0.00

10.00

20.00

30.00

40.00

50.00

60.00

0.00

2.00

4.00

6.00

8.00

10.00

Total Pow er (W)

Ta=25 degC

Adjustments of DC offset and Switching Frequency

Component Number

Adjustment

R10

DC offset for CH-1

R26

Switching Frequency for CH-1

R22

DC offset for CH-2

R27

Switching Frequency for CH-2

Adjustments have to be done at an idling condition with no signal input.

Note: The PWM switching frequency in this type of self oscillating scheme greatly impacts the audio

performances, especially in the case where two or more channels are in close proximity.

Thermal Considerations

The IRAUDAMP1 unitlizes a relatively thick aluminum block heatsink for peak power output handling

capabilities. It can handle continuous 1/8 of the rated power, which is generally considered to be a

normal operating condition in safety standards, for a considerable length of time such as one hour. The

size of the heatsink, however, is not sufficient to handle continuous rated power.

Fig.2 shows the relationship between total power dissipation and temperature rise at equilibrium. If

testing requires running conditions with continuous power a higher than 1/8 of the rated power, then,

attach extensions to the top of the heatsink using three M4 screw taps prepared for this purpose. Please

note that the heatsink is electrically connected to the GND pin.

www.irf.com

5

Fig.2 Heatsink Thermal Characteristic at Equilibrium