IRAUDAMP3

IRAUDAMP3 120W x 6 Channel Class D Audio Power Amplifier using IRS20124S and IRF6645 By Jun Honda, Johan Strydom and Jorge Cerezo Table of Contents Page Introduction .......................................................................................... 1 Specifications ....................................................................................... 2 Functional Description.......................................................................... 4 Protection .............................................................................................11 Typical Performance ............................................................................15 Design Documents ..............................................................................20 The IRAUDAMP3 reference design is an example of a complete six-channel 120W half-bridge Class D audio power amplifier. The reference design is intended to demonstrate how to use the IRS20124S, implement protection circuits, and design an optimum PCB layout using IRF6645 DirectFET® MOSFETs. The modular design consists of a motherboard with three identical daughter boards. The resulting design requires no heat-sinking for normal operation. The reference design includes all the required housekeeping power supplies for ease of use. www.irf.com Introduction The IRAUDAMP3 reference design is an example of a complete six-channel 120W halfbridge Class D audio power amplifier. The reference design is intended to demonstrate how to use the IRS20124S, implement protection circuits, and design an optimum PCB layout using IRF6645 DirectFET® MOSFETs. The modular design consists of a motherboard with three identical daughter boards. The resulting design requires no heatsinking for normal operation. The reference design includes all the required housekeeping power supplies for ease of use. Applications AV receivers Home theater systems Mini component stereos Sub-woofers Features Output power: Residual noise: Distortion: Efficiency: Multiple protection features: PWM modulator: 120W x 6 Channels, (THD = 1%) 56µV, IHF-A weighted, AES-17 filter 0.01% THD+N @ 60W, 4Ω 94% @ 120W, 4Ωsingle channel driven, Class D stage OCP, OVP, UVP, DC protection, OTP Self-oscillating half-bridge topology with optional clock synchronization www.irf.com 1 Specifications General Test Conditions (unless otherwise noted) Notes / Conditions Supply Voltage ±35V Load Impedance 4Ω Self-Oscillating Frequency (Adjustable) 400kHz No input signal Gain Setting 26dB 1Vrms input sensitivity Electrical Data IR Devices Used Modulator Power Supply Range Output Power CH1-6: (1% THD+N) Output Power CH1-6: (10% THD+N) Rated Load Impedance Damping Factor Supply Current Total Idle Power Consumption Board Efficiency ± 25-35V 120W 170W 4Ω 40 40V) or too low (< 20V). One of the easiest countermeasures is to drive both of the channels out of phase so that the energy flow from one channel is consumed by the other and does not return to the power supply. Input A proper input signal is an analog signal below 20kHz, up to ±3.5V peak, having a source impedance of less than 600Ω. A 30kHz to 60kHz input signal can cause LC resonance in the output LPF, resulting in an abnormally large amount of reactive current flowing through the switching stage (especially at 8Ω or open load), causing OCP activation. The IRAUDAMP3 has an RC (Zobel) network, to damp the resonance and protect the board in such a condition. However, these supersonic input frequencies should be avoided. The input to each of the six channels is made using a separate mono RCA connector. Although all six channels share a common ground, it is necessary to connect each channel separately to limit noise and crosstalk between channels. www.irf.com 5 Output All the outputs for the IRAUDAMP3 are single-ended and therefore have terminals labeled (+) and (-) with the (-) terminal connected to Power Ground. Each channel is optimized for a 4Ω speaker load for a maximum output power (120W), but is capable of operating with higher load impedances, at reduced power, at which point, the frequency response will have a small peak at the corner frequency of the output LC LPF. The IRAUDAMP3 is stable with capacitive loading, however, it should be realized that the frequency response will be degraded by heavy capacitive loading of more than 0.1µF Gain Setting / Volume Control The IRAUDAMP3 has an internal volume control (potentiometer R156 labeled ‘VOLUME’) for gain adjustment. Gain settings for all six channels are tracked and controlled by the volume control IC setting the gain from the micro controller IC, U1. The maximum volume setting (fully clockwise) corresponds to a total gain of +37.9dB (78.8V/V). The total gain is a product of the power stage gain, which is a constant +23.2dB, and the input-stage gain is directly controlled by the volume adjustment. The volume range is about 100dB with minimum volume setting to ‘mute’ the system with an overall gain of less than -60dB. For best performance in your testing, the internal volume control should be set to a gain of 21.9V/V, or 1Vrms input will result in rated output power (120W into 4Ω),allowing for a >11dB overdrive. Self-Oscillating PWM modulator The IRAUDAMP3 Class D audio power amplifier is based on a self-oscillating type PWM modulator for the lowest component count and a robust design. This topology is basically an analog version of a second-order sigma-delta modulation having a Class D switching stage inside the loop. The benefit of Sigma-Delta modulation in comparison to the carrier signal-based modulator is that all the error in the audible frequency range is shifted away into the inaudible upper frequency range by the nature of its operation, and applies a sufficient amount of correction. The self-oscillating frequency is a determined by the total delay time in the control loop of the system. The delay of the logic circuits, the IRS20124S gate-driver propagation delay, the IRF6645 DirectFET MOSFET switching speed, the time constant of the front end integrator (e.g. R15 + R19, C1 and C2 for Ch-1) and supply-voltages are all critical factors of the self-oscillating frequency. Under nominal conditions, the switchingfrequency is around 400kHz with no audio input signal. Adjustments of Self-Oscillating Frequency The PWM switching frequency in this type of self-oscillating scheme greatly impacts audio performance, both in absolute frequency and frequency relative to the other channels. 