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? semiconductor components industries, llc, 2009 january, 2009 ? rev. 3 1 publication order number: ncp3066/d ncp3066, NCV3066 up to 1.5 a constant current switching regulator for leds with on/off function the ncp3066 is a monolithic switching regulator designed to deliver constant current for powering high brightness leds. the device has a very low feedback voltage of 235 mv (nominal) which is used to regulate the average current of the led string. in addition, the ncp3066 has a wide input voltage up to 40 v to allow it to operate from a 12 vac or a 12 ? 36 vdc supply, commonly used for lighting applications as well as unregulated supplies such as rechargeable batteries. the ncp3066 switching regulator can be configured in step ? down (buck), step ? up (boost) and voltage ? inverting topologies with a minimum number of external components. the on/off pin provides pwm dimming capability or a low power shutdown mode. features ? integrated 1.5 a switch ? input voltage range from 3.0 v to 40 v ? logic level shutdown capability ? low feedback voltage of 235 mv ? cycle ? by ? cycle current limit ? no control loop compensation required ? frequency of operation adjustable up to 250 khz ? analog and digital pwm dimming capability ? internal thermal shutdown with hysteresis ? ncv prefix for automotive and other applications requiring site and control changes ? these are pb ? free devices applications ? automotive and marine lighting ? constant current source, high brightness led driver ? low voltage and landscape lighting ? ? ? ? ? ? ? ? on/off ipk comp swc swe ct gnd ?? ?? ?? ?? ?? ?? ?? ?? ? led+ l 1 r sense d 1 ncp3066 c out led 1 led n figure 1. typical buck application circuit r s pdip ? 8 p, p1 suffix case 626 http://onsemi.com marking diagrams dfn8 mn suffix case 488af soic ? 8 d suffix case 751 1 8 ncp3066 awl yywwg ncp3066 = specific device code a = assembly location l, wl = wafer lot y, yy = year w, ww = work week g or = pb ? free package (note: microdot may be in either location) see detailed ordering and shipping information in the package dimensions sect ion on page 17 of this data sheet. ordering information alyw 1 1 8 3066 alyw 3066 1
ncp3066, NCV3066 http://onsemi.com 2 figure 2. pin connections timing capacitor comparator inverting input v cc on/off i pk sense gnd switch emitter switch collector (top view) 4 3 2 1 5 6 7 8 ? ? ? ? ?? ?? ?? ?? figure 3. pin connections note: ep flag must be tied to gnd pin 4 on pcb ep flag soic ? 8/pdip ? 8 dfn8 figure 4. block diagram 5 r s q + ? 7 comparator ct 3 8 tsd 0.2 v + ? 2 6 r s q 4 1 switch collector switch emitter timing capacitor gnd comparator inverting input v cc i pk sense on/off oscillator 0.235v reference regulator on/off bias comparator pin description pin no. pin name description pdip8 dfn8 1 1 switch collector internal darlington switch collector. 2 2 switch emitter internal darlington switch emitter. 3 3 timing capacitor timing capacitor to control the switching frequency. 4 4, ep flag gnd ground pin for all internal circuits. 5 5 comparator inverting input inverting input pin of internal comparator. 6 6 v cc voltage supply 7 7 i pk sense peak current sense input to monitor the voltage drop across an external resistor to limit the peak current through the circuit. 8 8 on/off on/off pin. to disable the device, this input should be pulled below 0.8 v. if the pin is left floating, it will be disabled.
