40109 ms jk 20090313-s00003 no.5715-1/8 http://onsemi.com semiconductor components industries, llc, 2013 may, 2013 la4725 overview the la4725 is a 2-channel btl audio power amplifier ic for car audio. it was designed for the best possible audio quality and features an extended low band roll-off frequency provided by a newly-developed nf circuit that does not require an external capacitor. furthermore, crosstalk, which can cause muddiness in the audio output, has been significantly reduced by both circuit and wiring pattern improvements. thus this amplifier can provide powerful lows and clear highs. features ? total output (eiaj power): 30w + 30w (at v cc = 14.4v, r l = 4 , thd = 30%) ? high-fidelity design (f l < 10hz, f h = 130khz) ? extremely low impulse noise levels ? an arbitrary amplifier startup time can be set up with external components ? built-in standby switch circuit ? full complement of built-in protection circuits (includes circuits that protect against shorting to v cc , shorting to ground, load shorting, over-voltages and excessive temperatures) specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max no signal 18 v surge supply voltage v cc surge t 0.2s, giant pulse one-shot 50 v maximum output current i o peak per channel 3.0 a allowable power dissipation pd max with a infinite heat sink 32 w operating temperature topr -35 to +85 c storage temperature tstg -40 to +150 c orderin g number : EN5715A orderin g numbe r : EN5715A monolithic linear ic 2-channel 30w btl audio amplifier stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
la4725 no.5715-2/8 operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc 13.2 v allowable operating supply voltage v cc op 9 to 16 v recommended load resistance r l 4 note : with v cc , r l , and the output level in ranges such that th e pd max for the heat sink used is not exceeded. electrical characteristics at ta = 25c, v cc = 13.2v, r l = 4 , f = 1khz, rg = 600 parameter symbol conditions ratings unit min typ max quiescent current i cco rg = 0 70 125 250 ma standby mode current drain i st standby mode (amplifier off), with no power supply capacitor. 10 60 a voltage gain v g v o = 0dbm 38 40 42 db total harmonic distortion thd p o = 2w 0.06 0.2 % output power p o 1 thd = 10% 13 17 w p o 2 thd = 10%, v cc = 14.4v 20 w p o 3 thd = 30%, v cc = 14.4v 30 w output offset voltage v n offset rg = 0 -300 +300 mv output noise voltage v no rg = 0, bpf = 20hz to 20khz 0.1 0.5 mv ripple rejection ratio svrr rg = 0, v r = 0dbm, f r = 100hz 40 50 db channel separation chsep rg = 10k , v o = 0dbm 50 60 db input resistance ri 21 30 39 k standby pin applied voltage v st amplifier on (applied through an external 10k resistor) 2.5 v cc v package dimensions unit : mm (typ) 3113b sanyo : sip14hz 7.0 4 . 6 7.8 5.2 14 1 26.8 (20.0) 0.8 1.6 2.2 4.0 (8.4) (r1.7) 0.5 0.4 (1.83) 1.78 heat spreader (11.8) 14.5max 0 pd max -- ta -40 35 25 30 15 20 10 5 20 0 40 60 80 100 120 140 160 f = 3 c/w f = 4 c/w f = 7 c/w jc = 2 c/w ? fin f = 10 c/w 32.5 20.83 13.9 10.4 3.1 infinite heat sink allowable power dissipation, pd max -- w ambient temperature, ta -- c ai heat sink mounting torque 39n ? cm flat washer silicone grease applied -20
la4725 no.5715-3/8 block diagram 0.1 f 0.1 f r4 c9** c8** r5 2.2 2.2 r l 4 r l 4 -out2 +out2 ? + off ripple filter + bias circuit standby sw pop noise prevention circuit predriver predriver power power load short protector output pin to v cc short protector output pin to v cc short protector output pin to gnd short protector output pin to gnd short protector predriver predriver power power over voltage / surge protector thermal shut down load short protector v cc + + on r1 10k +5v c4 2.2 f 25v 33 f 25v 0.47 f 25v 2.2 f 25v c1 100 f/25v v cc c5 2200 f 25v + -out1 +out1 ? + power gnd2 + + c3 c10 ** (polyester film capacitor) + ? in c2 pre gnd in2 power gnd1 14 2 1 3 4 6 7 5 11 12 13 0.1 f 0.1 f r2 c7** c6** r3 2.2 2.2 9 10 8 + ? in c3 sets the amplifier starting time (approximately 0.6 seconds when 33f) c10 impulse noise reduction (note : the device?s ability to withstand shorting to v cc or shorting to ground when v cc is around 16v may be reduced as the value of this capacitor is increased. we recommend 0.47f.)
