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LP-AM243: EPWM

Part Number: LP-AM243

Tool/software:

What is the minimum frequency that EPWM ports on the LP-AM243 can achieve. I am not able to get anything less than 620 Hz. Even if I set the frequency to be 50 Hz in the example given, it produces a PEM wave with the correct duty ratio but the wrong frequency. How can I achieve 50 Hz on the EPWM port?