ncp3066, NCV3066 http://onsemi.com 3 maximum ratings (measured vs. pin 4, unless otherwise noted) rating symbol value unit vcc pin 6 v cc 0 to +42 v comparator inverting input pin 5 v cii ? 0.3 to + v cc v darlington switch collector pin 1 v swc ? 0.3 to + 42 v darlington switch emitter pin 2 (transistor off) v swe ? 0.6 to + v cc v darlington switch collector to emitter pins 1 ? 2 v swce ? 0.3 to + 42 v darlington switch current i sw 1.5 a i pk sense pin 7 v ipk ? 0.3 to v cc + 0.3 v timing capacitor pin voltage (pin 3) v tc ? 0.2 to +1.4 v moisture sensitivity level msl 1 ? lead temperature soldering t sld 260 c on/off pin voltage v on/off ( ? 0.3 to +25) < v cc v power dissipation and thermal characteristics pdip ? 8 (note 5) thermal resistance junction ? to ? air r ja 100 c/w soic ? 8 (note 5) thermal resistance junction ? to ? air r ja 180 c/w dfn ? 8 (note 5) thermal resistance junction ? to ? air thermal resistance junction ? to ? case r ja r jc 78 14 c/w storage temperature range t stg ? 65 to +150 c maximum junction temperature t jmax +150 c operating junction temperature range (note 3) ncp3066 NCV3066 t j 0 to +85 ? 40 to +125 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. 1. this device series contains esd protection and exceeds the following tests: pin 1 ? 8: human body model 2000 v per aec q100 ? 002; 003 or jesd22/a114; a115 machine model method 200 v 2. this device contains latch ? up protection and exceeds 100 ma per jedec standard jesd78. 3. the relation between junction temperature, ambient temperature and total power dissipated in ic is t j = t a + r ? p d . 4. the pins which are not defined may not be loaded by external signals. 5. 35 m copper, 10 cm 2 copper area.
ncp3066, NCV3066 http://onsemi.com 4 electrical characteristics (v cc = 5.0 v, ? 40 c < t j < +125 c for NCV3066, 0 c < t j < +85 c for ncp3066 unless otherwise specified) symbol characteristic conditions min typ max unit oscillator f osc frequency (v pin5 = 0 v, c t = 2.2 nf, t j = 25 c) 110 150 190 khz i dischg /i chg discharge to charge current ratio (pin 7 to v cc , t j = 25 c) 5.5 6.0 6.5 ? i dischg capacitor discharging current (pin 7 to v cc , t j = 25 c) 1650 a i chg capacitor charging current (pin 7 to v cc , t j = 25 c) 275 a v ipk(sense) current limit sense voltage (t j = 25 c) (note 7) 165 200 235 mv output switch (note 6) v swce(drop) darlington switch collector to emitter voltage drop (i sw = 1.0 a, t j = 25 c) (note 6) 1.0 1.3 v i c(off) collector off ? state current (v ce = 40 v) 1.0 10 a comparator v th threshold voltage t j = 25 c 235 mv t j = 0 c to 85 c ? 5% 235 +5% t j = ? 40 c to +125 c ? 10% 235 +10% reg line threshold voltage line regulation (v cc = 3.0 v to 40 v) ? 6.0 2.0 6.0 mv i cii in input bias current (v in = v th ) ? 1000 ? 100 1000 na on/off feature v ih on/off pin logic input level high v out = 0 v t j = 25 c t j = 0 c to +85 c 2.2 2.4 ? ? ? ? v v il on/off pin logic input level low v out = nominal output voltage j = 25 c t j = 0 c to +85 c ? ? ? ? 1.0 0.8 v i ih on/off pin input current on/off pin = 5 v (on) t j = 25 c 15 a i il on/off pin input current on/off pin = 0 v (off) t j = 25 c 1.0 a t on_min on/off pin minimum width t j = 25 c 50 s total device i cc supply current (v cc = 5.0 v to 40 v, ct = 2.2 nf, pin 7 = v cc , v pin 5 > v th , pin 2 = gnd, remaining pins open) 7.0 ma i stby standby quiescent current on/off pin = 5.0 v (off) t j = 25 c t j = ? 40 c to +125 c 85 120 120 a t shd thermal shutdown threshold 160 c t shdhys hysteresis 10 c 6. low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as poss ible. 7. the v ipk (sense) current limit sense voltage is specified at static conditions. in dynamic operation the sensed current turn ? off value depends on comparator response time and di/dt current slope. see the operating description section for details. 8. ncv prefix is for automotive and other applications requiring site and change control and extended operating temperature cond itions.
