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www.irf.com page 1 of 13 IRAUDAMP18 rev 1.0 IRAUDAMP18 35w/4 ? x 2 channel class d audio power amplifier using the ir4312 by jun honda, liwei zheng caution: international rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP18 demo board; ? always wear safety glasses whenever operating demo board ? avoid physical contact with exposed metal surfaces when operating demo board ? turn off demo board when placing or removing measurement probes downloaded from: http:///
www.irf.com page 2 of 13 IRAUDAMP18 rev 1.0 table of contents ........................... page introduction..............................................................................3 specifications ...........................................................................3 connection setup ....................................................................4 test procedures......................................................................5 performance and test graphs ..........................................5 thermal information..............................................................8 schematic ....................................................................................9 IRAUDAMP18 bill of materials ............................................10 IRAUDAMP18 pcb specifications.........................................11 revision changes descriptions .......................................13 downloaded from: http:///
www.irf.com page 3 of 13 IRAUDAMP18 rev 1.0 introduction the IRAUDAMP18 reference design is a two-channel, 35w/ch half-bridge class d audio power amplifier with single power supply. this refere nce design demonstrates how to use the ir4312 ic with single power supply, implement protection circuits, and design an optimum pcb layout using powiraudio integrated class d ic. this reference design does not require additional heatsink or fan cooling for normal operation (one-eighth of continuous rated power).the reference design provides all the required housekeeping power supplies for ease of use. the two-channel design is scalable for power and the number of channels. applications ? docking station audio systems ? pc audio systems ? musical instruments ? karaoke amplifiers ? game consoles ? powered speaker systems ? car audio amplifiers features output power: 35w x 2 channels (4 ? load) multiple protection features: over-current protection (ocp), high side and low side over-voltage protection (ovp), under-voltage protection (uvp), high side and low side over-temperature protection (otp) pwm modulator: self-oscillating half-bridge topology specifications general test conditions (unless othe rwise noted) notes / conditions supply voltages 18-31v load impedance 2-4 ? resistive load self-oscillating frequency 400khz no input signal, adjustable gain setting 21.4db 1vrms input yields rated power electrical data typical notes / conditions ir devices used ir4312 powiraudio integrated class d ic modulator self-oscillating, second order sigma-delta modulation, analog input power supply range 18-31v single power supply; output power ch1-2: (1% thd+n) 26w 1khz output power ch1-2: (10% thd+n) 35w 1khz rated load impedance 2-4 ? resistive load idling supply current 70ma no input signal total idle power consumption 2.2w no input signal distortion 0.018% thd+n @ 3w, 4 ? residual noise 180 ? v ihf-a weighted, aes-17 filter channel efficiency 96% single-channel driven, 35w, class d stage downloaded from: http:///
