We a trying to drive a stepper motor using DRV8303. We are interfacing and configuring the DRV IC using micro controller. We have configured DRV8303 in 3 PWM mode. We checked the MCU output for PWM and it shows correct values. We also checked the DRV output for PWM which was correct and it was generating complementary output which was required as per the configuration. But this condition was satisfied till we have not mounted any MOSFETs on our board. As soon as we mounted the MOSFETs on our board we saw that the DRV's PWM output disappeared from the lower MOSFET and the high MOSFET was showing a very low voltage square pulses which was not matching with our PWM input to the DRV.
↧