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PA4402

Click-Pop Suppression Device

ANALOG PRODUCTS DIVISION

2929 S Fair Lane, Tempe, AZ, 85282 Tel: (602) 431-8101. Fax: (602) 431-2288

www.protekdevices.com

95026. Rev.2. 02/2012

NOT FOR USE IN LIFE SUPPORT SYSTEMS

Figure 5: Power Down sequence waveforms

Channel 1 (yellow waveform) is the fall of the 12V power supply.

Channel 2 (blue waveform) is the waveform at the bypass capacitor input plate.

Channel 4 (green waveform) is the waveform at the bypass capacitor output plate without the PA4402.

Channel 3 (magenta waveform) is the waveform at the bypass capacitor output plate with the PA4402.

In Figure 4, the audible POP noise can be as high as 4.8V (Channel 4) with a negative swing without using the PA4402. When

the PA4402 is active this negative swing is suppressed to less than 200mV (Channel 3) in this case.