www.irf.com page 4 of 13 IRAUDAMP18 rev 1.0 connection setup fig 1 typical test setup connector description audio in cn1 analog input for ch1 and ch2 power p3 single supply ch1 out p1 output for ch1 ch2 out p2 output for ch2 cn1 p1 p2 p3 ch1 output ch2 output audio input 18-31 3a dc supply 4 ohm 4 ohm audio signal generator ir4312 sw1 100w, non-inductive resistors sw1:pwm shutdown/mute power indicator fault indicator clip indicator downloaded from: http:///
www.irf.com page 5 of 13 IRAUDAMP18 rev 1.0 test procedures test setup: 1. connect 4 ? , 100w load to both output connectors, p1 and p2 and audio analyzer (ap). 2. connect audio signal generator to cn1 for ch1 and ch2 respectively (ap). 3. connect a single power supply to p3 pre-adjusted to 18-31v as shown on figure above 4. turn on the power supply. 5. turn on sw1(right side). 6. blue led (normal) stays turni ng on after red led extinguished. 7. with an oscilloscope, monitor switching waveform at vs of ch1 and ch2. 8. quiescent current for the power supply should be 70ma ? 10ma at 31v. functionality audio tests: 9. sweep the audio signal voltage from 15 mv rms to 1.5 v rms . 10. monitor the output signals at p1/p2 with an oscilloscope. the waveform must be a non distorted sinusoidal signal with input sinusoidal signal below 1vrms. performance and test graphs power vs thd+n test conditions: vbus = 31v input signal=1 khz load impedance = 4 ohms color sweep trace line style thick data axis comment 1 1 red solid 2 anlr.thd+n ratio left ch1 4ohms 31v 1 3 blue solid 2 anlr.thd+n ratio left ch2 4ohms 31v 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20m 40 50m 100m 200m 500m 1 2 5 10 20 w thd+n vs power fig 2 downloaded from: http:///
www.irf.com page 6 of 13 IRAUDAMP18 rev 1.0 frequency response test conditions: vbus = 31v set output = 1v load impedance = 4 ohms color sweep trace line style thick data axis comment 1 1 red solid 2 anlr.level a left ch1 4ohm sp 25v 1 2 blue solid 2 anlr.level b left ch2 4ohm sp 25v -10 +4 -8 -6 -4 -2 +0 +2 d b r a 20 200k 50 100 200 500 1k 2k 5k 10k 20k 50k 100k hz noise floor test conditions: vbus = 31v load impedance = 4 ohms no input signal color sweep trace line style thick data axis comment 1 1 red solid 2 fft.ch.1 ampl left ch1 1 2 blue solid 2 fft.ch.2 ampl left ch2 -140 +20 -120 -100 -80 -60 -40 -20 +0 d bv 10 20k 20 50 100 200 500 1k 2k 5k 10k hz fig 3 fig 4 downloaded from: http:///
www.irf.com page 7 of 13 IRAUDAMP18 rev 1.0 noise floor with 1vrms output test conditions: vbus = 31v output = 1vrms @ 1 khz load impedance = 4 ohms color sweep trace line style thick data axis comment 1 1 red solid 2 fft.ch.1 ampl left ch1 4ohm 1 2 blue solid 2 fft.ch.2 ampl left ch2 4ohm -100 +0 -80 -60 -40 -20 d bv 10 20k 20 50 100 200 500 1k 2k 5k 10k hz efficiency 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% 100.0% 0 5 10 15 20 25 30 35 40 power (w) efficiency fig 5 fig 6 downloaded from: http:///
