IRAUDAMP4A_15 Datasheet, PDF (11/44 Pages) International Rectifier – 120 W x 2 Channel Class D Audio Power Amplifier

100
10
1
%
0.1 ^{Self Osc. (ACD)}
0.01
Int. Clock @ 450 kHz
Int. Clock @ 300 kHz
0.001
100m
200m
500m
1
Self Osc. (Single Channel Driven)
2
5
10
20
Power (W)
50
100
200
Figure 6. THD+N Ratio vs. Output Power for Different Switching Frequency Lock/Synchronization
Conditions
IRS20957 Gate Driver IC
The IRAUDAMP4A uses the IRS20957, which is a high-voltage (up to 200 V), high-
speed power MOSFET gate driver with internal deadtime and protection functions
specifically designed for Class D audio amplifier applications. These functions include
OCP and UVP. A bi-directional current protection feature that protects both the high-side
and low-side MOSFETs are internal to the IRS20957, and the trip levels for both
MOSFETs can be set independently. In this design, the deadtime can be selected for
optimized performance, by minimizing deadtime while limiting shoot-through. As a result,
there is no gate-timing adjustment on the board. Selectable deadtime through the DT pin
voltage is an easy and reliable function which requires only two external resistors, R11
and R9.
R11
R9
Figure 7. System-level View of Gate Driver IRS20957
www.irf.com
IRAUDAMP4A
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