3.2.2 High-Resolution PWM with Fine Edge Placement
The trigger mechanisms are summarized in Table 3-3. PWM generators are set up to run at 100 kHz with defined dead times. The PWM generators’ setup is optimized to run purely in core independent peripherals for PSFB-CDR.
More details are available in the MCC and MPLAB projects.
| PWM Generator Number | Details | Function | Start of Cycle Trigger | Peripheral Setting |
|---|---|---|---|---|
| PWM Generator 1 (PG1) | Complimentary PWM at 100 kHz at 50% duty cycle | Generating signals for the fixed leg of PSFB | Self-Triggered | PG1 end of cycle |
| PWM Generator 3 (PG3) | Complimentary PWM at 100 kHz at 50% duty cycle | Generating signals for the phase-shifted leg of PSFB | Phase delayed and synchronized to PG1 | Trigger value from PG1 |
| PWM Generator 2 (PG2) | Complimentary PWM at 100 kHz, swapped. Only high-side signal used | Generating the synchronous rectifier signal for SR2 | Synchronized to PG3. Duty Cycle = Period – Phase Delay | Trigger value from PG3 and swapping the high and low-side signal |
| PWM Generator 4 (PG4) | Complimentary PWM at 100 kHz, swapped. Only high-side signal used | Generating the synchronous rectifier signal for SR1 | Synchronized to PG1. Duty Cycle = Period – Phase Delay | Trigger value from PG1 and swapping the high and low-side signal |