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DRV10970: Can I use external FET's with this device

Manusha Wijekoon
Prodigy 80 points
Part Number: DRV10970

Hi

I have used this device to power a 24V BLDC motor. I have set output current limits appropriately so the chip will not be overloaded.

This works ok with 10-12V, but at low speeds torque of the motor is very low. Increasing the voltage to 18 V burnt two of my chips and I have no idea why this happened as max VIN is indicated as 20V.

My questions:

1. What could be the reason for chip damage when  source voltage is increased to 18V?

2. Is it possible/recommended to use DRV10970 to drive external FET's rather than the motor directly? 

Thanks

A

  • +1
    TI__Mastermind 26046 points

    Hello Manusha,

    1) When operating at higher recommended voltages, ensure your VM bypass capacitors and charge pump caps are rated for 1.5x to 2x their DC operating voltages. VM is recommend to be at least 1.5x to 2x the VM voltage, lower voltage ratings can cause less effective bypass capacitance and can cause the device to damage if transients occur at VM.

    2) This device is designed to drive with a 3-phase BLDC motor, not external FETs. 

    Thanks,
    Aaron