ncp3066, NCV3066 http://onsemi.com 5 figure 5. oscillator frequency vs. timing capacitor figure 6. oscillator frequency vs. supply voltage ct, capacitance (nf) v in , input voltage (v) figure 7. voltage drop in emitter follower configuration figure 8. common emitter configuration output darlington switch voltage drop vs. temperature t j , junction temperature ( c) t j , junction temperature ( c) frequency (khz) frequency (khz) voltage drop (v) voltage drop (v) 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 ? 40 ? 20 0 20 40 60 80 100 140 i ce = 1 a i ce = 1.25 a i ce = 0.75 a i ce = 0.5 a i ce = 0.25 a 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 i ce = 1.25 a i ce = 1 a i ce = 0.75 a i ce = 0.25 a i ce = 0.5 a ? 40 ? 20 0 20 40 60 80 100 120 0 50 100 150 200 250 300 350 0 2 4 6 8 101214161820 120 125 130 135 140 145 150 0 5 10 15 20 25 30 35 40 120 140 figure 9. v th vs. temperature figure 10. current limit sense voltage vs. temperature t j , junction temperature ( c) t j , junction temperature ( c) reference voltage (v) v ipk , current limit sense voltage (v) 0.230 0.232 0.234 0.236 0.238 0.240 ? 40 ? 20 0 20 40 60 80 100 120 140 0.170 0.175 0.180 0.185 0.190 0.195 0.200 ? 40 ? 20 0 20 40 60 80 100 140 120
ncp3066, NCV3066 http://onsemi.com 6 0 50 100 150 200 250 300 350 400 450 0 5 10 15 20 25 30 35 40 vin, input voltage (v) figure 11. standby supply current vs. supply voltage standby supply current ( a)
ncp3066, NCV3066 http://onsemi.com 7 introduction the ncp3066 is a monolithic power switching regulator optimized for led driver applications. its flexible architecture enables the system designer to directly implement step ? up, step ? down, and voltage ? inverting converters with a minimum number of external components for driving leds. a representative block diagram is shown in figure 3. operating description the ncp3066 operates as a fixed oscillator frequency output voltage ripple gated regulator. in general, this mode of operation is somewhat analogous to a capacitor charge pump and does not require dominant pole loop compensation for converter stability. the typical operating waveforms are shown in figure 12. the output voltage waveform is shown for a step ? down converter with the ripple and phasing exaggerated for clarity. during initial converter startup, the feedback comparator senses that the output voltage level is below nominal. this causes the output switch to turn on and off at a frequency and duty cycle controlled by the oscillator , thus pumping up the output filter capacitor. when the output voltage level reaches nominal comparator value, the output switch cycle is inhibited. when the load current causes the output voltage to fall below the nominal value feedback comparator enables switching immediately. under these conditions, the output switch conduction can be enabled for a partial oscillator cycle, a partial cycle plus a complete cycle, multiple cycles, or a partial cycle plus multiple cycles. oscillator the oscillator frequency and off ? time of the output switch are programmed by the value of the timing capacitor c t . the capacitor c t is charged and discharged by a 1 to 6 ratio internal current source and sink, generating a positive going sawtooth waveform at pin 3. this ratio sets the maximum t on /(t on + t off ) of the switching converter as 6/(6+1) or 85.7% (typical). the oscillator peak and valley voltage difference is 500 mv typically. to calculate the c t capacitor value for required oscillator frequency, use the equations found in figure 15. an online ncp3066 design tool can be found at www.onsemi.com, which aids in selecting component values. figure 12. typical operating waveforms
ncp3066, NCV3066 http://onsemi.com 8 peak current sense comparator under normal conditions, the output switch conduction is initiated by the voltage feedback comparator and terminated by the oscillator. abnormal operating conditions occur when the converter output is overloaded or when feedback voltage sensing is lost. under these conditions, the i pk current sense comparator will protect the darlington output switch. the switch current is converted to a voltage by inserting a fractional ohm resistor, r sense , in series with v cc and darlington output switch. the voltage drop across r sense is monitored by the current sense comparator. if the voltage drop exceeds 200 mv (nom) with respect to v cc , the comparator will set the latch and terminate the output switch conduction on a cycle ? by ? cycle basis. real v turn ? off on r s resistor t_delay i1 io di/dt slope i through the darlington switch v ipk(sense) figure 13. current sense waveform the v ipk(sense) current limit sense voltage threshold is specified at static conditions. in dynamic operation the sensed current turn ? off value depends on comparator response time and di/dt current slope. real v turn ? off on r sc resistor v turn_off = v ipk(sense) + r sense *(t delay *di/dt) typical i pk comparator response time t delay is 350 ns. the di/dt current slope is dependent on the voltage difference across the inductor and the value of the inductor . increasing