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 best to either match the frequencies accurately, or have them separated by at least 25kHz. In this design, it is possible to change the self-oscillating frequency from about 180kHz up to 470kHz. www.irf.com 6 Potentiometers for adjusting self-oscillating frequency Component Number Adjustment R19 Switching Frequency for CH-1* R20 Switching Frequency for CH-2* R54 Switching Frequency for CH-3* R55 Switching Frequency for CH-4* R86 Switching Frequency for CH-5* R87 Switching Frequency for CH-6* *Adjustments have to be done at an idling condition with no signal input. Switches and Indicators There are three different indicators on the reference design: – An orange LED, signifying a fault / shutdown condition when lit – A green LED on the motherboard indicates power is applied to the motherboard – Green LEDs on each of the three daughter boards, signify power is on There are three switches on the reference design: – Switch S1 is a “Shutdown” push-button. Pushing this button has the same effect as having a fault condition. The circuit will re-start about 3 seconds after the shutdown button is released. – Switch S2: Internal clock-sync frequency selector. This feature demonstrates avoiding AM radio interference by slightly modifying the switching frequency. With S3 is set to INT, the two settings ‘H’ and ‘L’ will modify the internal clock frequency by about 20kHz to 40kHz, either higher ‘H’ or lower ‘L’. The actual internal frequency is set by potentiometer R180 - ‘INT OSC FREQ’. – Switch S3: Oscillator selector – This 3-position switch selects between the internal self oscillator (‘SELF’), internal- (‘INT’) or external clock-sync (‘EXT’). Switching Frequency Lock / Synchronization Feature For single-channel operation, the self-oscillating switching scheme will yield the best audio performance. The self-oscillating frequency does, however, change with duty ratio. This varying frequency can interfere with AM radio broadcasts. A constant switching frequency, with its harmonics that are shifted away from the AM carrier frequency, is preferred. Apart from AM broadcasts, the addition of multiple channels can also reduce audio performance at low power, and can lead to increased residual noise. Both characteristics of the self-oscillating switching scheme can be improved through the addition of clock frequency locking / synchronization. Please note that the switching frequency lock / synchronization feature is not possible for all frequencies and duty ratios, but only operates within a limited frequency and dutyratio range below the self-oscillating frequency (see figure below). www.irf.com 7 450 Self-oscillating frequency 400 Self-Osc.(kHz) Clk @ 250kHz Frequency (kHz) 350 Clk @ 275kHz Clk @ 300kHz Lock frequency range 300 Clk @ 325kHz Clk @ 350kHz Clk @ 375kHz 250 Clk @ 395kHz 200 10 20 30 40 50 60 70 80 90 Duty-ratio (%) Typical lock frequency range vs. PWM duty ratio for different internal clock frequencies (Self-oscillating frequency set to 400kHz with no input) Considering the THD+N ratio vs. output power results below, it can be seen that having all channels driven (ACD) with the self oscillator, noise levels increase, especially below the 5W range. Residual noise doubles (see Specifications – Audio Performance) compared to having only a single channel driven. By locking the oscillator frequency, the residual noise can be lowered to that of a single channel driven system. The output power range, for which the frequency locking is successful, depends on how much lower the locking frequency is with respect to the self-oscillating