged steereo rca2 rca1 cp1b+ drawing by: m.rodriguez mrodrig5@irf.co m from ch2, rca input 1 2 3 5 4 6 s300 sw dpdt r301 22k r302 100 r303 100 c300 0.1uf c301 0.1uf jw 8 jw 9 fig 36 bridge preamp schematic
www.irf.com page 33 of 41 iraudamp7d rev 2.9 IRAUDAMP7D-150 fabrication materials table 3 IRAUDAMP7D-150 electr ical bill of materials quantit y value description designator digikey p/n vendor 8 1nf, 50v cap 1nf 50v polyester 5% c2a, c2b, c4a, c4b, c6a, c6b, c7a, c7b p4551-nd panasonic - ecg 2 150 pf, 250v ceramic cap 150pf 250 vac ceramic 10 % c8a, c8b p11413tb-nd panasonic - ecg 2 open ceramic cap 150pf 250 vac ceramic 10% c9a, c9b p11413tb-nd panasonic - ecg 4 0.1uf, 400v cap .10uf 400v metal polypropylane c10a, c10b, c13a, c13b 495-1311-nd epcos inc 4 0.1uf 100v cap .10uf 100v metal polyester c11a, c11b, c14a, c14b 495-1147-nd epcos inc 2 0.47uf, 400v cap .47uf 400v metal polypropylane c12a, c12b 495-1315-nd epcos inc 3 0.1uf 100v cap .10uf 100v metal polyester c100, c300, c301 495-1147-nd epcos inc 1 ed365/3 terminal block 7.50mm 3pos pcb conn1 ed2355-nd on shore technology 12 22uf cap 22uf 25v elect vr radial cp1a, cp1b, cp2a, cp2b, cp4a, cp4b, cp5a, cp5b, cp6a, cp6b, cp101a, cp101b 493-1058-nd nichicon 2 10uf, 16v cap elect 10uf 16v ks radial cp3a, cp3b p966-nd panasonic - ecg 4 470uf/100v cap 470uf 100v elect pw radial cp7a, cp7b, cp8a, cp8b 493-1985-nd nichicon 1 330uf, 10v cap 330uf 10v alum lytic radial cp100 p5125-nd panasonic - ecg 2 1n4148t-73 diode switch 100v 150ma do-35 d1a, d1b 1n4148t-73ct-nd rohm 4 mur120rlg diode ultra fast 1a 200v axial do-41 d3a, d3b, d4a, d4b mur120rlgosct -nd on semiconducto r 4 1n4003 diode gen purpose 200v 1a do41 d5a, d5b, d6a, d6b 1n4003fsct-nd fairchild semiconducto r 2 *irfi4019h- 117p irfi4019h-117p, dual mosfet to-220-5 fet1a, fet1b ir's part no. international rectifier 2 bs250p mosfet p-ch 45v 230ma to-92 fet2a, fet2b bs250p-nd zetex inc 1 heat sink aluminum heat spreader hs1 drawing irhs_amp1 custom made 4 wire 0.400" axial jumper res 0.0 ohm jw1a, jw1b, jw2a, jw2b p0.0bact-nd panasonic - ecg 1 wire 0.300" axial jumper res 0.0 ohm jw3 p0.0bact-nd panasonic - ecg 1 wire 1.640" wire jumper #20 awg insulated jw5 custom custom 2 wire 1.800" wire jumper #20 awg insulated jw6, jw7 custom custom 1 wire 1.240" wire jumper #20 awg insulated jw8 custom custom 1 wire 1.200" wire jumper #20 awg insulated jw9 custom custom 2 wire 0.800" wire jumper #20 awg insulated jw20, jw21 custom custom 2 22uh, 13a class d inductor, 22uh l1a, l1b sagami 7g17a- sagami
