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TPS53603A deadtime control

user4005424
Prodigy 150 points

This is about the adaptive deadtime control of TPS53603A.

1）In the function diagram， SW and HDR are the input signal of the comparator，VTH and HDR are the signal of the comparator. Could you tell me about the purpose of the both comparators? It seems about the deadtime?

2) In the paragraph about adaptive deadtime control, it just explain how to control the tr-DT. How about the tf-DT? Could you explain it?

3) In the paragraph about adaptivd deadtime control, a proper threshold is ?

Thanks a lot.

  • 0
    TI__Mastermind 24075 points

    Hello, 

    1. Yes. it is for dead time. 

    2. The mechanism of tf-DT is similar as tr-DT. When PWM is low, the high-side gate voltage (voltage between HDRV and SW) begins to fall. The high-side gate voltage is sensed. After high-side gate voltage is lower than a threshold, the low_side gate voltage (LDRV) begins to rise up after a delay time. 

    3. According to figure 14 and 15, the proper threshod is around 1V. 

    Thanks

    Qian