frequency. As the locking frequency is lowered (from 395kHz to 350kHz and then 300kHz), the output power range (where locking is achieved) is extended. Once locking is lost, however, the audio performance is reduced, with lower locking frequencies leading to larger THD. In the IRAUDAMP3, this switching frequency lock / synchronization feature can be achieved through the use of either an internal or an external clock input (selectable through S3). If internal (INT) clock is selected, the internally generated clock signal will be used and can be adjusted by setting potentiometer R180 - ‘INT OSC FREQ’. If external (EXT) clock signal is selected, a 0-5V, square-wave (50% duty-ratio) logicsignal must be applied to J17. Offset Null (DC Offset) The IRAUDAMP3 has been designed such that no output-offset nulling is required. The reference boards will have DC offsets tested to be less than ±50mV. www.irf.com 8 10 0 5 0 2 0 1 0 5 2 1 0 .5 0 .2 Self Osc. (ACD) @ 400kHz 0 .1 05 .0 02 .0 01 .0 00 .0 5 00 .0 2 00 .0 1 10 0m 20 0m Self Osc. (Single Channel Driven) Int. Clk.. (ACD) @ 395kHz Int. Clk.. (ACD) @ 300kHz % Int. Clk.. (ACD) @ 350kHz 50 0m 1 2 5 W 1 0 2 0 5 0 10 0 20 0 THD+N ratio vs. output power for different switching frequency lock / synchronization conditions Gate Driver IC The IRAUDAMP3 uses the IRS20124S, which is a high-voltage (200V), high-speed power MOSFET gate driver with internal deadtime and shutdown functions specially designed for Class D audio amplifier applications. In this design, deadtime can be minimized to optimize performance while limiting shoot-through. Because of this, there is no gate timing adjustment on the board. Selectable deadtime through the DT/SD pin voltage is an easy and reliable function which requires only two external resistors, R1 and R2. The bi-directional current sensing feature is also selected externally by resistors R3, R4, and R5 and can protect the IRS20124S and shutdown the DirectFET MOSFETs during over-current conditions. System-level view of gate driver IRS20124S www.irf.com 9 Selectable Deadtime The DT/SD pin provides two functions: 1) setting deadtime and 2) selecting shutdown. The IRS20124S determines its operation mode based on the voltage applied to the DT/SD pin. An internal comparator translates which mode is being used by comparing internal reference voltages. Threshold voltages for each mode are set internally by a resistive voltage divider off VCC, negating the need for a precise, absolute voltage to set the mode. 1) Threshold voltages for the mode selection are set internally, based on different ratios of VCC as indicated in the diagram below. In order to avoid drift from the input bias current of the DT/SD pin, a bias current of greater than 0.5mA is suggested for the external resistor divider circuit. Suggested values of resistance that are used to set a deadtime are given below. Resistors with up to 5% tolerance can be used. Deadtime / operation mode settings vs VDT/SD voltage Dead-time mode DT1 DT2 DT3 DT4 Dead-time ~15ns ~25ns ~35ns ~45ns R1 120W, the average power is limited to 1/8th of rated power. This is generally considered to be the normal operating condition in safety standards and the IRAUDAMP3 requires no heatsinking under normal operation. For higher average power conditions, however, additional cooling would be required. 