la4725 no.6631-4/8 pin voltages v cc = 13.2v, with 5v applied to stby through a 10k resistor, r l = 4 , rg = 0 pin no. 1 2 3 4 5 6 7 pin name in1 dc pre-gnd stby on time in2 pop pin voltage 1.53v 5.65v 0v 3.25v 2.32v 1.53v 2.14v pin no. 8 9 10 11 12 13 14 pin name + out2 ? out2 pwr-gn + out1 pwr-gn ? out1 v cc pin voltage 5.70v 5.70v 0v 5.70v 0v 5.70v 13.2v external components c1 and c4: input capacitors. a value of 2.2 f is recommended. determine the polarity based on the dc potential of the circuit connected directly to the la4725 front end. note that the low band response can be adjusted by varying f l with the capacitors c1 and c4. c2 : decoupling capacitor (ripple filter) c3 : sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33 f. the starting time is proportional to the value of this capacitor, and can be set to any desired value. c5 : power-supply capacitor c6, c7, c8, and c9 : oscillation prevention capacitors. use polyester film capacitors (mylar capacitors) with excellent characteristics. (note that the series resistors r2, r3, r4, and r5 are used in conjunction with these capacitors to achieve stable ampl ifier operation.) a value of 0.1 f is recommended. c10 : impulse noise reduction capacitor. a value of 0.47 f is recommended. caution is required when selecting the value for this capacitor, since increasing its value influences the operation of the circuits that protect against shorting the amplifier output pins to v cc or to ground when higher v cc voltages (approximately 16v or higher) are used. r1 : standby switch current limiting resistor. a value of 10k is recommended when a voltage in the range 2.5 to 12v will be applied as the standby switching voltage. note that this resistor is not optional: it must be included. ic internal characteristics and notes 1. standby function ? pin 4 is the standby switch. a voltage of 2.5v or higher must be applied through an external resistor to turn the amplifier on. ? if a voltage of over 12v will be applied as the standby mode switching voltage, use the following formula to determine the value of r1 so that the current entering at pin 4 remains under 500 a. r1 = < applied voltage > ? 1.4 ? 10k 500 2. muting function ? pin 5 connects the capacitor that determines the starting tim e to prevent impulse noise. it can also be used to mute the amplifier output by shorting pin 5 to ground. when this function is used, the recovery time depends on c3. 3. impulse noise improvements ? while the la4725 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off (and when switching into or out of standby mode) a 0.47 f capacitor may be inserted between pin 7 and the pre gnd pin (pin 3). (pin 7 is the output amplifier bias pin. since the ability to withstand shorting the output pins to v cc or ground is reduced for supply voltages over 16v if the pin 7 capacitance is large, we recommend a value of 0.47 f or lower for this capacitor.) 4 r1 10k 500 a or lower about 1.4v (2v be ) pin 4 internal equivalent circuit applied standby voltage
