InternationalRectifier ClassD 2x120W free download

File name InternationalRectifer-ClassD2x120W.pdf

IRAUDAMP4 120 W x 2 Channel Class D Audio Power Amplifier Using IRS20955 and IRF6645 By Johan Strydom, Jun Honda, and Jorge Cerezo Table of Contents Page Introduction ... 1 Specifications ... 2 Functional Description... 4 Startup and Shutdown...12 Protection ...16 Typical Performance ...21 Design Documents ...27 www.irf.com RD-0617 Introduction The IRAUDAMP4 reference design is an example of a two-channel 120 W half-bridge Class D audio power amplifier. The reference design will demonstrate how to use the IRS20955, implement protection circuits, and design an optimum PCB layout using the IRF6645 DirectFET MOSFETs. The resulting design requires no heatsink for normal operation (one-eighth of continuous rated power). The reference design contains all the required housekeeping power supplies for ease of use. The two-channel design is scalable, for power and the number of channels. Applications AV receivers Home theater systems Mini component stereos Sub-woofers Features 120 W x two channels, Total Harmonic Distortion (THD) = 1%, 1 kHz Residual Noise: 52 µV, IHF-A weighted, AES-17 filter Distortion: 0.004% THD+N @ 60 W, 4 Efficiency: 96% @ 120 W, 4 , single-channel driven, Class D stage Multiple Protection Features: Over-current protection (OCP), Over-voltage protection (OVP), Under-voltage protection (UVP), DC-protection (DCP), Over-temperature protection (OTP) PWM Modulator: Self-oscillating half-bridge topology with optional clock synchronization Output Power: www.irf.com RD-0617 1 Specifications General Test Conditions (unless otherwise noted) Supply Voltage ±35 V Load Impedance 4 Self-Oscillating Frequency 400 kHz Gain Setting 26.8 dB Electrical Data IR Devices Used Notes / Conditions No input signal 1 Vrms input yields rated power Typical Notes / Conditions IRS20955 gate driver, IRF6645 DirectFET MOSFET Modulator Self-oscillating, second order sigma-delta modulation, analog input Power Supply Range ± 25 - 35 V Output Power CH1-2: (1% THD+N) 120 W 1 kHz Output Power CH1-2: (10% THD+N) 170 W 1 kHz Rated Load Impedance 4 Supply Current 100 mA No input signal Total Idle Power Consumption 7W No input signal Single-channel driven, Channel Efficiency 96% 120 W, Class D stage Audio Performance THD+N, 1 W THD+N, 10 W THD+N, 60 W Dynamic Range Residual Noise, 20Hz - 20 kHz BW, A-Weighted Damping Factor Channel Separation Frequency Response : 20Hz-20 kHz : 20Hz-40 kHz Thermal Performance Idling 2ch x 1