100% 10% THD+N 95% 90% 1% THD+N Power Stage Efficiency (%) 85% 80% 75% 70% 65% 60% 55% 50% 0 20 40 60 80 100 120 140 160 180 Output Power (W) Efficiency vs. output power, 4Ω single channel driven, Tambient = 25°C 77°C 58°C Thermal image of daughter board running at 2ch x 1/8th rated power - steady state, TC < 58°C www.irf.com 14 Typical Performance ±B supply = ±35V, load impedance = 4Ω, 1kHz audio signal, Self Oscillator @ 400kHz and internal volume control set to give required output with 1Vrms input signal, unless otherwise noted. International Rectifier A-ATH vs FREQ EN D+N U CY 11/21/05 19:23:40 +4 +2 +0 -2 d B r A -8 -10 -12 -14 20 -4 -6 8Ω 4Ω 50 100 200 500 1k 2k H z 5k 10k 20k 50k 100k 200k Green Yellow CH1 - 4Ω, 2V Output CH1 - 8Ω, 2V Output Frequency characteristics vs. load impedance International Rectifier +0 -10 -20 -30 -40 -50 d B -60 -70 -80 -90 -100 -110 A-A FREQUENCY RESPONSE 12/19/05 09:27:51 Self Int. 50 100 200 500 Hz 1k 2k 5k 10k 20k -120 20 Red Green CH2 – CH1, 60W, Self Oscillator @ 400kHz CH2 – CH1, 60W, Internal Clock @ 395kHz Channel separation vs. frequency www.irf.com 15 International Rectifier 100 50 20 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 T A-A TH vs POW D+N ER 11/21/05 18:55:20 ±30V ±25V % ±35V 2 5 W 10 20 50 100 200 Green Yellow Red CH1, ±B = ±35V, Volume gain 21.9V/V CH1, ±B = ±30V, Volume gain 21.9V/V CH1, ±B = ±25V, Volume gain 21.9V/V THD+N ratio vs. output power International Rectifier 100 50 20 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 100m 200m 500m 1 T A-A TH vs POWER D+N 11/21/05 18:37:01 ±30V ±25V % ±35V 2 5 W 10 20 50 100 200 Green Yellow Red CH1 - ACD, ±B = ±35V, Volume gain 21.9V/V CH1 - ACD, ±B = ±30V, Volume gain 21.9V/V CH1 - ACD, ±B = ±25V, Volume gain 21.9V/V THD+N ratio vs. output power (ACD) www.irf.com 16 International Rectifier 100 50 20 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 50 100 200 A-A TH vs FREQU CY D+N EN 11/21/05 19:06:25 % 100W 10W 1W 500 H z 1k 2k 5k 10k 20k Green Yellow Red CH1, 1W Output CH1, 10W Output CH1, 100W Output THD+N ratio vs. frequency International Rectifier 100 50 20 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 50 100 200 A-A TH vs FREQU CY D+N EN 11/21/05 19:11:56 % 100W 1W 10W 500 H z 1k 2k 5k 10k 20k Green Yellow Red CH1 - ACD, 1W Output CH1 - ACD, 10W Output CH1 - ACD, 100W Output THD+N ratio vs. frequency (ACD) www.irf.com 17 International Rectifier +0 -10 -20 -30 -40 d B V -50 -60 -70 -80 -90 -100 -110 -120 10 A-A FFT SPECTRUMANALYSIS 11/22/05 10:27:21 Self Int. 20 50 100 200 500 Hz 1k 2k 5k 10k 20k Green Red CH1 - ACD, 1V, 1kHz, Self Oscillator @ 400kHz CH1 - ACD, 1V, 1kHz, Internal Clock @ 395kHz Frequency spectrum (ACD) International Rectifier +0 -10 -20 -30 -40 d B V -50 -60 -70 -80 -90 -100 -110 -120 10 A-A FFT SPECTRUMANALYSIS 11/22/05 10:24:57 Self Int. 20 50 100 200 500 Hz 1k 2k 5k 10k 20k Green Red CH1 - ACD, No signal, Self Oscillator @ 400kHz CH1 - ACD, No signal, Internal Clock @ 395kHz Residual noise (ACD) www.irf.com 18 60W / 4Ω, 1kHz, THD+N=0.009% 174W / 4Ω, 1kHz, THD+N=10% Measured output and distortion waveforms Inductor current OC pin VS pin OC pin VS pin Inductor current SD pin SD pin Typical OCP waveforms showing OC output and SD input www.irf.com 19 IRAUDAMP3 Design Documents Motherboard Schematics: Housekeeping and protection circuits www.irf.com 20 Audio channels 1 and 2 www.irf.com 21 Audio channels 