IRAUDAMP9 Infineon

IRAUDAMP9 1.7 kW / 2- Single Channel Class D Audio Power Amplifier Using the IRS2092S and IRFB4227 By Israel Serrano and Jun Honda CAUTION: International Rectifier recommends the following guidelines for safe operation and handling of IRAUDAMP9 demo board: Always wear safety glasses when operating demo board Avoid physical contact with exposed metal surfaces when operating the demo board Turn off demo board when placing or removing measurement probes www.irf.com IRAUDAMP9 REV 2.0 Page 1 of 39 TABLE OF CONTENTS PAGE INTRODUCTION............................................................................................................................................... 3 SPECIFICATIONS............................................................................................................................................ 3 CONNECTION SETUP AND DESCRIPTION ...............................................................................................5-6 TEST PROCEDURES ...................................................................................................................................... 6 PERFORMANCE AND TEST GRAPHS .......................................................................................................7-9 IRAUDAMP9 OVERVIEW .............................................................................................................................. 10 FUNCTIONAL DESCRIPTIONS................................................................................................................... 100 CLASS D OPERATION................................................................................................................................... 100 Gate Driver Buffer Stage 11 POWER SUPPLIES AND PSRR........................................................................................................................ 12 BUS PUMPING ............................................................................................................................................... 12 HOUSE KEEPING POWER SUPPLY................................................................................................................... 13 INPUT............................................................................................................................................................ 13 OUTPUT ........................................................................................................................................................ 13 HIGH OUTPUT PEAK SHUTDOWN (HOPS) CIRCUIT ......................................................................................... 13 GAIN SETTING / VOLUME CONTROL ................................................................................................................ 14 EFFICIENCY................................................................................................................................................... 14 OUTPUT FILTER DESIGN AND PREAMPLIFIER................................................................................................... 15 SELF-OSCILLATING PWM MODULATOR .......................................................................................................... 16 ADJUSTMENTS OF SELF-OSCILLATING FREQUENCY......................................................................................... 16 SWITCHES AND INDICATORS........................................................................................................................... 16 STARTUP AND SHUTDOWN ............................................................................................................................. 17 STARTUP AND SHUTDOWN SEQUENCING ........................................................................................................ 17 PROTECTION SYSTEM OVERVIEW................................................................................................................... 20 Ouput Over-Current Protection (OCP).................................................................................................... 20 Low-side Current Sensing ................................................................................................................. 20 High-side Current Sensing ................................................................................................................ 21 Input Bus Over-Voltage Protection (OVP) .............................................................................................. 21 Input Bus Under-Voltage Protection (UVP)............................................................................................. 22 Speaker DC-Offset- Protection (DCP) .................................................................................................... 21 Offset Null (DC Offset) Adjustment ......................................................................................................... 21 Over-Temperature Protection (OTP) ...................................................................................................... 22 Thermal Considerations.......................................................................................................................... 22 SHORT CIRCUIT PROTECTION RESPONSE ....................................................................................................... 23 SCHEMATIC DIAGRAMS .................................................................................................................................. 25 IRAUDAMP9 FABRICATION BILL OF MATERIALS (BOM)....................................................................... 30 IRAUDAMP9 PCB SPECIFICATIONS........................................................................................................... 34 REVISION CHANGES DESCRIPTIONS........................................................................................................ 39 www.irf.com IRAUDAMP9 REV 2.0 Page 2 of 39