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DRV8432: Output voltage precision of driver chip

Part Number: DRV8432

Hi,

Is there a specification in the datasheet that describes the output voltage precision of the FETs while in parallel bridge mode? I'm looking for something that says "At 20V (or some other voltage) out the voltage can be +/-500mV" or something along those lines.

Thanks,

Ben

  • Ben,

    Not sure I completely understand what you are asking, but the key specification that would effect the output voltage as it is related to the voltage supplied to PVDD is the Rdson.

    Assuming a fixed PVDD, 20V for example, the output will drop by the current thru the FET multiplied by the Rdson of the internal FETs.  For PBTL, the Rdson is a typical of 55 mohms.  For a current of 10A, you will see a drop in the output voltage of I*Rdson, or 10A * 0.055 = 0.550V. 

    So, your output will be ~19.45V taking into account the voltage drop across the output FETs and assuming 10A.  With lower current, this drop would be less.  Higher current will result in more loss across the FETs.