3 and 4 www.irf.com 22 Audio channels 5 and 6 www.irf.com 23 Daughter Board Schematics: Daughter-board schematic with Class D stage for 2 audio channels www.irf.com 24 IRAUDAMP3 Bill of Materials Motherboard: IRAUDAMP3 MOTHERBOARD BILL OF MATERIAL NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 Designator C1, C2, C3, C4 C5, C6, C30, C31, C54, C55 C7, C8, C10, C11, C32, C33, C35, C36, C56, C57, C59, C60 C9, C12, C13, C14, C24, C25, C48, C49, C72, C73, C146 C16, C17, C40, C41, C64, C65 C18, C19, C42, C43, C66, C67 C18_2, C19_2, C42_2, C43_2, C66_2, C67_2 C20, C21, C130, C131, C132, C133 C22, C126, C127, C128, C129, C137 C23, C80 C26, C27, C28, C29, C50, C51, C52, C53 C46, C58, C70, C74, ,C75, C76, C77, C78, C79, C81, C99, C100, C101, C110, C111, C116, C121, C122 C82, C83, C84, C85, C86, C87 C88, C89, C90, C91, C92, C93 C94, C95 C96 C97, C117 C98, C124 C118 C119 C120 C123 C125, C134, C135, C136, C138, C139 D1, D2, D4, D5, D6, D7, D8, D10, D11, D12, D13, D14, D15, D16, D17,D18, D19, D20, D21 D3 D30, D31 HS1 J1, J7, J12 J2, J3, J8, J9, J13, J14 J4 J5, J6, J10, J11, J15, J16 J17 J18, J19, J20 J21 L1, L2, L3, L4, L5, L6 LED GR LED ORANGE P1 Q1, Q2, Q3, Q7, Q8, Q13, Q14, Q19, Q20, Q26 Q4, Q5, Q9 Q6, Q10, Q11 Q27 R1, R5, R36, R40, R68, R72, R117 R2, R3, R4, R6, R7, R8, R14, R32, R37, R38, R39, R41, R42, R43, R69, R70, R71, R73, R74, R75, R96, R143, R168, R175, R191 R9, R11 R10, R13, R45, R112, R114, R118, R119, R120, R176, R186, R187, R190 R12, R25, R139, R140, R141, R142 R15, R17, R50, R52, R67, R82, R84, R107, R111, R121, R129, R154, R163, R172, R179, R205 R16, R18, R21, R22, R23, R24, R51, R53, R56, R57, R58, R59, R83, R85, R88, R89, R90, R91, R122, R123, R125, R126, R136, R137 R19, R20, R54, R55, R86, R87 # 4 6 12 11 6 6 6 6 6 2 8 18 6 6 2 1 2 2 1 1 1 1 6 19 1 2 1 6 6 1 6 1 6 1 6 1 1 1 10 3 3 1 7 25 2 12 6 16 24 Footprint 1206 AXIAL0.19R CR3225-1210 0805 RB5/10 AXIAL0.2R CAP MKP AXIAL0.3R 0805 RB2/5-16V 0805 RB2/5 CR3225-1210 AXIAL0.1R 0805 0805 0805 0805 0805 0805 0805 1206 1206 SOD-123 SOD-123 SOD-123 Heat_S6in1 CON EISA31 CP1418 J HEADER3 MKDS5/2-9.5 BNC-RA-CON CON_POWER ED1567 INDUCTOR Led rb2/5 Led rb2/5 DIP-6 SOT23-BCE SOT23-BCE SOT23-BCE SOT89 1206 0805 CR5025-2010 0805 1206 0805 0805 PartType 1nF, 200V 150pF, 500V 3.3uF, 50V OPEN 470uF,50V CAP 0.47uF, 250V 0.1uF, 63V 120pF, 50V 100uF, 16V 1nF, 200V 10uF, 50V 4.7uF, 25V CAP 0.1uF, 50V 47pF, 50V 4.7uF, 16V 10nF, 50V 1nF, 50V 1500pF, 50V 220pF, 50V 47nF, 50V 0.1uF, 50V 1N4148 OPEN MA2YD2300LCT HEAT SINK CON EISA31 1418-ND 277-1272 277-1022 BNC CON_POWER ED1567 18uH 404-1109 404-1107 PVT412 MMBT5401 MMBT5551 MMBT3904 FX941 1K 1K 46.4K, 1W 10K 2.2K 100R 4.7R Part No PCC2009CT-ND 338-1052-ND 445-1432-1-ND OPEN 01E9650 OPEN 495-1298-ND BC2054-ND PCC121CGCT-ND 493-1283-ND PCC1997CT-ND 03B2235 PCC2251CT-ND OPEN PCC1840CT-ND PCC470CGCT-ND PCC2323CT-ND PCC103BNCT-ND PCC102CGCT-ND PCC2004CT-ND PCC1953CT-ND 311-1178-1-ND PCC104BCT-ND 1N4148WDICT-ND Newark Digikey Digikey Digikey Digikey Digikey Newark Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Vender Digikey Digikey Digikey MA2YD2300LCT-ND 294-1086-ND A26453-ND CP-1418-ND 277-1272-ND 277-1271-ND A24497-ND A26454-ND ED1567 Custom made 404-1109-ND 404-1107-ND PVT412-ND MMBT5401DICT-ND MMBT5551DICT-ND MMBT3904DICT-ND FCX491TR-ND P1.0KECT-ND P1.0KACT-ND 01H0485 P10KACT-ND P2.2KECT-ND P100ACT-ND