www.irf.com page 8 of 13 IRAUDAMP18 rev 1.0 thermal information: 1/8 po thermal test conditions: ? tamb=25c natural convection cooling ? both channel driven 1/8po continuous 30mins ? temperature measured by infrared camera fig 7 IRAUDAMP18 (vbus=31v) ir4312s temperature saturated around 75c within 30minutes downloaded from: http:///
www.irf.com page 9 of 13 IRAUDAMP18 rev 1.0 schematic +b vaa r30 4.7r c25 0.1uf r41 1r c15 1nf c27 0.1uf,100v class d, amp18 ir4312 schematic sch_4312 rev1.2 d1 +b sd vcc vss r31 4.7r c26 0.1uf r42 1r c17 1nf c18 10uf,16v c28 0.1uf,100v c6 2.2nf,50v c11 2.2nf,50v c9 2.2nf,50v c14 2.2nf,50v d2 1n4148 r28 4.7r d4 1n4148 in-2 3 comp2 2 clip 1 nc 30 vp2 24 vs2 25 gnd 5 vs1 20 csh2 27 csh1 16 vb1 17 in+1 8 vn2 22 nc 29 vp1 19 vs2 23 com 15 vs1 18 vss 6 in-1 9 comp1 10 in+2 4 csd 11 fault 12 nc 13 vcc 14 vn1 21 vb2 26 com 28 vaa 7 -b 31 o o ic1 ir4312 c5 10uf,10v c10 10uf,10v r27 10k vaa ds1 ds2 r26 10k vaa d3 1n4148 d5 1n4148 c20 0.1uf c19 0.1uf c16 22uf,16v r29 10k ds3 r35 470r 1w 1 2 3 mj d4 4 h1 1 t4 g q1 r34 4.7k z3 11v cp5 22uf +b r45 2.2k r43 10, 1w lch d6 ct_pgnd 1 2 p1 d7 c33 0.1uf, 63v r46 2.2k r44 10, 1w rch ct_pgnd 1 2 p2 c34 0.1uf, 63v d9 d8 ct_sgnd c12 2.2nf,50v r19 180r r24 180r c7 2.2nf,50v r22 180r vss r21 180r c13 2.2nf,50v r20 180r r23 180r c8 2.2nf,50v r1 100k r3 330 c1 1nf r4 330 c2 1nf r11 *3.01k 1% r15 47.5k 1% r12 *3.01k 1% r16 47.5k 1% ct_sgnd ct_sgnd input gnd r2 100k r5 330 c3 1nf r6 330 c4 1nf r13 *3.01k 1% r17 47.5k 1% r14 *3.01k 1% r18 47.5k 1% ct_sgnd ct_sgnd r48 10k, 1/2w r49 10k, 1/2w c36 0.1uf,100v +- c37 0.1uf,100v +b gnd +b gnd 1 2 p3 r53 10k z5 16v z4 33v r51 47k r52 10k r55 47k r56 10k r57 47k 1 2 3 5 4 6 s1 sw spdt c35 0.1uf q2 mmbt5551 q3 mmbt5551 +b sd ovp uvp +b gnd gnd off on ct_sgnd ct_pgnd ct_pgnd gnd gnd input gnd r50 10r0 ct_pgnd gnd r8 220r 1w r7 220r 1w z1 5.1v gnd z2 5.1v +b r47 nm gnd +b gnd gnd r25 47k d10 l1 22uh l2 22uh c21 0.1uf,16v vcc r32 2.7k r33 2.7k c31 0.47uf, 400v c32 0.47uf, 400v 2 1 3 5 4 cn1 cp1 2.2uf cp2 2.2uf cp3 2.2uf cp4 2.2uf c38 2200uf, 25v c39 2200uf, 25v 18v-31v version fig 8 downloaded from: http:///
www.irf.com page 10 of 13 IRAUDAMP18 rev 1.0 bill of materials no digikey p/n designator description quantity vender 1 399-1082-1-nd c1, c2, c3, c4, c15, c17 cap cer 1000pf 50v 10% x7r 0603 6 digikey 2 587-2668-1-nd c5, c10 cap cer 10uf 10v 10% x7r 0805 2 digikey 3 490-1500-1-nd c6, c7, c8, c9, c11, c12, c13, c14 cap cer 2200pf 50v 10% x7r 0603 8 digikey 4 587-1433-1-nd c16 cap cer 22uf 16v 20% x5r 1206 1 digikey 5 490-5519-1-nd c18 cap cer 10uf 16v 10% x6s 0805 1 digikey 6 311-1140-1-nd c19, c20 cap cer 0.1uf 50v 10% x7r 0805 2 digikey 7 311-1142-1-nd c21 cap cer 0.1uf 16v 10% x7r 0805 1 digikey 8 445-1418-1-nd c25, c26 cap cer 0.1uf 100v 10% x7r 0805 2 digikey 9 445-1377-1-nd c27, c28, c36, c37 cap cer 0.1uf 100v 10% x7r 1206 4 digikey 10 495-1315-nd c31, c32 cap film 0.47uf 400vdc radial 2 digikey 11 bc2054-nd c33, c34 cap film 0.1uf 63vdc radial 2 digikey 12 445-1418-1-nd c35 cap cer 0.1uf 100v 10% x7r 0805 1 digikey 13 565-1064-nd c38, c39 cap alum 2200uf 25v 20% radial 2 digikey 14 cp1-3545n-nd cn1 conn jack stereo r/a 5pin 3.5mm 1 digikey 15 565-1103-nd cp1, cp2, cp3, cp4 cap alum 2.2uf 50v 20% radial 4 digikey 16 565-1056-nd cp5 cap