IRAUDAMP10 300W x 2 Channel Class D Audio Power Amplifier Using the IRS2052M and IRF6775 By Jun Honda, Yasushi Nishimura and Liwei Zheng CAUTION: International Rectifier suggests the following guidelines for safe operation and handling of IRAUDAMP10 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 IRAUDAMP10 REV 1.1 Page 1 of 34 TABLE OF CONTENTS PAGE INTRODUCTION ............................................................................................................................................... 3 SPECIFICATIONS ............................................................................................................................................ 3 CONNECTION SETUP ..................................................................................................................................... 5 CONNECTOR DESCRIPTION ......................................................................................................................... 5 TEST PROCEDURES....................................................................................................................................... 6 PERFORMANCE AND TEST GRAPHS .......................................................................................................... 7 SOFT CLIPPING ............................................................................................................................................. 10 EFFICIENCY ................................................................................................................................................... 11 THERMAL CONSIDERATIONS ..................................................................................................................... 11 THERMAL INTERFACE MATERIAL'S PRESSURE CONTROL ................................................................................. 12 POWER SUPPLY REJECTION RATIO (PSRR) ............................................................................................ 14 SHORT CIRCUIT PROTECTION RESPONSE .............................................................................................. 15 IRAUDAMP10 OVERVIEW ............................................................................................................................ 16 FUNCTIONAL DESCRIPTIONS ..................................................................................................................... 18 IRS2052M GATE DRIVER IC ......................................................................................................................... 18 SELF-OSCILLATING FREQUENCY .................................................................................................................... 19 ADJUSTMENTS OF SELF-OSCILLATING FREQUENCY ......................................................................................... 19 INTERNAL CLOCK OSCILLATOR ....................................................................................................................... 19 SELECTABLE DEAD-TIME ................................................................................................................................ 20 PROTECTION SYSTEM OVERVIEW ............................................................................................................ 21 CLICK AND POP NOISE REDUCTION ......................................................................................................... 23 BUS PUMPING ............................................................................................................................................... 24 INPUT SIGNAL AND GAIN SETTING ........................................................................................................... 24 GAIN SETTING ............................................................................................................................................... 25 IRAUDAMP10 FABRICATION MATERIALS ................................................................................................. 27 IRAUDAMP10 PCB SPECIFICATIONS ......................................................................................................... 31 REVISION CHANGES DESCRIPTIONS ........................................................................................................ 