Hi team,
Issue: the VM pins are burned out at use.
On the script, VREF is 5V, current limiting resistor is 0.2ohm, VM voltage is 24V. The output PWM signal is transmitted as a signal and is not used as a drive motor with a load current of less than 50 mA. Why is it easy to burn the VM pins in this situation?
The customer suspects that the voltage is reversed due to VM and ground. How much lower is the voltage of VM than the voltage of ground when power is first applied or powered off will cause the VM pin to burn out?
Add a diode IN4007 between VM and ground to clamp the voltage of ground so that ground is not allowed to be much higher than VM. Is it possible?
The customer also tried to limit the PWM output current below 0.25 a by setting the VREF voltage to 4.6 V and changing the current limiting resistor to 2 ohms. But don't know if it's related to the burning of the VM pins?
Could you help check this case? Thanks.
Best Regards,
Cherry
