Hi expert,
From datasheet, the UCC27282 is quite fit for BLDC/PMSM motor gate driver, such as interlock protection, negtive voltage protection, integrated bootstrap diode, small package, etc. But in datasheet, I didn't see motor driver application. For many other gate drivers, motor driver application will be noted in application area. Is UCC27282 not fit for motor driver?
Thanks
Peter
Hi Peter,
The bootstrap capacitor depends on the total gate charge (or total load charge on the gate driver output) and the bias voltage ripple. Yes, the duty cycle and the frequency will also play the role in deciding the bootstrap capacitor. This procedure is explained in the section 8.2.2.1 (Select Bootstrap and VDD Capacitor) of the datasheet (partly shown below). 10s of kHZ of switching frequency is no concern for UCC27282.
We recommend that customer follow this procedure. Oversizing or under-sizing of this capacitor has other design impacts and thus it is better if these values are optimized.
Please let us know if you have any question.
