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That circuit appears to assume that AUDIO_PWR_EN signal will switch very infrequently.

If AUDIO_PWR_EN is a pin that is controlled by software, and, if you keep switching that pin such that the MOSFET is kept in the linear region due to the RC on the gate, that MOSFET will be toast very quickly.




This is intended to be a power saving feature; if enabled, audio detection will be driving the enable pin with a few seconds of hysteresis: http://www.thinkwiki.org/wiki/How_to_enable_audio_codec_powe...


Now the problem is, why would a MOSFET be destroyed even if there is a few seconds of hysteresis?! Well, defective driver is a still possibility, but perhaps it's a hardware problem.




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