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Ti f28335 help in controlling

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Benn Ng

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hi guys,

i would require to control a 3 phase PWM signal using dsp from ti, f28335.

i would like to bulid a circuit that could control the duty cycle. meaning to put a potentiometer in its analog control a0 to vary the reference voltage to output the frequency. by controlling the reference voltage. the output duty cycle will change hence the 3 phase pwm will change it duty cycle with respect to the input of the dsp.

but i could not bulid a potentiometer as i have no knowledge of DSP. please advise.

attached is the 3 phase pwm circuit that is able to produce 3 phase 120deg apart signal. dsp.PNG
 

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