the value of the inductor will reduce the di/dt slope. it is recommended to verify the actual peak current in the application at worst conditions to be sure that the max peak current will never get over the 1.5 a darlington switch current max rating. thermal shutdown internal thermal shutdown circuitry is provided to protect the ic in the event that the maximum junction temperature is exceeded. when activated, typically at 160 c, the darlington output switch is disabled. the temperature sensing circuit is designed with some hysteresis. the darlington switch is enabled again when the chip temperature decreases under the low threshold. this feature is provided to prevent catastrophic failures from accidental device overheating. it is not intended to be used as a replacement for proper heatsinking. output switch the output switch is designed in darlington configuration. this allows the application designer to operate at all conditions at high switching speed and low voltage drop. the darlington output switch is designed to switch a maximum of 40 v collector to emitter voltage and current up to 1.5 a. on/off function the on/off function provides interruption of switching and puts the circuitry into the low consumption mode. this feature is applicable for digital dimming of the leds as well. the on/off signal inhibits switching of the regulator and reduces the average current through the leds. the frequency of this pulse width ? modulated signal with the duty cycle can range from less than 1% to 100% is limited by the value of 1 khz. pulling this pin below 0.8 v or leaving it opened turns the regulator off. in this state the consumption of the device is reduced below 100 ua. pulling this pin above 2.4 v (up to max. 25 v) allows the regulator running in normal state. if the on/off feature is not needed, the on/off pin can be wired to v cc , provided this voltage does not exceed 25 v. no output capacitor operation a traditional buck topology includes an inductor followed by an output capacitor which filters the ripple. the capacitor is placed in parallel with the led or array of leds to lower the ripple current. a constant current buck regulator such as the ncp3066 focuses on the control of the current through the load, not the voltage across it. the switching frequency of the ncp3066 is in the range of 100 ? 250 khz which is much higher than the human eye can detect. by configuring the ncp3066 in a continuous conduction buck configuration with low peak to peak ripple the output filter capacitor can be eliminated. the important design parameter is to keep the peak current below the maximum current rating of the led. using 15 ? 40% peak to peak ripple results in a good compromise between achieving max average output current without exceeding the maximum limit. this saves space and reduces part count for applications.
ncp3066, NCV3066 http://onsemi.com 9 applications figures 15 through 24 show the simplicity and flexibility of the ncp3066. two main converter topologies are demonstrated with actual test data shown below each of the circuit diagrams. the demo boards have an input for a digital dimming signal. you can provide a pwm signal to change the average output current and reduce the led brightness. figure 14 gives the relevant design equations for the key parameters. additionally, a complete application design aid for the ncp3066 can be found at www.onsemi.com. parameter step ? down step ? up t on t off v out v f v in v swce v out v out v f v in v in v swce t on t on t off f t on t off 1 t on t off f t on t off 1 c t c t 381.6 10 6 f osc 343 10 12 i l(avg) i out i out t on t off 1 i pk (switch) i l(avg) i l 2 i l(avg) i l 2 r sc 0.20 i pk (switch) 0.20 i pk (switch) l v in v swce v out i l t on v in v swce i l t on v ripple(pp) i l 1 8 f c o 2 (esr) 2 t on i out c o i l esr i out v ref r s v ref r s 9. v swce ? darlington switch collector to emitter voltage drop, refer to figures 7 and 8. 10. v f ? output rectifier forward voltage drop. typical value for 1n5819 schottky barrier rectifier is 0.4 v. 11. the calculated t on /t off must not exceed the minimum guaranteed oscillator charge to discharge ratio. figure 14. design equations the following converter characteristics must be chosen: v in ? nominal operating input voltage. v out ? desired output voltage. i out ? desired output current. i l ? desired peak ? to ? peak inductor ripple current. for maximum output current it is suggested that i l be chosen to be less than 10% of the average inductor current i l(avg) . this will help prevent i pk (switch) from reaching the current limit threshold set by r sc . if the design goal is to use a minimum inductance value, let i l = 2(i l(avg) ). this will proportionally reduce converter output current capability. f ? maximum output switch frequency. v ripple(pp) ? desired peak ? to ? peak output ripple voltage. for best performance the ripple voltage should be kept to a low value since it will directly affect line and load regulation. capacitor c o should be a low equivalent series resistance (esr) electrolytic designed for switching regulator applications.
