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DRV8323: Different voltage sources for VM and VDRAIN pins for variable voltage control

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Part Number:DRV8323

I am designing a BLDC motor controller using DRV8323RS. I want to drive the motors always with 100% PWM to minimize switching noise and EMI, therefore, I want to regulate the speed of motors by having a variable voltage source at drains of my mosfets.

The question is since the DRV8323 has VM, VIN and VDRAIN pins and there are UVLO and other safety features...how fat these values can be from each other? I would like to go as low as 2 volts for the drain voltages while maintaining 15V for VM/VIN pins.

Basically, I have a 15-volt main power supply and I want to use a switching power supply to control the voltage at VDRAIN separately.


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