Part Number:DRV8332
I am using the DRV8332 with a ATMEL SAMC21.
I have already blown up 3 DRV8332 chips despite having the OC resistor set for 4A protection (which our load should never reach) and CBC set and the chip does not get warm it just blows... so no over loading to my observation.
So I am guessing we are using the chip wrongly.
As I am moving from discrete transistors to this chip I did not fully recognise the difference in PWM scheme for complimentary mode.
Also getting the SAM C21 to flip the PWM for the compliment does not seem a built in funciton. So we always were using a simpler mode, where the PWM was driving the high side and logic driving the lowside with dead time imposed by design.
However since the DRV8332 is designed for complimentray use and the high low side switching occurs automatically, with the RST purely for Hi Z mode, my question is :-
Is it dangerous to run this chip assuming non complimentary mode.
Thus when driving phase AB with A high and B low and C RST false so Hi Z, then when the PWM signal is high on A and low on B(current flows through A and B to ground.
When the PWM reaches threshold and output drops so A goes low and B is still low, then it is as if you have pulled to ground both A and B and no current flows.
This non complimentary mode seems to work and we can drive the motor. But randomly the chip blows up.
So I am thinking we MUST implement complimentary, perhaps due to flyback protection being insufficient or some other problem.
In the end the question is: Can you use the DRV8332 in a non coimplimentary way that is safe?