International Rectifier IRAUDAMP10 Reference Manual

IRAUDAMP10 REV 1.1 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

IRAUDAMP10 REV 1.1 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

IRAUDAMP10 REV 1.1 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 (4Ω, 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: 300W x 2 channels (4Ω, THD+N=1%) or 370W x 2 channels (4Ω, THD+N=10%) Residual Noise: 220V, IHF-A weighted, AES-17 filter Distortion: 0.008% THD+N @ 100W, 4Ω Efficiency: 90% @ 300W, 4Ω, single-channel driven, Class D stage 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 with optional clock synchronization Specifications General Test Conditions (unless otherwise noted) Notes / Conditions Supply Voltages ±50V Load Impedance 4Ω Self-Oscillating Frequency 500kHz No input signal, Adjustable Gain Setting 30.8dB 1Vrms input yields rated power Electrical Data Typical Notes / Conditions IR Devices Used 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

IRAUDAMP10 REV 1.1 Rated Load Impedance 8-4Ω Resistive load Standby Supply Current +45/-95mA No input signal Total Idle Power Consumption 7W No input signal Channel Efficiency 90% Single-channel driven, 300W, Class D stage . Audio Performance Class D Output Notes / Conditions THD+N, 1W THD+N, 20W THD+N, 100W THD+N, 200W 0.015% 0.009% 0.008% 0.015% 1kHz, Single-channel driven Dynamic Range 100dB A-weighted, AES-17 filter, Single-channel operation Residual Noise, 22Hz - 20kHzAES17 220V Self-oscillating – 500kHz Damping Factor 51 1kHz, relative to 4Ω load Channel Separation 74dB 74dB 70dB 100Hz 1kHz 10kHz Frequency Response : 20Hz-20kHz : 20Hz-35kHz ±1dB ±3dB 1W, 4Ω - 8Ω Load Physical Specifications Dimensions 3.94”(L) x 2.83”(W) x 0.85”(H) 100 mm (L) x 72 mm (W) x 21.5 mm(H) Weight 0.130kgm

IRAUDAMP10 REV 1.1 Connection Setup Fig 1 Typical Test Setup Connector Description Pin # Pin Name Pin Description CN1 1 CH1 INPUT Analog input for CH1 2 GND Floating ground of Channel 1 input 3 GND Floating ground of Channel 2 input 4 CH2 INPUT Analog input for CH2 P1 1 -B -50V supply referenced to GND. 2 GND Ground signal from MB. 3 +B +50V supply referenced to GND. P2 1 CH2 OUTPUT Output of Channel 2 2 GND Floating ground of Channel 2 output P3 1 GND Floating ground of Channel 1 output 2 CH1 OUTPUT Output of Channel 1