Hi all!
I am using the IHM08M1 power board for a BLDC/PMSM motor application, and I have a doubt regarding the L6398 gate driver input logic.
My question is:
If I use PWM to control the high-side MOSFET and a GPIO to control the low-side MOSFET, is this approach correct when working with the L6398 gate driver?
I am asking because I am currently using complementary PWM mode on my microcontroller. In complementary mode, the signals are inverted (PWM and its opposite), so HIN and LIN cannot receive the same logic level. Because of this, the L6398 truth table does not match, since the driver expects:
HIN = HIGH, LIN = HIGH → High-side ON
HIN = LOW, LIN = LOW → Low-side ON
With complementary PWM, this is impossible because the two signals are always opposite.
So I am considering using:
PWM → HIN (high-side)
GPIO → LIN (low-side)
I would like to know whether this method is valid, or if there is a better recommended way to drive the L6398 when only complementary PWM outputs are available.
Please let me know if my understanding is correct or if I am missing anything.
Thanks!
