Part Number: DRV8432
Hi,
I am using a DRV8432DKD in 4 H-Bridge configuration to rectify 13 VAC to 35 VDC with a 100 ohm Load in a TI Dual motor control + PFC Board. I am only using the DSP and the motor driver (not the PFC part). However when I am connecting the external 12 VDC Power supply for the DSP and the driver, the reset pin automatically gets a bias of about 1.5 V. Also, when I am connecting the AC supply, instead of seeing a rectified DC voltage of about 17 V I am seeing very small voltage. When I remove the DSP card, the reset pin gets to low and the Voltage in the DC bus becomes as expected. I have tried to calculate the DSP current draw in the reset pin and also tried to change the pull down resister but it did not work. Any suggestion or information regarding this would be very helpful.
Thanks,