www.irf.com page 34 of 41 iraudamp7d rev 2.9 13a 220m-r 2 blue led led 3mm dual flange blue clear led1a, led1b 160-1600-nd lite-on inc 2 red led led 3mm hi-eff red transparent prot a, prot b 160-1140-nd lite-on inc 2 2n3904-ap transistor npn gp 40v to92 q100, q104 2n3904-apct-nd micro commercial co. 3 2n3906-ap transistor pnp gp 40v to92 q101, q102, q103 2n3906-apct-nd micro commercial co. 2 tip31c trans npn epitax 100v 3a to-220 q105a, q105b tip31cfs-nd fairchild semiconducto r 4 100k res 100k ohm carbon film 1/4w 5% r1a, r1b, r108, r110 p100kbact-nd panasonic - ecg 2 330 axial res 330 ohm carbon film 1/4w 5% r2a, r2b p330bact-nd panasonic - ecg 2 100 ohms axial res 100 ohm carbon film 1/4w 5% r3a, r3b p100bact-nd panasonic - ecg 2 3k 1% axial res metal film 3.00k ohm 1/4w 1% r7a, r7b p3.00kcact-nd panasonic - ecg 2 120k 1% axial res metal film 120k ohm 1/4w 1% r8a, r8b p120kcact-nd panasonic - ecg 2 300 ohms axial res 300 ohm carbon film 1/4w 5% r11a, r11b p300bact-nd p300bact- nd 2 7.5k axial res 7.5k ohm carbon film 1/4w 5% r12a, r12b p7.5kbact-nd yageo 18 10k axial res 10k ohm carbon film 1/4w 5% r13a, r13b, r19a, r19b, r22a, r22b, r23a, r23b, r26a, r26b, r27a, r27b, r102, r105, r106, r107, r111, r113 p10kbact-nd panasonic - ecg 4 4.7k axial res 4.7k ohm carbon film 1/4w 5% r14a, r14b, r101, r104 p4.7kbact-nd panasonic - ecg 2 47k axial res 47k ohm carbon film 1/4w 5% r17a, r17b p47kbact-nd panasonic - ecg 2 9.1k axial res 9.1k ohm carbon film 1/4w 5% r18a, r18b p9.1kbact-nd panasonic - ecg 2 4.7 ohms axial res 4.7 ohm carbon film 1/4w 5% r20a, r20b p4.7bact-nd panasonic - ecg 4 10 ohms axial res metal film 10.0 ohm 1/2w 1% r21a, r21b, r28a, r28b ppc10.0xct-nd vishay/bc components 4 20r axial res metal film 20.0 ohm 1/2w 1% r24a, r24b, r25a, r25b ppc20.0xct-nd vishay/bc components 2 open axial res metal film 10.0 ohm 1/2w 1% r29a, r29b ppc10.0xct-nd vishay/bc components 2 2.2k 1w axial res 10 ohm 1w 5% metal oxide r30a, r30b 10w-1-nd yageo 2 2.2k 1w axial res 2.2k ohm 1w 5% metal oxide r31a, r31b 2.2kw-1-nd yageo 1 715 1% axial res 715 ohm 1% 50ppm 1/4w r103 cmf715qfct-nd vishay/dale
www.irf.com page 35 of 41 iraudamp7d rev 2.9 1 100k res 100k ohm carbon film 1/4w 5% r109 p100kbact-nd panasonic - ecg 1 47k axial res 47k ohm carbon film 1/4w 5% r112 p47kbact-nd panasonic - ecg 2 1k 1w axial res 1.0k ohm 1w 5% metal oxide r114a, r114b 1.0kw-1-nd yageo 2 15k axial res 15k ohm carbon film 1/4w 5% r115a, r115b p15kbact-nd panasonic - ecg 4 3.3k 1w axial res 3.3k ohm 1w 5% metal oxide r117a, r117b, r118a, r118b 3.3kw-1-nd yageo 2 22k axial res 22k ohm carbon film 1/4w 5% r300, r301 p22kbact-nd panasonic - ecg 2 100 ohms axial res 100 ohm carbon film 1/4w 5% r302, r303 p100bact-nd panasonic - ecg 1 rcj-013 (white ch2) conn rca jack metal r/a wht pcb rca1a cp-1402-nd (white) cui inc 1 rcj-012 (red ch1) conn rca jack metal r/a wht pcb rca1b cp-1401-nd (red) cui inc 2 eg2209a switch slide dpdt 12v .1a l=4 s1, s300 eg1908-nd e-switch 2 ed365/2 terminal block 7.50mm 2pos pcb spkr1a, spkr1b ed2354-nd on shore technology 1 2.2k at 25c thermistor ntc 2.2k ohm leaded th100 bc2304-nd vishay/bc components 2 irs2092pbf class d controller, irs2092pbf