34 www.irf.com IRAUDAMP10 REV 1.1 Page 2 of 34 Introduction The IRAUDAMP10 Demo board is a reference design which uses only one IC (IRS2052M) to derive appropriate input signals, amplify the audio input, and achieve a two-channel 280 W/ch (4, THD+N=1%) half-bridge Class D audio power amplifier. The reference design demonstrates how to use the IRS2052M Class D audio controller and gate driver IC, implement protection circuits, and design an optimum PCB layout using IRF6775 DirectFET MOSFETs. The reference design contains all the required housekeeping power supplies for ease of use. The two-channel design is scalable, for power and number of channels. Applications AV receivers Home theater systems Mini component stereos Powered speakers Sub-woofers Musical Instrument amplifiers Automotive after market amplifiers Features Output Power: Residual Noise: Distortion: Efficiency: Multiple Protection Features: PWM Modulator: 300W x 2 channels (4, THD+N=1%) or 370W x 2 channels (4, THD+N=10%) 220V, IHF-A weighted, AES-17 filter 0.008% THD+N @ 100W, 4 90% @ 300W, 4, single-channel driven, Class D stage 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) Self-oscillating half-bridge topology with optional clock synchronization Specifications General Test Conditions (unless otherwise noted) Supply Voltages 50V Load Impedance 4 Self-Oscillating Frequency 500kHz Gain Setting 30.8dB Notes / Conditions No input signal, Adjustable 1Vrms input yields rated power Electrical Data IR Devices Used Typical Notes / Conditions IRS2052M Audio Controller and Gate-Driver, IRF6775 DirectFET MOSFETs Modulator Self-oscillating, second order sigma-delta modulation, analog input Power Supply Range 25V to 50V Bipolar power supply Output Power CH1-2: (1% THD+N) 300W 1kHz, 50V Output Power CH1-2: (10% THD+N) 370W 1kHz, 50V www.irf.com IRAUDAMP10 REV 1.1 Page 3 of 34 Rated Load Impedance Standby Supply Current Total Idle Power Consumption Channel Efficiency 8-4 +45/-95mA 7W 90% Resistive load No input signal No input signal Single-channel driven, 300W, Class D stage . Audio Performance Class D Output THD+N, 1W THD+N, 20W THD+N, 100W THD+N, 200W 0.015% 0.009% 0.008% 0.015% Dynamic Range 100dB Residual Noise, 22Hz - 20kHzAES17 220V Damping Factor Channel Separation 51 74dB 74dB 70dB 1dB 3dB Frequency Response : 20Hz-20kHz : 20Hz-35kHz Physical Specifications Dimensions Notes / Conditions 1kHz, Single-channel driven A-weighted, AES-17 filter, Single-channel operation Self-oscillating - 500kHz 1kHz, relative to 4 load 100Hz 1kHz 10kHz 1W, 4 - 8 Load Weight 3.94"(L) x 2.83"(W) x 0.85"(H) 100 mm (L) x 72 mm (W) x 21.5 mm(H) 0.130kgm www.irf.com IRAUDAMP10 REV 1.1 Page 4 of 34 Connection Setup Fig 1 Typical Test Setup Connector Description CN1 P1 P2 P3 www.irf.com Pin # 1 2 3 4 1 2 3 1 2 1 2 Pin Name CH1 INPUT GND GND CH2 INPUT -B GND +B CH2 OUTPUT GND GND CH1 OUTPUT Pin Description Analog input for CH1 Floating ground of Channel 1 input Floating ground of Channel 2 input Analog input for CH2 -50V supply referenced to GND. Ground signal from MB. +50V supply referenced to GND. Output of Channel 2 Floating ground of Channel 2 output Floating ground of Channel 1 output Output of Channel 1 IRAUDAMP10 REV 1.1 Page 5 of 34 Test Procedures Test Setup: 1. Connect 4-200 W dummy loads to 2 output connectors (P2 and P3 as shown on Fig 1) and an Audio Precision analyzer (AP). 2. Connect the Audio Signal Generator to CN1 for CH1~CH2 respectively (AP). 3. Set up the dual power supply with voltages of 50V; current limit to 5A. 4. TURN OFF the dual power supply before connecting to On of the unit under test (UUT). 5. Connect the dual power supply to P1. as shown on Fig 1 Power up: 6. Turn ON the dual power supply. The B supplies must be applied and removed at the same time. 7. One orange and two blue LED should turn ON immediately and stay ON 8. Quiescent current for the positive supply should be 45mA 10mA at +50V. 9. Quiescent current for the negative supply should be 95mA 10mA at -50V. Switching Frequency test 10. With an Oscilloscope, monitor the switching waveform at test points VS1~VS2. Adjust VR1A and VR1B to set the self oscillating frequency to 500 kHz 25 kHz when DUT in free oscillating mode. Functionality Audio Tests: 11. Set the signal generator to 1kHz, 20 mVRMS output. 12. Connect the audio signal generator to CN1(Input of CH1,CH2,CH3) 13. Sweep the audio signal voltage from 15 mVRMS to 1 VRMS. 14. Monitor the output signals at P2/P3 with an oscilloscope. The waveform must be a non distorted sinusoidal signal. 15. Observe that a 1 VRMS input generates an output voltage of 34.88 VRMS(CH1/CH2). The ratio, R4x/(R3x) and R30x/(R31x), determines the voltage gain of IRAUDAMP10. Test Setup using Audio Precision (Ap): 16. Use an unbalanced-floating signal from the generator outputs. 17. Use balanced inputs taken across output terminals, P2 and P3. 18. Connect Ap frame ground to GND at terminal P1. 19. Select the AES-17 filter(pull-down menu) for all the testing except frequency response. 