P4.7ACT-ND Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Newark Digikey Digikey Digikey Digikey 50 6 POT_SRM 1K 3361P-102GCT-ND Digikey www.irf.com 25 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 R26, R27, R31, R65, R66, R113, R150, R151, R152, R181, R182, R183, R184 R28, R29, R60, R61, R92, R93 R30, R62, R79, R81, R97, R98, R130, R131, R133, R145, R153, R164, R165, R169, R170, R177, R189, R198, R199, R200 R33, R44, R46, R76, R78, R100, R101, R102, R103, R104, R105, R146, R197 R34, R35, R193, R194, R195, R196 R94, R109, R127, R132, R135, R166, R216 R95, R99, R134, R155, R167, R171 R106 R108, R110, R218, R219 R115, R147 R116 R156 R178 R180 R188 R206, R207, R210, R211, R214, R215 R217 S1 S2 S3 TP U1, U4, U7, U10, U11, U12 U2, U3, U5, U6, U8, U9, U17, U18, U19, U20, U21, U22 U13 U14 U15 U16 U_1 U_2, U_3, U_4 U_5 W43, W51, W52, W53, W67, W68, W77, W78, W96, W97, W101, W102, W104 W2, W3, W4, W6, W7, W8, W10, W11, W12, W30, W54, W57, W91, W92, W93, W98, W99, W100, W106, W109 W41 W14, W23, W34, W39, W40, W42, W59, W103, W107 W16, W18, W36, W50, W56, W60, W69, W81, W105 W45, W46, W62, W72 W22, W25, W27, W55, W85, W90, W95 W24, W47, W49, W63, W65, W66, W73, W75, W76, W84 W44, W61, W71, W74, W94, W108 W20, W58, W79, W87, W88, W89 Z1 Z7, Z9 Z8 Z11 Z12 Volume control knob Thermalloy with screw Standoffs screw Washer Lock 13 6 20 13 6 7 6 1 4 2 1 1 1 1 1 6 1 1 1 1 1 6 12 1 1 1 1 1 3 1 27 20 1 9 9 4 7 10 6 6 1 2 1 1 1 1 3 5 5 5 0805 1206 0805 0805 2512 0805 1206 1206 2512 0805 1206 V_CONTROL 1206 POT 0805 0805 1206 SWITCH SW-EG1908 SW-EG1944 OPEN SO-8 SOT25 TO-220 FULLPAK TO-220 FULLPAK TO-220 F SOT23-123 N8A SOIC16 M14A J1-750 J1-975 J1-720 J1-570 J1-650 J1-350 J1-200 J1-300 J1-430 J1-500 SOD-123 DL-41 SOD-123 SOD-123 SOD-123 100K 3.3K 47R 47K 10, 1W 10R 4.7R 47K 47R, 1W 4.7K 10K CT2265-ND 100R 5K POT 390R OPEN 0R SW-PB SW_H-L SW-3WAY_AB OPEN TLC081 74AHC1G04 MC78M12 MC78M05 MC79M05 MN13821TP 3310IR01 CS3310 74HC04 Jumper Jumper Jumper Jumper Jumper Jumper Jumper Jumper Jumper Jumper 18V 4.7V 15V 39V 24V P100KACT-ND P3.3KECT-ND P47ACT-ND P47KACT-ND PT10XCT P10ACT-ND P4.7ECT-ND P47KECT-ND PT47XCT-ND P4.7KACT-ND P10KECT-ND CT2265-ND P100ECT-ND 3362H-502-ND P390ACT-ND OPEN P0.0ECT-ND P8010S-ND EG1908-ND EG1944-ND OPEN 299-7264-1-ND 296-1089-1-ND MC78M12CTOS-ND MC78M05CTOS-ND MC79M05CTOS-ND MN13821TPCT-ND 3310IR01 73C8016 296-1189-1-ND ZO-1/8W-T ZO-1/8W-T ZO-1/8W-T ZO-1/8W-T ZO-1/8W-T ZO-1/8W-T ZO-1/8W-T ZO-1/8W-T Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Japan* Newark Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey ZO-1/8W-T Digikey ZO-1/8W-T Digikey BZT52C18-FDICT-ND Digikey ZM4732ADICT-ND Digikey BZT52C15-FDICT-ND Digikey BZT52C39-13-FDITR-ND Digikey BZT52C24-FDICT-ND Digikey MCCPMB1 Newark 46F4081 Newark 2210K-ND Digikey H354-ND Digikey H244-ND Digikey *Tachyonix Corporation, 14 Gonaka Jimokuji Jimokuji-cho, Ama-gun Aichi, JAPAN 490-1111 http://www.tachyonix.co.jp info@tachyonix.co.jp www.irf.com 26 Output Inductor Specification: Core: Wire: # Turns: Nominal Inductance: Finish: T94-2 from Micrometals 22 AWG 48 18uH No varnish or dipping of core required 187.5mil radius 2x 60mil holes 375mil 1120mil Suggested PCB footprint for custom output inductor Voltage Regulator Mounting: Item Description 1 2 3 4 7 Insulator Thermalfilm Shoulder Washer Flat Washer #4 No. 4-40 UNC-2B Hex Nut No. 4-40 UNC-2A X 1/2 Long Phillips Pan Head