dip-16, class d controller, irs2092pbfdip-16 u1a, u1b ir's p/n international rectifier 1 tl071cp ic ln jfet-in gp op amp 8-dip u300 296-7186-5-nd texas instruments 4 15v diode zener 500mw 15v do35 z1a, z1b, z102a, z102b 1n5245b-tpct- nd micro commercial co. 1 68v diode zener 500mw 68v do35 z100 1n5266b-tpct- nd micro commercial co. 1 39v diode zener 500mw 39v do35 z101 1n5259bdict-nd micro commercial co. 4 5.6v diode zener 500mw 5.6v do35 z103a, z103b, z104a, z104b 1n5232b-tpct- nd micro commercial co. note all ? w and 1w resistors are flame proof part numbers table 4 iraudamp7d mechani cal bill of materials quantit y value description designator digikey p/n vendor 1 16-dip socket 16 pin solder tail dip socket ic socket 1 a402ae -nd aries electro- nics 5 washer #4 ss washer lock internal #4 ss lock washer 1, lock washer 2, lock washer 3, lock washer 4, lock washer 5 h729- nd building fasteners 1 pcb print circuit board iraudamp7d_rev 2.2 .pcb pcb 1 custom 12 screw 4- 40x5/16 screw machine phillips 4-40x5/16 screw 1, screw 2, screw 3, screw 4, screw 5, screw 6, screw 7, screw 8, screw 9, screw 10, screw 11, screw 12 h343- nd building fasteners
www.irf.com page 36 of 41 iraudamp7d rev 2.9 4 stand off 0.5" standoff hex 4- 40thr .500"l alum stand off 1, stand off 2, stand off 3, stand off 4 1893k- nd keystone electro- nics 1 stand off 0.5" standoff hex m/f 4- 40 .500" alum, chassis gnd stand off 5 8401k- nd keystone electro- nics 1 aavid 4880g thermalloy to-220 mounting kit with screw to-220 mounting kit 1 newuar k 82k609 6 therm- alloy table 5 iraudamp7d mode ls differential table model name item amp7d-55 amp7d-100 amp7d-150 amp7d-200 notes ir power mosfets fet1 irfi4024h-117p irfi4212h-117p irfi4019h-117p irfi4020h- 117p 8 ? 25 w x 2 60 w x 2 125 w x 2 250 w x 2 stereo half bridge output 4 ? 50 w x 2 120 w x 2 250 w x 2 n/a stereo full bridge output 8 ? 100 w x 1 240 w x 1 500 w x 1 n/a bridged +b, -b 25 v 35 v 50 v 70 v power supply b voltage range 3 v 5 v 8 v 10 v audio gain gain 20 30 36 40 feedback r8a,r8b 68k 100k 120k 130 k +vaa r117a* r117b* 1 k, 1 w 2.2 k, 1 w 3.3 k, 1 w 5.1 k, 1 w -vss r118a* r118b* 1 k, 1 w 2.2 k, 1 w 3.3 k, 1 w 5.1 k, 1 w r114a* r114b* 100,1 w 220, 1 w 1 k, 1 w 2.2 k 1 w vcc r115a r115b 4.7 k 10 k 15 k 20 k ocset r12a r12b 1.3 k (20 a) 3.9 k (23 a) 7.5 k (30 a) 5.1 k (23 a) (trip level) csh r18a r18b 0.0 (20a) 4.7 k (23a) 9.1 k (29a) 8.2 k (23 a) (trip level) oscillation frequency r11a r11b 270 270 300 360 400khz vb r17a r17b 20 k 33 k 47 k 75k ovp z100 24 v 1n5252bdict- nd 47 v 1n5261bdict- nd 68 v 1n5266b-tpct- nd 91 v 1n5270b- tpct-nd zener digikey p/n uvp z101 12 v 1n5242b-tpct- nd 30 v 1n5256bdict- nd 39 v 1n5259bdict- nd 51 v 1n5262b- tpct-nd zener digikey p/n clamping diode d5a d5b d6a d6b in4002 in4002 in4002 n/a * marked components are axial, 5 %, ? w, and flame proof type.