20. Use a signal voltage sweep range from 15 mVRMS to 1.5 VRMS. 21. Run Ap test programs for all subsequent tests as shown in Fig 2- Fig 7below. www.irf.com IRAUDAMP10 REV 1.1 Page 6 of 34 Performance and test graphs 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 2 5 10 20 50 100 200 500 W S w eep Tra c e C o lo r L in e S t y le Th ic k D ata A x is C om m ent 1 1 1 3 B lu e M agenta S o lid S o lid 2 2 A n lr. TH D + N R a t io A n lr. TH D + N R a t io L e ft L e ft CH2 CH1 B Supply = 50V, 4 Resistive Load Fig 2 IRAUDAMP10, THD+N versus Power, Stereo, 4 . +4 T +2 +0 d B r -2 -4 A -6 -8 -10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k 200k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Blue Magenta Solid Solid 2 2 Anlr.Level B Anlr.Level A Left Left CH2 CH1 B Supply = 50V, 4 Resistive Load Fig 3 IRAUDAMP10, Frequency response www.irf.com IRAUDAMP10 REV 1.1 Page 7 of 34 100 10 1 0.1 % 0.01 0.001 0.0001 20 50 100 200 500 1k 2k 5k 10k 20k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 1 1 1 Green Yellow Red Solid Solid Solid 2 2 2 Anlr.THD+N Ratio Anlr.THD+N Ratio Anlr.THD+N Ratio Left Left Left 10W 50W 100W Fig 4 THD+N Ratio vs. Frequency +0 -10 -20 -30 -40 d B V -50 -60 -70 -80 -90 -100 -110 10 20 50 100 200 500 1k 2k 5k Hz S weep Trac e Color Line S ty le Thic k Data A x is Com m ent 1 1 1 2 B lue M agenta S olid S olid 2 2 F ft.Ch.1 A m pl F ft.Ch.2 A m pl Left Left CH2 CH1 Fig 5, 1V output Frequency Spectrum www.irf.com IRAUDAMP10 REV 1.1 Page 8 of 34 +20 +0 -20 -40 d B V -60 -80 -100 -120 -140 10 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis Comment 1 1 1 2 Blue Magenta Solid Solid 2 2 Fft.Ch.1 Ampl Fft.Ch.2 Ampl Left Left CH2 CH1 No signal, Self Oscillator @ 500kHz Fig 6, IRAUDAMP10 Noise Floor . +0 -10 -20 -30 d B r A -40 -50 -60 -70 -80 -90 -100 20 50 100 200 500 1k 2k 5k 10k 20k Hz S weep Trac e Color Line S ty le Thic k Data A x is Com m ent 1 1 1 2 B lue M agenta S olid S olid 2 2 A nlr.A m pl A nlr.A m pl Left Left CH2-CH1 CH1-CH2 Fig 7, Channel separation vs. frequency . www.irf.com IRAUDAMP10 REV 1.1 Page 9 of 34 Soft Clipping IRS2052M has Clipping detection function, it monitors error voltage in COMP pin with a window comparator and pull an open drain nmos referenced to GND. Threshold to detect is at 10% and 90% of VAA-VSS. Each channel has independent CLIP outputs. Once IRS2052M detects Clipping, the CLIP pin can generate pulses to trigger soft clipping circuit, which can limit output's maximum power as Fig 9(soft clipping circuit is not available on AMP10 reference board). Soft Clipping R28A 1K C15A 10uF, 16V R29A 220K D3A 1N4148 Audio signal INPUT R27A C6A 1uF,50V R5A 47K GND R6A 47K CLIP Detection D C0A R7A 470K Q5 VAA DTA144EKA 10uF,50V 3.3K S G Q6 MMBFJ112 R3A 1K IN- C5A 10uF, 50V VSS GND Fig 9 Soft Clipping Circuit www.irf.com IRAUDAMP10 REV 1.1 Page 10 of 34 Efficiency Fig 10 shows efficiency characteristics of the IRAUDAMP10. The high efficiency is achieved by following major factors: 1) Low conduction loss due to the DirectFETs offering low RDS(ON) 2) Low switching loss due to the DirectFETs offering low input capacitance for fast rise and fall times Secure dead-time provided by the IRS2052M, avoiding cross-conduction. Efficiency (%) 100% 90% Efficiency (%) 80% 70% 60% AMP10 50V 4ohms 50% 40% 30% 20% 10% 0% 0 50 100 150 200 250 Output power (W) 300 350 Fig 10, IRAUDAMP10 4 ohms load Stereo, B supply = 50V Thermal Considerations With this high efficiency, the IRAUDAMP10 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 heatsinks or forced air-cooling. www.irf.com IRAUDAMP10 REV 1.1 Page 11 of 34 Thermal Interface Material's Pressure Control The pressure between DirectFET & TIM (Thermal Interface Material) is controlled by depth of Heat Spreader's groove. Choose TIM which is recommended by IR. (Refer to AN-1035 for more details). TIM's manufacturer thickness, conductivity, & etc. determine pressure requirement. Below shows selection options recommended: Fig 11 TIM Information www.irf.com IRAUDAMP10 REV 1.1 Page 12 of 34 Check the TIM's compression deflection with constant rate of strain (example as Fig.12) base on manufacturer's datasheet. According to the stress requirement, find strain range for the TIM. Then, calculate heat spreader groove depth as below: Groove Depth=DirectFET's Height +TIM's Thickness*strain **DirectFET's height should be measured from PCB to the top of DirectFET after reflow. The average height of IRF6775 is 0.6mm. Fig 12 compression deflection with constant rate of strain www.irf.com IRAUDAMP10 REV 1.1 Page 13 of 34 Power Supply Rejection Ratio (PSRR) The IRAUDAMP10 obtains good power supply rejection ratio of -60 dB at 1kHz shown in Fig 13. With this high PSRR, IRAUDAMP10 accepts any power supply topology when the supply voltages fit between the min and max range. +0 -10 -20 -30 d B -40 -50 -60 -70 -80 -90 20 50 100 200 500 1k 2k 5k 10k 20k 40k Hz Sweep Trace Color Line Style Thick Data Axis 2 1 Red Solid 2 Anlr.Ratio Left Comment Fig 13 Power Supply Rejection Ratio (PSRR) www.irf.com IRAUDAMP10 REV 1.1 Page 14 of 34 Short Circuit Protection Response Figs 14-15 show over current protection reaction time of the IRAUDAMP10 in a short circuit event. As soon as the IRS2052M detects an over current condition, it shuts down PWM. After one second, the IRS2052M tries to resume the PWM. If the short circuit