Screw Lockwasher, No.4 Heatsink PCB 5 6 7 8 8 www.irf.com 27 Daughter Board: IRAUDAMP3 DAUTHER-BOARD BILL OF MATERIAL NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Designator C1, C2 C3, C4 C5, C6 C7, C8, C20, R15, R16 C16, C17, C18, C19 C9, C21, C22 C10, C12, C14, C15 C11, C13 D1, D2, D3, D4 D5, D6 DS2 J1 J2 Q1 Q2, Q7 Q3, Q4, Q5, Q6 R1, R2 R3, R4 R5, R6 R7, R8 R9, R10 R11, R31, R33, R35, R40, R41 R12 R13, R14 R17, R18 R19, R20 R21, R22, R24, R39 R23, R26, R27, R28, R29, R30 R25, R32 R36 R37, R38 Rp1, Rp2 TP1, TP2 U1, U2 # 2 2 2 5 5 3 4 2 4 2 1 2 2 1 2 4 2 2 2 2 2 6 1 2 2 2 4 6 2 1 2 2 2 2 Footprint 0805 1206 1206 0805 0805 0805 1206 0805 SOD-123 SMB LED CON EISA31 CON_POWER SOT23-BCE SOT23-BCE DirectFet 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 0805 TP SO-14 Part Type 100pF 2.2uF, 16V 0.33uF, 25V OPEN 10nF 47nF 0.1uF 0.1uF 1N4148 MURA120T30SCT 160-1414-1 CON EISA31 CON_POWER MMBT3904 MMBT5401 IRF6645 0R 100R 3.3K 10.0K ,1% 10R 100K 4.7K 8.2K 1.74K,1% 1.30K, 1% 1K 4.7R 47K 10K 1R 100C TP IRS20124S Part No PCC101CGCT-ND PCC1898CT-ND PCC1889CT-ND OPEN PCC103BNCT-ND PCC1836CT-ND PCC2239CT-ND PCC1840CT-ND 1N4148WDICT-ND MURA120T3OSCT-ND 160-1414-1-ND A26568-ND A26570-ND MMBT3904DICT-ND MMBT5401DICT-ND IRF6645 P0.0ACT-ND P100ACT-ND P3.3KACT-ND P10.0KCCT-ND P10ACT-ND P100KACT-ND P4.7KACT-ND P8.2KACT-ND P1.74KCCT-ND P1.30KCCT-ND P1.0KACT-ND P4.7ACT-ND P47KACT-ND P10KACT-ND P1.0ACT-ND 594-2322-675-21007 OPEN IRS20124S Vendor Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey IR Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey Digikey MOUSER IR www.irf.com 28 IRAUDAMP3 PCB Specifications Motherboard: Material: Layer Stack: Dimensions: Solder Mask: Plating: Silkscreen: FR4, UL 125°C 1 Layer, 2 oz. Cu 5.014” x 13.685” x 0.062” LPI Solder mask, SMOBC on top and bottom layers Open copper solder finish On top and bottom layers Daughter-board layer stack Daughter-board: Material: Layer Stack: Dimensions: Solder Mask: Plating: Silkscreen: FR4, UL 125°C 2 Layers, 2 oz. Cu each, through-hole plated 3.127” x 1.492” x 0.062” LPI Solder mask, SMOBC on top and bottom layers (BLACK) Open copper solder finish On top and bottom layers (RED) www.irf.com 29 IRAUDAMP3 PCB Layers Motherboard: Bottom layer and pads (1 of 2) www.irf.com 30 Bottom layer and pads (2 of 2) www.irf.com 31 Bottom-side solder-mask and silkscreen (1 of 2) www.irf.com 32 Bottom-side solder-mask and silkscreen (2 of 2) www.irf.com 33 4.0 Top-side solder-mask and silkscreen (1 of 2) www.irf.com 34 www.irf.com 35 Top-side solder-mask and silkscreen (2 of 2) Daughter Board: PCB Layout – Top layer and pads PCB Layout – Top-side solder-mask and silkscreen www.irf.com 36 PCB Layout – Bottom layer and pads 4.0 PCB Layout – Bottom-side solder-mask and silkscreen www.irf.com 37 IRAUDAMP3 Mechanical Construction Motherboard 4.0 www.irf.com 38 Top and bottom sides of motherboard showing component locations Daughter Board Top side showing component locations 4.0 Bottom side showing connector locations Patent and Trademark Notice IR’s proprietary DirectFET® technology is covered by US Patents 6624522, 6784540 and multiple other US and foreign pending patent applications. IR®, HEXFET® and DirectFET® are registered trademarks of International Rectifier Corporation. All other product names noted herein may be trademarks of their respective holders. www.irf.com 39