ncp3066, NCV3066 http://onsemi.com 10 figure 15. buck demoboard with external switch application schematic on/off ipk comp swc swe ct gnd v cc on/off v in gnd c 2 +led d 2 ncp3066 soic q 1 r 16 r68 c 7 c 1 + r 10 10k input ? led r 11 1k0 d 1 c 9 100p ic1 c 10 r 19 2n2 r 1 ... r 9 ... + l 1 220 f 9 x 0r15 c 5 1n8 c 8 m15 100nf r 17 r33 r 15 1k0 r 12 12k q 2 1k0 0.1 f table 1. bill of materials desig- nator qty description value toler- ance footprint manufacturer manufacturer part number r1;r2; r3;r4 4 resistor 0.15r 1% 1206 susumu rl1632r-r150-f r10 1 resisitor 10k 1% 1206 rohm mcr18ezhf1002 r11; r15 2 resisitor 1k 1% 1206 rohm mcr18ezpf1001 r12 nu resistor 12k 1% 1206 rohm mcr18ezhf1202 r16 1 resistor 0.68r 5% 1210 panasonic - ecg erj-14rqjr68u r17 option resistor 0.33r 5% 1210 panasonic - ecg erj-14rqjr33u r19 1 resistor 1k 5% 1210 panasonic - ecg erj-14yj102u c1 1 capacitor 220 f/35v 20% 10x12.5 panasonic eeufc1v221 c2;c7 2 capacitor 100nf 10% 1206 kemet c1206c104k5ractu c5 1 capacitor 1.8nf 10% 1206 kemet c1206c182k5ractu c8 1 capacitor 150 f/16v 20% f8 sanyo 16sp150m c9 1 capacitor 100pf 10% 1206 vishay/vitramon vj1206y101kxeat5z c10 1 capacitor 2.2nf 10% 1206 kemet c1206c222k5ractu q1 1 power mosfet ? 25a, -30v ntd18p03l - dpak on semiconductor ntd18p03l q2 1 switching npn transistor mmbt489lt1g - sot-23 on semiconductor mmbt489lt1g d2 1 1a, 30v schottky rectifier mbr130t1g - sod123 on semiconductor mbr130t1g ic1 1 switching regulator ncp3066dr2g - soic-8 on semiconductor ncp3066dr2g d1 1 3a, 30v schottky rectifier mbrs330t3g - smc on semiconductor mbrs330t3g l1 1 inductor 47 h 20% wurth elektronik wurth elektronik we ? pd4 74457147
ncp3066, NCV3066 http://onsemi.com 11 figure 16. buck with external switch demoboard layout figure 17. buck with external switch demoboard photo 350 ma 2 led (v out = 6.4 v) figure 18. efficiency of buck led driver input voltage (v) efficiency (%) 700 ma 2 led (v out = 6.4 v) 350 ma 4 led (v out = 12.8 v) 700 ma 4 led (v out = 12.8 v) figure 19. efficiency of buck led driver at i out = 3 a 50 55 60 65 70 75 80 85 90 10 15 20 25 30 35 input voltage (v) efficiency (%) 55 60 65 70 75 80 85 90 95 10 15 20 25 30 35 3 a 4 led (v out = 12.8 v) 3 a 2 led (v out = 6.4 v) figure 15, buck demoboard with external switch application schematic illustrates the ncp3066 being used as a pfet controller. table 1. bill of materials shows the small number of additional parts which are necessary to assemble mentioned demoboard. the demoboard based on two layer pcb and the layout is mentioned in figure 16. buck demoboard layout. the line regulation is mentioned in figure 20, line regulation. the figure 21, dimming characteristic shows behavior of circuitry in case the square wave signal with 5 v amplitude and 300 hz frequency was delivered into on/off pin of device.