persists, the IRS2052M repeats try and fail sequences until the short circuit is removed. Short Circuit in Positive and Negative Load Current CSD pin CSD pin VS pin VS pin Load current Load current Positive OCP Negative OCP Fig 14 Positive and Negative OCP Waveforms . OCP Waveforms Showing CSD Trip and Hiccup CSD pin CSD pin VS pin VS pin Load current Load current Fig 15 OCP Response with Continuous Short Circuit www.irf.com IRAUDAMP10 REV 1.1 Page 15 of 34 IRAUDAMP10 Overview The IRAUDAMP10 features a 2CH self-oscillating type PWM modulator for the smallest space, highest performance and robust design. This topology represents an analog version of a secondorder sigma-delta modulation having a Class D switching stage inside the loop. The benefit of the sigma-delta modulation, in comparison 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 modulation allows a designer to apply a sufficient amount of error correction. The IRAUDAMP10 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 16 below, the input operational amplifier of the IRS2052M forms a front-end second-order integrator with R3x, C2x, C3x, and R2x. The integrator that receives a rectangular feedback signal from the PWM output via R4x and audio input signal via R3x generates a quadratic carrier signal at the 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 at the COMP pin is converted to a PWM signal by an internal comparator that has a threshold at middle point between VAA and VSS. The comparator 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. www.irf.com IRAUDAMP10 REV 1.1 Page 16 of 34 Gate Drivers and DirectFETs 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 DirectFETs. The high-side levelshifter shifts up the high-side gate drive signal out of the dead-time block. Each channel of the IRS2052M's drives two DirectFETs, high- and low-sides, in the power stage providing the amplified PWM waveform. Output LPF The amplified PWM output is reconstructed back to an analog signal by the output LC LPF. Demodulation LC low-pass filter (LPF) formed by L1 and C13, 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 500 kHz and greater; a design with a lower switching frequency may require an additional stage of LPF. Fig 16 Simplified Block Diagram of IRAUDAMP10 Class D Amplifier www.irf.com IRAUDAMP10 REV 1.1 Page 17 of 34 Functional Descriptions IRS2052M Gate Driver IC The IRAUDAMP10 uses the IRS2052M, a 2 Channel 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 IRS2052M 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, R12 and R13 as shown on Fig 17 or Fig 23 below. The IRS2052M offers the following functions. PWM modulator Dead-time insertion Over current protection Under voltage protection Level shifters Refer to IRS2052M datasheet and AN-1159 for more details. L1A CH3 OUTPUT 18 C14A 0.1uF, 63V C14B R21B 10R,1W 2.2K CH1 OUTPUT 4.7R R17B R15B 10K *** R71B 10K Q1B,D IRF6665/6775M +B C19B 1k R9B S1 3way SW C15 N/A XTAL C17A 470uF,63V GND R23B 100k C17D 0.1uF,100V C17B 470uF,63V -B 10R Q2B,D IRF6665/6775M VSS R23A 100k C17C 0.1uF,100V 1R 22uF,16V 3.9K 13 R19B R16B 14 0.1uF,100V 15 10R C11 C12 C13 C14 330pF 330pF 330pF 330pF R24B 22uH DS5 XTAL VAA VAA GND L1B RF071M2STR R18B D2B 16 NC R106 2 0.47uF, 400V C13B C9B 10uF,16V R14B 4.7R 19 17 12 9 11 R52 1K 2 1R 4.7R D2A RF071M2STR 21 Y2 Y1 C19A R19A DS4 R18A 0.1uF,100V D1A RF071M2STR Q2A,C IRF6665/6775M 20 R22B *** R51 1K R21A 0.1uF, 63V 10R,1W C10A 22uF,16V 3.9K 22 C10B 27 25 NC 28 26 NC NC OTP VS2 VS1 NC XSL X2A 23 R71A 10K R12B N/A R107 3.9K DS2 SD GND 10R R15A *** R17A 10K R16A R20B 1 D4 1N4148 10R D1B RF071M2STR 8.2K 0 -B NC 1 0.47uF, 400V C13A R22A *** 2.2K R12 C16A 0.01uF 29 COM 30 31 34 33 HO1 NC R12A N/A R20A R9A 24 R108 3.9K C8 10uF, 16V R14 10R D3 CSD 32 35 VB1 CSD R22 10R R4B 100K DT CSH1 NC 4.7uF,10V R15 10R LO1 CLIP1 1N4148 4.7uF,10V GND VCC2 COMP1 C9 GND LO2 COM2 IN1 10 47 DSB -B VAA R104 C10 C12B 220pF VSS X2B 46 R26B 10K 48 R0B 100K CSH2 IRS2052M 8 C2B 2.2nF,50V 45 VCC R11 *** 44 IC1 GND 7 R27B VAA 43 VB2 IN2 X1A VR1B 200R 3.3K VSS 42 4.7uF,10V RpA 90C HO2 COMP2 6 15K 4.7uF,10V C7 C3B 2.2nF,50V R32A 10R CLIP2 X1B R30B 10K C6 1nF,50V C4B R2B 120R GND NC 5 R7 10R 41 NC NC 36 R3B 1K NE5532AN R31B 39 CKO C5B 10uF, 50V R6 10R FAULT R3A 1K OTW 5 6 7 8 GND 2IN+ 1IN+ 2IN1IN- 2OUT 1OUT VDD C0B 10uF,50V 38 C4A 1nF,50V 40 C5A 10uF, 50V 1 4 3 2 1 GND 4 3 2 1 VR1A 200R R2A 120R GND NC 10K 2 CH2 GND GND CH1 C8B 470pF IC3 37 DSA C3A 2.2nF,50V 4 C8A 470pF 3.3K C0A 10uF,50V CN1 10K 10K 3 C2A 2.2nF,50V R27A R30A 15K VREF R26A R31A 10K R105 R0A 100K OCSET R4A 100K C12A 220pF DS3 GND R24A 2.2K Q1A,C IRF6665/6775M R13 1K C9A 10uF,16V R10 22uH R14A 4.7R VAA P2 CH2 OUTPUT GND C62 +5v R45 10k 0.01uF, 50V R43 470R,1W CH2 P1 R47 470R,1W -B GND +B R62 10k C40 220uF/10V GND 1 2 Q8 MJD44H11T4G Z5 5.6V 1 2 3 GND R54 10k For EMI R57 47k P3 R50 47k R36 100R,1W GND CH1 OUTPUT R56 47k S2 Z6 5.6V C41 220uF/10V Q9 -5v R46 10k MJD45H11T4G Z3 *** R53 10k Q4 MMBT5551 Q3 MMBT5551 R44 R48 470R,1W 470R,1W Z4 24V R58 47k R55 47k OVP R31 10k Q1 MJD44H11T4G R39 100R,1W CH1 DS1 C32 100uF, 25V Z1 12V R41 10k R40 10k UVP D1A, D1B D1C, D1D R11 R15A, R15B R22A, R22B Z3 IRF6665 Version Q1A, Q1B, Q1A, Q1B 1N4148 8.2k 10k 22k 39V IRF6775M Version Q1C, Q1D, Q2C, Q2D RF071M2 5.6k 5.6k 33k 51V Fig 17 System-level View of IRAUDAMP10 www.irf.com 1 2 R37 100R,1W R38 100R,1W IRAUDAMP10 REV 1.1 Page 18 of 34 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 IRS2052M, the DirectFETs switching speed, the timeconstant of front-end integrator (R2x, R3x, R4x, Vr1x, C2x, C3x ). 