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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 (4
Ω
, 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 (4
Ω
, THD+N=1%)
or 370W x 2 channels (4
Ω
, THD+N=10%)
Residual Noise:
220
V, IHF-A weighted, AES-17 filter
Distortion:
0.008% THD+N @ 100W, 4
Ω
Efficiency:
90% @ 300W, 4
Ω
, 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
4
Ω
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