ncp3066, NCV3066 http://onsemi.com 12 figure 20. line regulation input voltage (v) output current (a) i out = 600 ma 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 5102030405060708090100 v in = 10 v ? 15 v v in = 25 v figure 21. dimming characteristic on/off pin duty cycle (%) p led (w) 0 0.10 0.20 0.30 0.40 0.50 0.60 0.70 8 1012141618202224262830 i out = 450 ma i out = 300 ma i out = 150 ma table 2. test results line regulation vin = 12 v to 35 v, iout = 3000 ma 250 ma output ripple vin = 12 v, iout = 3000 ma 320 ma efficiency vin = 12 v, iout = 3000 ma 80%
ncp3066, NCV3066 http://onsemi.com 13 on/off ipk comp swc swe ct gnd v cc on/off v in gnd c 2 100n c 3 +led l 1 r 1 d 1 ncp3066 soic r 5 r68 c 4 c 1 m18 + r 6 r15 10k 100 h 2n2 r 2 100r input ? led r 4 100r d 2 r 3 1k0 3 x 100 f ic1 figure 22. boost demoboard application schematic c 5 c 6 table 3. bill of materials designator qty description value toler- ance foot- print manufacturer manufacturer part number r1 1 resistor 0.15r 1% 1206 susumu rl1632r-r150-f r2;r4 nu resisitor 100r 1% 1206 vishay/dale crcw1206100rfkea r3 1 resisitor 1k 1% 1206 rohm mcr18ezpf1001 r5 1 resistor 0.68r 5% 1210 panasonic - ecg erj-14rqjr68u r6 1 resistor 10k 1% 1206 rohm mcr18ezhf1002 c1 1 capacitor 180 f 20% f8 sanyo 16svps180m c2 1 capacitor 100nf 10% 1206 kemet c1206c104k5ractu c3 1 capacitor 2.2nf 10% 1206 kemet c1206c222k5ractu c4,c5,c6 3 capacitor 100 f 20% 1210 tdk c4532y5v1a107z c10 1 capacitor 2.2nf 10% 1206 kemet c1206c222k5ractu ic1 1 switching regulator ncp3066dr2g - soic-8 on semiconductor ncp3066dr2g d1 1 diode mbrs1540t3g - smb on semiconductor mbrs1540t3g d2 1 zener diode bzx84b18vlt1g - sot-23 on semiconductor bzx84b18vlt1g l2 1 inductor 100 h 20% coilcraft coilcraft do3316p-104mlb
ncp3066, NCV3066 http://onsemi.com 14 figure 23. boost demoboard layout figure 24. boost demonstration photo 60 65 70 75 80 85 90 95 5 7 9 11 13 15 17 19 figure 25. boost led driver efficiency input voltage (v) efficiency (%) 150 ma 8 led (25.6 v) 150 ma 6 led (19.2 v) figure 22, boost demoboard application schematic, illustrates the basic circuitry in boost topology, which allows supplying string up to eight leds up to 150 ma consumption. table 3, bill of materials shows the small number of additional parts which are necessary to assembly mentioned demoboard. the demoboard based on one layer pcb and the layout is shown in figure 23, buck demoboard layout. the photo of this demoboard is mentioned in figure 24, boost demoboard photo. figure 26, dimming characteristic shows behavior of circuitry in case the square wave signal with 5 v amplitude and 300 hz frequency was delivered into on/off pin of device. there was tested eight leds string with 150 ma consumption and v in = 10 v at room temperature. the efficiency of this demoboard is mentioned in figure 25. efficiency of boost led driver. 0 0.50 1.0 1.50 2.0 2.50 3.0 3.50 0 102030405060708090100 figure 26. dimming characteristic on/off duty cycle (%) led power (w) table 4. test results line regulation vin = 10 v to 20 v, vout = 19.2 v, iout = 350 ma 25 ma output ripple vin = 10 v to 20 v, vout = 19.2 v, iout = 350 ma 55 ma efficiency vin = 12 v, vout = 19.2 v, iout = 350 ma 85%