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 VR1x 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 frequency and frequency relative to the other channels. In 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 500kHz in the IRAUDAMP10. Internal Clock Oscillator The IRS2052M integrates two clock oscillators and synchronization networks for each PWM channel. To prevent AM radio reception interference, two PWM frequencies are selectable via XSL pin. As shown in Table 2, when XSL is bias to VAA, X1A and X1B are active. When XSL is GND X2A and X2B are active. When XSL is VSS, both clock oscillators are disabled. XSL pin VAA GND VSS X1A/B Activated Disabled Disabled X2A/B Disabled Activated Disabled CKO outputs internal clock with VAA/VSS amplitude. The CKO can distribute clock signal to multiple IRS2052 devices to synchronize PWM switching timing. www.irf.com IRAUDAMP10 REV 1.1 Page 19 of 34 Selectable Dead-time The dead-time of the IRS2052 is set based on the voltage applied to the DT pin. Fig 18 lists the suggested component value for each programmable dead-time between 45 and 105 ns. All the IRAUDAMP10 models use DT1 (45ns) dead-time. Dead-time Mode DT1 DT2 DT3 DT4 R1 <10k 5.6k 8.2k Open R2 Open 4.7k 3.3k <10k DT/SD Voltage Vcc 0.46 x Vcc 0.29 x Vcc COM Recommended Resistor Values for Dead Time Selection Dead- time IRS2052M 45nS >0.5mA 65nS Vcc R1 85nS DT 105nS R2 0.23xVcc 0.36xVcc 0.57xVcc Vcc VDT COM Fig 18 Dead-time Settings vs. VDT Voltage www.irf.com IRAUDAMP10 REV 1.1 Page 20 of 34 Protection System Overview The IRS2052M integrates over current protection (OCP) inside the IC. The rest of the protections, such as over-voltage protection (OVP), under-voltage protection (UVP), and over temperature protection (OTP), are detected externally to the IRS2052M (Fig 19). The external shutdown circuit will disable the output by pulling down CSD pins, (Fig 20). If the fault condition persists, the protection circuit stays in shutdown until the fault is removed. GND OTP pin from IRS2052M SD R54 10k R57 47k R50 47k R56 47k R32A 10R Z3 *** Z4 24V R53 10k Q4 MMBT5551 Q3 MMBT5551 RpA 90C R58 47k R55 47k OVP C16A 0.01uF -B UVP OTP Fig 19 DCP, OTP, UVP and OVP Protection Circuits . Fig 20 Simplified Functional Diagram of OCP www.irf.com IRAUDAMP10 REV 1.1 Page 21 of 34 Over-Current Protection (OCP) Low-Side Current Sensing The low-side current sensing feature protects the low side DirectFET from an overload condition from negative load current by measuring drain-to-source voltage across RDS(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 threshold for low-side over-current sensing. When the VS voltage becomes higher than the OCSET voltage during low-side conduction, the IRS2052 turns the outputs off and pulls CSD down to -VSS. High-Side Current Sensing The high-side current sensing protects the high side DirectFET from an overload condition from positive load current by measuring drain-to-source voltage across RDS(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 DirectFET during 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 DirectFET. In contrast to the low-side current sensing, the threshold of the CSH pin to trigger OC protection is internally fixed at 1.2V. An external resistive divider R15, R16 and R17 are used to program a threshold as shown in Fig 20. An external reverse blocking diode D1 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 D1, the minimum threshold which can be set for the high-side is 0.6V across the drain-to-source. Over-Voltage Protection (OVP) OVP is provided externally to the IRS2052M. OVP shuts down the amplifier if the bus voltage between GND and -B exceeds 51V. The threshold is determined by a Zener diode Z3. OVP 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 IRS2052M. 