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TIDM-1007: Start up code for bootstrap powered GaN daughter card
Part Number: TIDM-02008
I see there is enable swap of high frequency PWM at negativeZeroCrossing3, which let PWMxA= PWMxB, PWMxB= PWMxA.
if(acSine < threshold_NZC2)
// Enable xA xB Swap
And remain the setting, after that, disable the swap of high frequency PWM at positiveZeroCrossing3
if(acSine > threshold_PZC2 )
// Dead band output swap disabled
I really don't understand, why you want to let PWMxA= PWMxB, PWMxB= PWMxA during the whole negativeHalf stage?
zerocrossing1 means shut down all the PWM channels
zerocrossing2 means giving the high frequency channels a fixed duty 0.004
zerocrossing3 means soft start of the high frequency channels, using state_slew_max to control the end of this stage.
look forward to your answers.
The active FETs swap between positive half and negative half, thats why we use the swap feature on the PWM module, this avoids re-calculating the duty for each half differently.
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In reply to Manish Bhardwaj:
thanks, i think this diagram give me a clear understand.
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