ncp3066, NCV3066 http://onsemi.com 15 vcc gnd ipk comp ct gnd swe swc ? led +led r1 c1 c10 l1 d1 ncp3066 soic c2 ic1 c3 c4 c5 input r6 r7 12k 100r r68 r4 r2 r6 d2 r3 1k0 10k r15 100r 2n2 figure 27. buck demoboard application schematic on/off on/off v in 0.1 f 330 f 47 h 3 x 100 f table 5. bill of materials designator qty. description value tolerance footprint manufacturer manufacturer part number r1 1 resistor 0.15r 1% 1206 susumu rl1632r-r150-f r2; r5 nu resisitor 100r 1% 1206 vishay/dale crcw1206100rfkea r3 1 resisitor 1 k 1% 1206 rohm mcr18ezpf1001 r4 1 resistor 0.68r 5% 1210 panasonic - ecg erj-14rqjr68u r6 1 resisitor 10 k 1% 1206 rohm mcr18ezhf1002 r7 nu resisitor 12 k 1% 1206 rohm mcr18ezpf1202 c1 1 capacitor 330 f 20% f8 panasonic eeefk1e331gp c2 1 capacitor 100 nf 10% 1206 kemet c1206c104k5ractu c3 1 capacitor 2.2 nf 10% 1206 kemet c1206c222k5ractu c4, c5, c6 3 capacitor 100 f 20% 1210 tdk c4532y5v1a107z ic1 1 switching regulator ncp3066 - soic8 on semiconductor ncp3066dr2g d1 1 diode mbrs1504 - smb on semiconductor mbrs1504t3g d2 1 zener diode bzx84c8v2 - sot23 on semiconductor bzx84c8v2lt1g l1 1 inductor 47 h 20% do3316 coilcraft do3316p-473mlb
ncp3066, NCV3066 http://onsemi.com 16 figure 28. buck demoboard layout figure 29. buck demonstration photo the figure 27 buck demoboard application schematic illustrates the basic circuitry in buck topology, which allows supplying one or two leds up to 350 ma consumption. the table 5 bill of ma terials shows the small number of additional parts which are necessary to assembly mentioned demoboard. the demoboard based on one layer pcb and the layout is mentioned in figure 28 buck demoboard layout. the line regulation is mentioned in figure 30 line regulation. the figure 31 shows ef ficiency of buck led driver. figure 30. line regulation figure 31. efficiency of buck led driver input voltage (v) input voltage (v) 30 25 20 35 15 10 5 0 0.05 0.10 0.15 0.20 0.25 0.35 0.40 20 5 30 40 45 55 60 70 75 80 output current (ma) efficiency (%) 0.30 65 50 35 1 led 100 ma 2 led 100 ma 1 led 350 ma 2 led 350 ma 1 led 100 ma 1 led 350 ma 10 15 30 25 35 table 6. test results line regulation vin = 8 v to 20 v, vout = 3.2 v, iout = 350 ma 19 ma output ripple vin = 8 v to 20 v, vout = 3.2 v, iout = 350 ma 32 ma efficiency vin = 12 v, vout = 3.2 v, iout = 350 ma 62%
ncp3066, NCV3066 http://onsemi.com 17 v in on/off on/off v cc i pk comp ct gnd swe swc r sense ncp3066 ic1 r 10k r15 + figure 32. onoff serial resistor connection if the application allows on/off pin to be biased by voltage and the power supply is not connected to vcc pin at the same time, then it is recommended to limit on/off current by resistor with value 10 k to protect the ncp3066 device. this situation is mentioned in figure 32, on/off serial resistor connection. this resistor shifts the on/off threshold by about 200 mv to higher value, but the ttl logic compatibility is kept in full range of input voltage and operating temperature range. ordering information device package shipping ? ncp3066mntxg dfn ? 8 (pb ? free) 4000 / tape & reel ncp3066pg pdip ? 8 (pb ? free) 50 units / rail ncp3066dr2g soic ? 8 (pb ? free) 2500 / tape & reel NCV3066mntxg dfn ? 8 (pb ? free) 4000 / tape & reel NCV3066pg pdip ? 8 (pb ? free) 50 units / rail NCV3066dr2g soic ? 8 (pb ? free) 2500 / tape & reel ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d.
