I am considering to change the PWM frequency of DRV591 by enabling the external clock operation (Pin 31 is set high).
However, the datasheet describes that it may be limited to apply arbitrary frequencies other than either 100kHz or 500kHz.
The datasheet confines to use the internal (or external) clock of 100 kHz or 500 kHz with an external resistor and a capacitor, as given values in the datasheet.
Since the registor and the capacitor should be chosen within the predetermined tolerance, I might guess that the actual PWM frequency could deviate from the nominal 100kHz or 500kHz value. It hints me that the DRV591 can tolerate a certain frequency error of PWM clock, but can not tolerate the large frequency error.
Is this the real case? I would like to choose, for say, 200 kHz PWM frequency. But am I not allowed to do this?
From a bench test with an evaluation module, I see it might be possible which differs from what said in the datasheet.
Can anybody help me to confirm the usage of arbitrary frequency other than 100kHz or 500kHz?
Thank you very much in advance.
We recommend use at 100 or 500 kHz only. We have not designed, characterized, or tested the device for operation at other frequencies.
Audio Applications Engineering Manager
Dallas, TX USA
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