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Joe User

How to make PWM frequency as low as 50Hz

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I figured it out myself.

 

1. Use the Rate Scaling dropdown to divide the system clock to a lower rate. I'm using the F28069; it starts at 90MHz.

2. Use Up/Down count mode to get an additional divide by 2.

3. Choose a Timer Period that gives 50Hz (14046 for F28069)

 

The final PWM rate == sys clock/ rate scaling / period

If Count Mode is Up/Down, there is an additional divide by 2

Note that the current frequency is displayed next ot the Timer Period entry

 

F28x Config - Make PWM frequency as low as 50Hz.png

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