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STM32F4: Can DAC_OUT w/o Buffer direct drive a Speaker without getting damaged?

Question asked by Miro Mico on Jun 29, 2017
Latest reply on Jun 29, 2017 by AvaTar

I try to make some noise using a small 8 OHm @ 1 kHz Buzzer connected to the STM32F446 DAC_OUT1. Seams the PA4 pin got damaged due to high or reverse voltage induced by the buzzer. I used th push/pull GPIO config. Is it possible to directly drive this buzzer without an external PA IC maybe by enabling the internal DAC-Buffer? Or is it required to drive the buzzer via an PA? Or would the IO cell get damaged due to high or reverse voltage induced by the speakers large inductance?

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