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 Z4. Offset Null (DC Offset) Adjustment The IRAUDAMP10 requires no output-offset adjustment. DC offsets are tested to be less than 20 mV. www.irf.com IRAUDAMP10 REV 1.1 Page 22 of 34 Over-Temperature Protection (OTP) The over temperature protection input OTP is for an external PTC Thermistor to monitor temperature of MOSFET. The OTP pin equips a 0.6mA internal current source to bias the external PTC resistor. Over temperature warning activates when the voltage at any of OTP input pin goes higher than 1.4V. Over temperature protection activates when the voltage at any of OTP input pin goes higher than 2.8V. A PTC thermistors, Rpa in Fig 19, is placed on bottom side PCB; which is close to the 4 DirectFETs; and monitors DirectFETs' temperature. If the temperature rises above 90 C on the bottom side, make OTP input pin goes high and shuts down all 2 channels by pulling down the CSD pins of the IRS2052M. OTP recovers once the temperature cools down. On-chip Over Temperature Protection If the junction temperature TJ of IRS2052M becomes higher than on-chip thermal warning threshold 127C, the on-chip over temperature protection pulls OTW pin down to GND. If the junction temperature TJ keeps increasing and exceed on-chip thermal shutdown threshold 147C, the on-chip over temperature protection shuts down PWM, pulls OTW up to VAA and pulls FAULT pin down to GND as long as the junction temperature is higher than the threshold. Over Temperature Warning Output (OTW) OTW output is an open drain output referenced to GND to report whether the IRS2052M is experiencing high temperature from either OTP input or on-chip OTP. OTW activates if OTP pin voltage becomes higher than warning threshold, or if junction temperature reaches warning threshold. Fault Output FAULT output is an open drain output referenced to GND to report whether the IRS2052M is in shutdown mode or in normal operating condition. If FAULT pin is open, the IRS2052M is in normal operation mode. Following conditions triggers shutdown internally and pulls FAULT pin down to GND. * Over Current Protection * Over Temperature Protection (internal or external via OTP pin) * Shutdown mode from CSD pin voltage Click and POP Noise Reduction Thanks to the click and pop elimination function built into the IRS2052M, the IRAUDAMP10 does not require any additional components for this function. www.irf.com IRAUDAMP10 REV 1.1 Page 23 of 34 Power Supply Requirements For convenience, the IRAUDAMP10 has all the necessary housekeeping power supplies onboard and only requires a pair of symmetric power supplies. House Keeping Power Supply The internally-generated housekeeping power supplies include 5V for analog signal processing, and +12V supply (VCC) referred to the negative supply rail -B for DirectFET gate drive. The gate driver section of the IRS2052M uses VCC to drive gates of the DirectFETs. VCC is referenced to - B (negative power supply). D2x, R18x and C10x form a bootstrap floating supply for the HO gate driver. Bus Pumping When the IRAUDAMP10 is running in stereo mode, the 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 IRAUDAMP10 from failure in case of excessive bus pumping. Bus voltage detection monitors only +B supply, assuming the bus pumping on the supplies is symmetric in +B and -B supplies. Load Impedance Each channel is optimized for a 4 speaker load in half bridge. Input Signal and Gain Setting A proper input signal is an analog signal ranging from 20Hz to 20kHz with up to 3 VRMS 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. www.irf.com IRAUDAMP10 REV 1.1 Page 24 of 34 The IRAUDAMP10 has an RC network called a Zobel network (R21 and C14) to damp the resonance and prevent peaking frequency response with light loading impedance. (Fig 21) Fig 21 Output Low Pass Filter and Zobel Network Gain Setting The ratio of resistors {R4x/(R3x+R27x)}*(R30x/R31x) in Fig 22 sets voltage gain. The IRAUDAMP10 has no on board volume control. To change the voltage gain, change the input resistor term R27x and R3x. Changing R4x affects PWM control loop design and may result poor audio performance. www.irf.com IRAUDAMP10 REV 1.1 Page 25 of 34 Schematic L1A CH3 OUTPUT C9B 10uF,16V R14B 4.7R 19 16 C14A 0.1uF, 63V +B 10R R22B *** S1 3way SW C17A 470uF,63V GND R23B 100k C17D 0.1uF,100V C17B 470uF,63V -B 10R Q2B,D IRF6665/6775M VSS R23A 100k C17C 0.1uF,100V 1R Q1B,D IRF6665/6775M 1k C11 C12 C13 C14 330pF 330pF 330pF 330pF C14B R71B 10K R19B R17B R15B 10K *** 0.1uF,100V 13 D1B RF071M2STR 3.9K 22uF,16V R16B 14 XTAL VAA VAA R21B 10R,1W CH1 OUTPUT 4.7R 15 C15 N/A 2 2.2K R12B N/A R107 3.9K SD Y2 R24B DS5 RF071M2STR R18B D2B 17 R9B XTAL 2 GND L1B 22uH R108 3.9K DS2 D4 1N4148 Y1 0.47uF, 400V C13A 20 18 12 1 1 1 R106 0.47uF, 400V C13B 4.7R D2A RF071M2STR 21 C19B R52 1K 1R D1A RF071M2STR DS4 R18A 0.1uF,100V 3.9K 22 Q2A,C IRF6665/6775M C19A R19A GND 10R R71A 10K R20B R51 1K R21A 0.1uF, 63V 10R,1W C10A 22uF,16V R9A 23 C10B 26 27 25 NC NC VS2 10R R15A *** R17A 10K R16A 24 NC VS1 NC R12A N/A R20A R22A *** 8.2K R12 C16A 0.01uF 30 29 28 NC COM OTP 31 32 0 NC C8 10uF, 16V R14 10R D3 CSD R15 10R DT -B NC R22 10R R4B 100K GND VCC HO1 C9 4.7uF,10V 34 CSD R104 4.7uF,10V GND VB1 NC 47 CSH1 CLIP1 1N4148 C10 C12B 220pF LO1 COMP1 46 48 R0B 100K OCSET IN1 45 DSB LO2 VCC2 11 3.3K C3B 2.2nF,50V