IRAUDAMP9 Datasheet, PDF (3/39 Pages) International Rectifier – 1.7 kW / 2-Ω Single Channel Class D Audio Power Amplifier Using the IRS2092S and IRFB4227

Introduction
The IRAUDAMP9 reference design is a single-channel 1.7-kW ( @ 2Ω load) half-bridge Class D audio
power amplifier. This reference design demonstrates how to use the IRS2092S Class D audio controller and
external gate buffer, to implement protection circuits, and design an optimum PCB layout using the
IRFB4227 (x 2 Pairs) TO-220 MOSFETs. This reference design may require additional heatsink or fan for
normal operation (one-eighth of continuous rated power). The reference design provides all the required
housekeeping power supplies for ease of use. The 1-channel design is capable of delivering higher than its
rated power with provision of larger heat sink ( Rth <2° C / W).
Applications
• Pro-Audio amplifiers
• Powered speakers
• Active Sub-woofers
• P.A. Systems
• Car audio amplifiers
Musical Instrument amplifier
Features
Output Power:
1.7 kW Single channel (2 Ω load, 1kHz, THD+N=10%),
Residual Noise:
290μV, IHF-A weighted, AES-17 filter
Distortion:
0.07% THD+N @ 600W, 2Ω
Efficiency:
97% @ 1.7 kW, 2Ω
Multiple Protection Features: Output Over-current protection (OCP), high side and low side
Input Over-voltage protection (OVP),
Input Under-voltage protection (UVP),
Output DC-offset protection (DCP),
Over-temperature protection (OTP)
PWM Modulator:
Self-oscillating half-bridge topology with optional clock synchronization
Specifications
General Test Conditions (unless otherwise noted)
Supply Voltages
±75V
Load Impedance
2Ω
Self-Oscillating Frequency
300kHz
Gain Setting
33dB
Notes / Conditions
No input signal, Adjustable
1Vrms input yields 1-kW
sinusoidal output power
Electrical Data
Typical
Notes / Conditions
IR Devices Used
IRS2092S Audio Controller and Gate-Driver,
IRFB4227 (x 2 Pairs) TO-220 MOSFETs
Modulator
Self-oscillating, second order sigma-delta modulation, analog input
Power Supply Range
± 48V to ±80V Bipolar power supply
Output Power CH1: (1% THD+N)
1200W
1kHz Sinewave
Output Power CH1: (10% THD+N)
1700W
1kHz Sinewave
Rated Load Impedance
2Ω
Non-inductive Resistive load
Idling Supply Current
+67mA , -105mA No input signal
Total Idle Power Consumption
13.2 W
No input signal
System Efficiency
97%
@ +/- 75V 1.7 kW, 2Ω
94%
@ +/- 75V 1.2 kW, 2Ω
74 %
@ +/- 75V 125 W (1/8 Po-rated), 2Ω
www.irf.com
IRAUDAMP9 REV 1.0
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