alum 22uf 25v 20% radial 1 digikey 17 1n4148w-fdict-nd d1, d2, d3, d4, d5, d10 diode switch 100v 400mw sod123 6 digikey 18 160-1181-1-nd ds1 led red clear 0603 smd 1 digikey 19 160-1183-1-nd ds2 led green clear 0603 smd 1 digikey 20 160-1646-1-nd ds3 led blue clear 0603 smd 1 digikey 21 ir4312 ic1 2 ch powiraudio integrated class d ic 1 ir 22 sagami 7g14a-220m-r l1, l2 power inductors class d inductor 22uh 2 inductors, inc 23 281-1414-nd p1, p2, p3 conn term block pcb 5.0mm 2pos 3 digikey 24 mjd44h11t4gosct-nd q1 trans pwr npn 8a 80v dpak 1 digikey 25 mmbt5551fsct-nd q2, q3 transistor npn 160v sot-23 2 digikey 26 rmcf0603jt100kct-nd r1, r2 res 100k ohm 1/10w 5% 0603 smd 2 digikey 27 rmcf0603jt330rct-nd r3, r4, r5, r6 res 330 ohm 1/10w 5% 0603 smd 4 digikey 28 rmcf2512jt220rct-nd r7, r8 res 220 ohm 1w 5% 2512 smd 2 digikey 29 rhm3.01kcrct-nd r11, r12, r13, r14 res 3.01k ohm 1/8w 1% 0805 smd 4 digikey 30 311-47.5kcrct-nd r15, r16, r17, r18 res 47.5k ohm 1/8w 1% 0805 smd 4 digikey 31 rhm180gct-nd r19, r20, r21, r22, r23, r24 res 180 ohm 1/10w 5% 0603 smd 6 digikey 32 rhm47kgct-nd r25 res 47k ohm 1/10w 5% 0603 smd 1 digikey 33 rhm10kgct-nd r26, r27, r29 res 10k ohm 1/10w 5% 0603 smd 3 digikey 34 rmcf0603jt4r70ct-nd r28, r30, r31 res tf 1/10w 4.7 ohm 5% 0603 3 digikey 35 rhm2.7kgct-nd r32, r33 res 2.7k ohm 1/10w 5% 0603 smd 2 digikey 36 311-4.7karct-nd r34 res 4.7k ohm 1/8w 5% 0805 smd 1 digikey 37 pt470xct-nd r35 res 470 ohm 1w 5% 2512 smd 1 digikey 38 p1.0act-nd r41, r42 resistor 1.0 ohm 1/8w 5% 0805 2 digikey 39 541-10.0afct-nd r43, r44 res 10.0 ohm 1w 1% 2512 smd 2 digikey 40 rmcf0805jt2k20ct-nd r45, r46 res 2.2k ohm 1/8w 5% 0805 smd 2 digikey 41 541-10kvct-nd r48, r49 res 10k ohm 1/2w 5% 1210 smd 2 digikey downloaded from: http:///
www.irf.com page 11 of 13 IRAUDAMP18 rev 1.0 42 rmcf0805jt10r0ct-nd r50 res 10 ohm 1/8w 5% 0805 smd 1 digikey 43 rhm47karct-nd r51, r55, r57 res 47k ohm 1/8w 5% 0805 smd 3 digikey 44 rhm10karct-nd r52, r53, r56 res 10k ohm 1/8w 5% 0805 smd 3 digikey 45 360-1758-nd s1 switch toggle spdt .4va seal pcb 1 digikey 46 ddz5v1bdict-nd z1, z2 diode zener 5.1v 500mw sod- 123 2 digikey 47 bzt52c11-fdict-nd z3 diode zener 11v 500mw sod123 1 digikey 48 568-3766-1-nd z4 diode zener 33v 375mw sod123f 1 digikey 49 bzt52c16-fdict-nd z5 diode zener 16v 500mw sod- 123 1 digikey pcb specifications pcb: 1. two 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. silk screen to be white epoxy non conductive per ipcCrb 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 C0.000 inches 10. tolerance of all holes is -.000 + 0.003 11. pcb acceptance criteria as defined for class ii pcbs standards. downloaded from: http:///
www.irf.com page 12 of 13 IRAUDAMP18 rev 1.0 pcb layout top side: fig9 bottom side: fig10 note: refer to an1170 for footprint and board mounting details. downloaded from: http:///
www.irf.com page 13 of 13 IRAUDAMP18 rev 1.0 revision changes descriptions revision changes description date rev 1.0 released may 11, 16 2012 world headquarters: 101 n. sepulveda blvd., el segundo, ca lifornia 90245 tel: (310) 252-7105 data and specifications su bject to change without notice. 05/16/2012 downloaded from: http:///

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