R26B 10K VAA COM2 10 R2B 120R VR1B 200R C2B 2.2nF,50V R27B -B XSL 15K CSH2 IRS2052M VSS X2A R30B 10K IC1 GND X2B C0B 10uF,50V R31B R3B 1K VAA C7 43 4.7uF,10V 44 1nF,50V C4B 9 C5B 10uF, 50V VSS 42 8 NE5532AN 4.7uF,10V 7 R7 10R 41 C6 X1A R6 10R 33 R11 *** R3A 1K X1B C5A 10uF, 50V 6 GND VB2 5 5 6 7 8 GND 2IN+ 1IN+ 2IN1IN- 2OUT 1OUT VDD NC IN2 CKO 4 3 2 1 RpA 90C HO2 COMP2 40 GND R32A 10R CLIP2 39 FAULT IC3 GND 4 3 2 1 NC 38 C4A R2A 120R 1nF,50V 4 CN1 C8B 470pF 37 DSA C3A 2.2nF,50V 10K 3 C0A 10uF,50V 10K VR1A 200R DS3 C8A 470pF 3.3K OTW C2A 2.2nF,50V R27A R30A 15K 10K 2 R31A 10K 35 36 NC R26A NC C12A 220pF R0A 100K VREF R4A 100K R105 GND R24A 2.2K Q1A,C IRF6665/6775M R13 1K C9A 10uF,16V 2.2K R10 22uH R14A 4.7R VAA P2 CH2 OUTPUT GND C62 +5v R45 10k 0.01uF, 50V R43 470R,1W R47 470R,1W CH2 P1 -B GND +B R62 10k C40 220uF/10V GND 1 2 Q8 MJD44H11T4G Z5 5.6V 1 2 3 GND R54 10k For EMI R57 47k P3 R50 47k R36 100R,1W GND CH1 OUTPUT R56 47k S2 Z6 5.6V C41 220uF/10V Q9 -5v Z3 *** R53 10k Q4 MMBT5551 Q3 MMBT5551 R46 10k MJD45H11T4G R44 R48 470R,1W 470R,1W Z4 24V R58 47k R55 47k OVP R31 10k Q1 MJD44H11T4G IRAUDAMP10 REV 1.1 CH1 DS1 C32 100uF, 25V Z1 12V R41 10k R40 10k UVP Fig 22 IRAUDAMP10 Schematic www.irf.com R39 100R,1W 1 2 R37 100R,1W R38 100R,1W Page 26 of 34 D1A, D1B D1C, D1D R11 R15A, R15B R22A, R22B Z3 IRF6665 Version Q1A, Q1B, Q1A, Q1B 1N4148 8.2k 10k 22k 39V IRF6775M Version Q1C, Q1D, Q2C, Q2D RF071M2 5.6k 5.6k 33k 51V IRAUDAMP10 Fabrication Materials Table 1 IRAUDAMP10 Electrical Bill of Materials Quantity Value 4 10uF, 50V 4 2.2nF,50V 2 1nF,50V 4 4.7uF,10V 1 10uF, 16V 2 470pF 2 10uF,16V 2 22uF,16V 4 330pF, 50V 2 220pF 2 0.47uF, 400V 2 0.1uF, 63V 2 0.01uF,50V 2 470uF,63V 4 0.1uF,100V 1 100uF, 25V 2 220uF, 10V 1 INPUT 4 RF071M2STR 2 1N4148 1 LED AMBER 2 LED RED 2 LED BLUE 2 LED GREEN 1 IRS2052M 1 NE5532AN 2 22uH 1 Header 3 2 SP OUT 2 MJD44H11T4G 4 IRF6775MPBF www.irf.com Description CAP 10UF 50V ELECT SMG RAD CAP CER 2200PF 50V 10% X7R 0603 CAP 1000PF 50V CERAMICX7R 0603 CAP CERM 4.7UF 10V Y5V 0805 CAP CER 10UF 16V Y5V 1206 Polypropylene Film Capacitors 100V 470pF 5% CAP CER 10UF 16V Y5V 0805 CAP CER 22UF 16V X7R 1210 CAP CER 330PF 50V X7R 0603 CAP CER 220PF 50V 10% X7R 0603 CAP .47UF 400V METAL POLYPRO CAP FILM MKP .1UF 63VDC 2% CAP CER 10000PF 50V 10% X7R 0603 CAP 470UF 63V ELECT SMG RAD CAP CER .10UF 100V X7R 10% 0805 CAP 100UF 25V ELECT SMG RAD CAP 220UF 10V ELECT SMG RAD TERMINAL BLOCK 3.5MM 4POS PCB DIODE 200V 700MA SOD123 DIODE SWITCH 100V 400MW SOD123 LED AMBER CLR THIN 0805 SMD LED SUPER RED CLEAR 0805 SMD LED 468NM BLUE CLEAR 0805 SMD LED GREEN CLEAR 0805 SMD Designator Part Number Vender C0A, C0B, C5A, C5B 565-1106-ND C2A, C2B, C3A, C3B 490-1500-1-ND United Chemi-Con Murata Electronics North America C4A, C4B 399-1082-1-ND Kemet C6, C7, C9, C10 478-1429-1-ND C8 490-3383-1-ND AVX Corporation Murata Electronics North America C8A, C8B 505-FKP2470/100/5 C9A, C9B 490-3347-1-ND WIMA Murata Electronics North America C10A, C10B 445-3945-1-ND TDK Corporation C11, C12, C13, C14 445-5074-1-ND C12A, C12B 490-1483-1-ND TDK Corporation Murata Electronics North America C13A, C13B 495-1315-ND C14A, C14B BC2054-ND C16A, C62 490-1512-1-ND EPCOS Inc Vishay/BC Components Murata Electronics North America C17A, C17B 565-1131-ND United Chemi-Con C17C, C17D, C19A, C19B 445-1418-1-ND TDK Corporation C32 565-1059-ND United Chemi-Con C40, C41 565-1021-ND CN1 ED1516-ND United Chemi-Con On Shore Technology Inc D1A, D1B, D2A, D2B RF071M2SCT-ND Rohm Semiconductor D3, D4 1N4148W-FDICT-ND Diodes Inc DS1 160-1419-1-ND Lite-On Inc DS2, DS3 160-1415-1-ND Lite-On Inc DS4, DS5 160-1645-1-ND Lite-On Inc DSA, DSB 160-1414-1-ND Lite-On Inc 2ch Audio Class D Controller IC OPAMP DUAL LOW NOISE 8-DIP IC1 IR2052MPBF International Rectifier IC3 NE5532ANGOS-ND Class D inductor, 22uH CONN TERM BLOCK PCB 5.0MM 3POS CONN TERM BLOCK PCB 5.0MM 2POS TRANS PWR NPN 8A 80V DPAK MOSFET, 150V, 28A, 47 mOhm, 25 nC Qg, Med Can, optimized for Audio L1A, L1B 7G17A-220M ON Semiconductor Inductors,Inc./SAGAMI ELEC CO., LTD. P1 281-1415-ND Weidmuller P2, P3 Weidmuller Q1, Q8 281-1414-ND MJD44H11T4GOSCTND ON Semiconductor Q1A, Q1B, Q2A, Q2B IRF6775MTR1PBF International Rectifier IRAUDAMP10 REV 1.1 Page 27 of 34 0 N/A 2 MMBT5551 1 MJD45H11T4G 4 100K 2 120R 2 1K 2 100K 10 10R 1 2.2K 3 5.6K 1 8.2K 0 N/A 5 1K 4 4.7R 3 3.9K 13 10K 2 1R 2 10R,1W 2 33K 2 2.2K 2 3.3K 2 15K 5 10K 4 100R,1W 4 470R,1W 5 47K 1 90C 1 3way SW 1 SW-PB 2 MOSFET, 100V, 19A, 62 mOhm, 8.7 nC Qg, Small Can, optimized for Audio TRANS NPN 160V 350MW SMD SOT23-3 TRANS PWR PNP 8A 80V DPAK RES 100K OHM 1/10W 5% 0603 SMD RES 120 OHM 1/10W 5% 0603 SMD RES 1.00K OHM 1/8W 1% 0805 SMD RES 100K OHM 1/8W 1% 0805 SMD RES 10 OHM 1/10W 5% 0603 SMD RES 2.2K OHM 1/10W 5% 0603 SMD RES 5.6K OHM 1/10W 5% 0603 SMD RES 8.2K OHM 1/10W 5% 0603 SMD RES 1.0K OHM 1/10W 5% 0603 SMD RES 4.7 OHM 1/10W 5% 0603 SMD RES 3.9K OHM 1/10W 5% 0603 