ncp3066, NCV3066 http://onsemi.com 18 package dimensions notes: 1. dimension l to center of lead when formed parallel. 2. package contour optional (round or square corners). 3. dimensioning and tolerancing per ansi y14.5m, 1982. style 1: pin 1. ac in 2. dc + in 3. dc - in 4. ac in 5. ground 6. output 7. auxiliary 8. v cc 14 5 8 f note 2 ? a ? ? b ? ? t ? seating plane h j g d k n c l m m a m 0.13 (0.005) b m t dim min max min max inches millimeters a 9.40 10.16 0.370 0.400 b 6.10 6.60 0.240 0.260 c 3.94 4.45 0.155 0.175 d 0.38 0.51 0.015 0.020 f 1.02 1.78 0.040 0.070 g 2.54 bsc 0.100 bsc h 0.76 1.27 0.030 0.050 j 0.20 0.30 0.008 0.012 k 2.92 3.43 0.115 0.135 l 7.62 bsc 0.300 bsc m --- 10 --- 10 n 0.76 1.01 0.030 0.040 8 lead pdip case 626 ? 05 issue l
ncp3066, NCV3066 http://onsemi.com 19 package dimensions soic ? 8 nb case 751 ? 07 issue aj seating plane 1 4 5 8 n j x 45 k notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.127 (0.005) total in excess of the d dimension at maximum material condition. 6. 751 ? 01 thru 751 ? 06 are obsolete. new standard is 751 ? 07. a b s d h c 0.10 (0.004) dim a min max min max inches 4.80 5.00 0.189 0.197 millimeters b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.053 0.069 d 0.33 0.51 0.013 0.020 g 1.27 bsc 0.050 bsc h 0.10 0.25 0.004 0.010 j 0.19 0.25 0.007 0.010 k 0.40 1.27 0.016 0.050 m 0 8 0 8 n 0.25 0.50 0.010 0.020 s 5.80 6.20 0.228 0.244 ? x ? ? y ? g m y m 0.25 (0.010) ? z ? y m 0.25 (0.010) z s x s m 1.52 0.060 7.0 0.275 0.6 0.024 1.270 0.050 4.0 0.155 mm inches scale 6:1 *for additional information on our pb ? free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint*
ncp3066, NCV3066 http://onsemi.com 20 package dimensions 8 pin dfn, 4x4 case 488af ? 01 issue c dim min max millimeters a 0.80 1.00 a1 0.00 0.05 a3 0.20 ref b 0.25 0.35 d 4.00 bsc d2 1.91 2.21 e 4.00 bsc e2 2.09 2.39 e 0.80 bsc k 0.20 ??? l 0.30 0.50 d b e c 0.15 a c 0.15 2x 2x top view side view bottom view ? ? ? ? ? ?? ? c 0.08 c 0.10 ? ? ? ?? ? e 8x l k e2 d2 b note 3 1 4 5 8 8x 0.10 c 0.05 c ab pin one reference *for additional information on our pb ? free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint* 8x 0.63 2.21 2.39 8x 0.80 pitch 4.30 0.35 l1 detail a l optional constructions ?? ??? ??? ??? 0.15 detail b note 4 detail a dimensions: millimeters package outline on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 ncp3066/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your loca l sales representative

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