la4725 no.6631-5/8 4. protection circuits ? due to the system structure of the protection circuit for shorts to v cc or ground, if there is a dc resistance between the amplifier output pins and ground, the protec tion circuit may operate when power is first applied and the amplifier may fail to turn on. the basic design approach we recommend is not to adopt any designs in which there is a dc resistance between the amplifier outputs and ground. ? the la4725 includes a built-in thermal protection circuit to prevent the ic from being damaged or destroyed if abnormally high temperatures occur. this thermal protec tion circuit gradually reduces the output if the ic junction temperature (tj) r eaches the range 170 to 180 c due to inadequate heat sinking or other problem. if the temperature falls, the amplifier will restart automatically. ? the la4725 also includes other protection circuits. use of these circuits also requires care during end product design and testing. 5. other notes ? the la4725 is a btl power amplifier. when testing this device, the ground systems for the test equipment connected to ic inputs, and that for the test equipment connected to ic outputs, must be isolated. do not use a common ground. printed circuit pattern (copper foil side) + + gnd gnd gnd c5 c1 + c2 + + + c4 c10 c3 stb in1 in2 14 1 la4625/la4725 r2 r1 c6 -out1 r3 c7 +out1 r4 c8 -out2 r5 c9 +out2 v cc
la4725 no.6631-6/8 p o -- v cc output power, p o -- w supply voltage, v cc -- v output power, p o -- w total harmonic distortion, thd -- % frequency, f -- hz total harmonic distortion, thd -- % output noise voltage, v no -- mvrms input voltage, v in -- mvrms output power, p o -- w frequency, f -- hz output power, p o -- w frequency, f -- hz response -- db frequency, f -- hz channel separation, chsep -- db 6 0 5 10 15 25 40 7 8 9 101112131415161718 thd = 30% f = 1khz rg = 600 r l = 4 20 30 35 thd = 10% p o -- v in 23 57 0.01 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1.0 10 23 57 100 23 57 1k v cc = 13.2v r l = 4 f = 1khz thd = 10% thd = 3% thd = 1% p o -- f 23 57 0 4 8 12 16 20 24 10 100 23 57 1k 23 57 10k 23 57 100k v cc = 13.2v r l = 4 rg = 600 f response 23 57 -10 -8 -6 -4 -2 0 2 10 100 23 57 1k 23 57 10k 23 57 100k v cc = 13.2v r l = 4 rg = 600 v o = 0dbm (f = 1khz) 10khz 100hz f = 1khz thd -- p o 2 0.1 0.01 3 2 7 5 1.0 3 2 7 5 10 3 2 7 5 35 1.0 0.1 7235 10 7235 100 7 v cc = 13.2v r l = 4 rg = 600 din audio thd -- f 2 0.1 0.01 3 2 7 5 1.0 3 2 7 5 10 3 2 7 5 35 100 10 7235 1k 7235 10k 7235 100k 7 v cc = 13.2v r l = 4 p o = 1w nonfilter chsep -- f -80 -70 -60 -50 -40 -30 -20 23 7 5 100 10 23 7 5 1k 23 7 5 10k 23 7 5 100k ch1 2 ch2 1 v cc = 13.2v r l = 4 rg = 10k v o = 0dbm nonfilter v no -- v cc 120 60 70 80 90 100 110 8 1012141618 rg = 0 r l = 4 supply voltage, v cc -- v
la4725 no.6631-7/8 v n -- v c3 -- f amp on time -- s ripple rejection ratio, svrr -- db supply voltage, v cc -- v ripple frequency, f r -- hz ripple rejection ratio, svrr -- db supply voltage, v cc -- v quiescent current, i cco -- ma output power, p o -- w power dissipation, pd -- w ripple rejection ratio, svrr -- db power supply ripple, v ccr -- vrms supply voltage, v cc -- v svrr -- v cc 6 -80 -70 -60 -50 -40 -30 -20 810 12141618 out2 out1 r l = 4 rg = 0 f r = 100hz v ccr = 0dbm din audio v o v ccr svrr -- v ccr 0 -100 -80 -60 -40 -20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 v cc = 13.2v r l = 4 rg = 0 nonfilter svrr = 20log 100hz out2 3khz out2 3khz out1 100hz out1 out1 out2 svrr -- f r 23 57 -100 -80 -60 -40 -20 0 10 100 23 57 1k 23 57 10k 23 57 100k v cc = 13.2v r l = 4 rg = 0 v ccr = 0dbm nonfilter i cco -- v cc 6 8 10 12 14 16 18 20 22 36 40 60 80 100 120 140 160 r l = 4 rg = 0 36 36 36 v n -- v cc 51015202530 0 2 4 6 8 10 12 r l = 4 rg = 0 pd -- p o 2 10 0 25 35 1.0 0.1 7235 10 7235 100 7 r l = 4 rg = 600 f = 1khz 15 20 5 v cc = 14.4v v cc = 13.2v amp on time 0 0.1 0.2 0.3 0.4 0.6 23 57 1.0 10 23 57 100 v cc = 13.2v v st = 5v 0.5
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