SMD RES 10K OHM 1/10W 5% 0603 SMD RES 1.0 OHM 1/8W 5% 0805 SMD RES 10 OHM 1W 1% 2512 SMD RES 33.0K OHM 1/8W 1% 0805 SMD RES 2.2K OHM 1/8W 5% 0805 SMD RES 3.3K OHM 1/10W 5% 0603 SMD RES 15.0K OHM 1/8W 1% 0805 SMD RES 10.0K OHM 1/8W 1% 0805 SMD RES 100 OHM 1W 5% 2512 SMD RES 470 OHM 1W 5% 2512 SMD RES 47K OHM 1/10W 5% 0603 SMD Thermistors - PTC PTC Temp Prot. 90C SWITCH ROTARY SP-3POS SMD Q1C, Q1D, Q2C, Q2D Q9 IRF6665TR1PBF MMBT5551-FDICTND MJD45H11T4GOSCTND ON Semiconductor R0A, R0B, R23A, R23B RHM100KGCT-ND Rohm Semiconductor R2A, R2B RHM120GCT-ND Rohm Semiconductor R3A, R3B RHM1.00KCRCT-ND Rohm Semiconductor R4A, R4B R6, R7, R9A, R9B, R14, R15, R20A, R20B, R22, R32A RHM100KCRCT-ND Rohm Semiconductor RHM10GCT-ND Rohm Semiconductor R10 RHM2.2KGCT-ND Rohm Semiconductor R11, R15A, R15B RHM5.6KGCT-ND Rohm Semiconductor R12 RHM8.2KGCT-ND Rohm Semiconductor R12A, R12B N/A R13, R51, R52, R106, R108 RHM1.0KGCT-ND Rohm Semiconductor R14A, R14B, R18A, R18B RHM4.7GCT-ND Rohm Semiconductor R16A, R16B, R107 R17A, R17B, R26A, R26B, R45, R46, R53, R54, R62, R71A, R71B, R104, R105 RHM3.9KGCT-ND Rohm Semiconductor RHM10KGCT-ND Rohm Semiconductor R19A, R19B RHM1.0ARCT-ND Rohm Semiconductor R21A, R21B PT10AECT-ND Panasonic - ECG R22A, R22B RHM33.0KCRCT-ND Rohm Semiconductor R24A, R24B RHM2.2KARCT-ND Rohm Semiconductor R27A, R27B RHM3.3KGCT-ND Rohm Semiconductor R30A, R30B RHM15.0KCRCT-ND Rohm Semiconductor R31, R31A, R31B, R40, R41 RHM10.0KCRCT-ND Rohm Semiconductor R36, R37, R38, R39 PT100XCT-ND Panasonic - ECG R43, R44, R47, R48 PT470XCT-ND Panasonic - ECG R50, R55, R56, R57, R58 RHM47KGCT-ND RpA 594-2381-675-20907 Rohm Semiconductor Vishay/BC Components S1 Q3, Q4 International Rectifier Diodes Inc 401-1962-1-ND C&K Components S2 P8010S-ND Panasonic - ECG 200R VR 6MM LIGHT TOUCH SW H=5 POT 200 OHM 3MM CERM SQ TOP SMD VR1A, VR1B ST32ETB201CT-ND 1 XTAL CER RESONATOR 400KHz Y1 490-1186-ND 1 XTAL Y2 490-1187-ND 1 12V CER RESONATOR 455KHZ DIODE ZENER 12V 500MW SOD-123 Copal Electronics Inc Murata Electronics North America Murata Electronics North America Z1 BZT52C12-FDICT-ND Diodes Inc www.irf.com IRAUDAMP10 REV 1.1 Page 28 of 34 1 51V 1 24V 2 5.6V DIODE ZENER 51V 410MW SOD-123 DIODE ZENER 24V 500MW SOD-123 DIODE ZENER 5.6V 500MW SOD-123 Z3 BZT52C51-FDICT-ND Diodes Inc Z4 BZT52C24-FDICT-ND MMSZ5V6T1GOSCTND Diodes Inc Z5, Z6 ON Semiconductor Table 2 IRAUDAMP10 Mechanical Bill of Materials Quantity Value Description 7 Washer #4 SS WASHER LOCK INTERNAL #4 SS 1 PCB Print Circuit Board IRAUDAM11 Rev 3.0 .PCB PCB 1 7 Screw 440X5/16 SCREW MACHINE PHILLIPS 4-40X5/16 Screw 1, Screw 2, Screw 3, Screw 4, Screw 5, Screw 6, Screw 7, H343-ND 4 Stand off 0.5" STANDOFF HEX 440THR .500"L ALUM Stand Off 1, Stand Off 2, Stand Off 3, Stand Off 4 1893K-ND 1/16 AAVID 4880G THERMAL PAD .080" 4X4" GAPPAD thermal pad under heatsink BER164-ND www.irf.com Designator Lock washer 1, Lock washer 2, Lock washer 3, Lock washer 4, Lock washer 5, Lock washer 6 Lock washer 7 IRAUDAMP10 REV 1.1 Digikey P/N Vendor H729-ND Building Fasteners Custom Page 29 of 34 Building Fasteners Keystone Electronics Thermalloy IRAUDAMP10 Hardware Fig 23 Heat Spreader . Screw H343-ND Thermal Pad Th l d Lock washer Screw H343-ND Screw H343-ND Screw H343-ND Stand Off 3 1893K-ND Lock washer Lock washer Stand Off 2 Lock washer 1893K-ND Lock washer Lock washer Stand Off 4 1893K-ND Lock washers H729-ND Screw Screw Screw Stand Off 1 1893K-ND Screws H343-ND Fig 26 Hardware Assemblies www.irf.com IRAUDAMP10 REV 1.1 Page 30 of 34 IRAUDAMP10 PCB Specifications PCB: 1. 2. 3. 4. 5. 6. Two Layers SMT PCB with through holes 1/16 thickness 2/0 OZ Cu FR4 material 10 mil lines and spaces 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 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. .gtl 2. .gbl 3. .gto 4. .gbo 5. .gts 6. .gbs 7. .gko 8. .gm1 9. .gd1 10. .gg1 11. .txt 12. .apr Top copper, top side Bottom copper, bottom side Top silk screen Bottom silk screen Top Solder Mask Bottom Solder Mask Keep Out, Mechanical1 Drill Drawing Drill locations CNC data Apertures data Additional files for assembly that may not be related with Gerber files: 13. .pcb 14. .bom 15. .cpl 16. .sch 17. .csv 18. .net 19. .bak 20. .lib www.irf.com PCB file Bill of materials Components locations Schematic Pick and Place Components Net List Back up files PCB libraries IRAUDAMP10 REV 1.1 Page 31 of 34 Fig 27 IRAUDAMP10 PCB Top Overlay (Top View) www.irf.com IRAUDAMP10 REV 1.1 Page 32 of 34 Fig 28 IRAUDAMP10 PCB Bottom Layer (Top View) www.irf.com IRAUDAMP10 REV 1.1 Page 33 of 34 Revision changes descriptions Revision Rev 1.0 Rev 1.1 Changes description Released Correct polarity of XSL pin function in Internal Clock Oscillator Date March, 29 2011 Jan, 25 2012 WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 Data and specifications subject to change without notice. 01/29/2009 www.irf.com IRAUDAMP10 REV 1.1 Page 34 of 34