3 ms·
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 kee
by laydn 7y ago
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.
- rzzzt 7y agoThis 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_power_saving http://www.thinkwiki.org/wiki/How_to_enable_audio_codec_powe...
- segfaultbuserr 7y agoNow 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.