I would like to use ADuCM410 to drive an H-bridge with n-FETs at the high side as well as the low side.
Specifically, the H-bridge we would like to drive is composed of two LMG5200 GaN half-bridges, each of which has integrated driver circuitry. So, I only need to provide the PWM signals for switching.
My problem is that the H-bridge mode of the ADuCM410's PWM unit seems to be designed to drive H-bridges with p-FETs at the high side and n-FETs at the low side. Specifically, in H-bridge mode, the ADuCM410's PWM unit outputs 0 to enable the high-side of the H-bridge, while the bridge that we are trying to drive requires logic 1 to enable the high-side. (The low side enable signal of logic 1 is fine.) The PWM unit of the ADuCM410 seems to allow me to invert the low-side of the PWM output (by setting PWM0INV, bit 11 of PWMCON0); however, I could not figure out how I can invert the high-side output while keeping the low-side output as is. Unfortunately, as far as I can see, setting POINV (bit 5 of PWMCON0) does not seem to do the trick, either.
Any advice would be sincerely appreciated. Please let me know if I can provide any additional details to clarify.
