International Rectifier IRAUDAMP17, Справочный проект

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IRAUDAMP17 REV
1.1
Introduction
The IRAUDAMP17 reference design is a two-channel, 100W/ch (4 Ω /52V Bus voltage) half-bridge
Class D audio power amplifier with single power supply. This reference design demonstrates how to
use the IR4302 IC with single power supply, implement protection circuits, and design an optimum
PCB layout using PowIRaudio integrated Class D IC. This reference design does not require
additional heatsink or fan cooling for normal operation (one-eighth of continuous rated power).The
reference design provides 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

Powered speakers

Sub-woofers

Musical Instrument amplifiers

Car audio amplifiers
Features
Output Power: 100W x 2 channels (10%THD+N 4 Ω load; with heatsink),
60W x 2 channels (10%THD+N 4 Ω load; no heatsink),
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
Specifications
General Test Conditions (unless otherwise noted) Notes / Conditions
40V~52V With heatsink
Supply Voltages
30V~42V * Without heatsink
Load Impedance 2-4 Ω Resistive load
Self-Oscillating Frequency 400kHz No input signal, Adjustable
Gain Setting 24.8dB 1Vrms input yields rated power
Electrical Data Typical Notes / Conditions
IR Devices Used IR4302 PowIRaudio integrated Class D IC
Modulator Self-oscillating, second order sigma-delta modulation, analog input
40V~52V Single power supply;
Power Supply Range
30V~42V * Without heatsink
75W 1kHz, 4 Ω load, with heatsink
Output Power CH1-2: (1% THD+N)
50W 1kHz, 4 Ω load, without heatsink
100W 1kHz, 4 Ω load, with heatsink
Output Power CH1-2: (10% THD+N)
60W 1kHz, 4 Ω load, without heatsink
Rated Load Impedance 2-4 Ω Resistive load
Idling Supply Current 65mA No input signal
Total Idle Power Consumption 3.4W No input signal
Distortion 0.008% THD+N @ 30W, 4 Ω