www.irf.com page 37 of 41 iraudamp7d rev 2.9 iraudamp7d hardware screw lock washers h729-nd dual fet to-220-5 pcb lock washer screws h343-nd heatsink threaded heatsink threaded heat sink screw lock washer put silicone grease between the heat spreader and to-220-5 flat washer #4 fig 37 dual mosfet mounting screw lock washer pcb screw to-220 pad insulator lock washer heatsink threaded heatsink threaded heat sink screws h343-nd to-220 flat washer #4 shoulder washer lock washers h729-nd fig 38 +vcc regulator to-220 mounting
www.irf.com page 38 of 41 iraudamp7d rev 2.9 fig 39 heat spreader . screw screw h343-nd screws h343-nd stand off 3 1893k-nd stand off 5 8401k-nd screw stand off 4 1893k-nd lock washers h729-nd lock washer lock washer incert thermistor into this hole and put silicone grease stand off 1 1893k-nd stand off 2 1893k-nd lock washer screw h343-nd lock washer screw h343-nd lock washer gnd standoff screw h343-nd lock washer fig 40 hardware assemblies
www.irf.com page 39 of 41 iraudamp7d rev 2.9 iraudamp7d pcb specifications pcb: 1. single layers smt pcb with through holes 2. 1/16 thickness 3. 2/0 oz cu 4. fr4 material 5. 10 mil lines and spaces 6. solder mask to be green enamel emp110 dbg (carapace) or enthone endplate dsr-3241or equivalent. 7. top silk screen to be white epoxy non conductive per ipc?rb 276 standard. 8. all exposed copper must finished with tin-lead sn 60 or 63 for 100u inches thick. 9. tolerance of pcb size shall be 0.010 ?0.000 inches 10. tolerance of all holes is -.000 + 0.003? 11. pcb acceptance criteria as defined for class ii pcb?s standards. gerber files apertures description: all gerber files stored in the attached cd-rom were generated from protel altium designer altium designer 6. each file name extension means the following: 1. .gbl bottom copper, bottom side 2. .gto top silk screen 3. .gbs bottom solder mask 4. .gko keep out, 5. .gm1 mechanical 6. .gd1 drill drawing 7. .gg1 drill locations 8. .txt cnc data 9. .apr apertures data additional files for assembly that may not be related with gerber files: 10. .pcb pcb file 11. .bom bill of materials 12. .cpl components locations 13. .sch schematic 14. .csv pick and place components 15. .net net list 16. .bak back up files 17. .lib pcb libraries
www.irf.com page 40 of 41 iraudamp7d rev 2.9 fig 41 iraudamp7d pcb top overlay (top view) fig 42 iraudamp7d pcb bottom layer (top view)
www.irf.com page 41 of 41 iraudamp7d rev 2.9 revision changes descriptions revision changes description date rev 2.8 released september, 03 2008 rev 2.9 bom append r21b; schematic: ch2 r21a ? r21b october,24,2013 world headquarters: 233 kansas st., el segundo, calif ornia 90245 tel: (310) 252-7105 data and specifications subject to change without notice. 09/03/2008

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