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Original question:

TPS54200: TPS54200 PWM Limitation

TPS54200: reference voltage when PWM is pulled high

Jerry Chen
Expert 5110 points
Part Number: TPS54200

Hi team,

In customer's design, PWM is pulled high by MCU GPIO default high status. In this status, is the reference voltage 100mV or 200mV?

Thanks.

  • +1
    TI__Genius 13001 points

    Hi Jerry,

    Once tps54200 is enabled, after 30us, the device will decide to choose analog dimming or PWM dimming. if the external is higher than 2.07V, analog dimming is chosen while PWM dimming is selected when external signal is between 1V and 2.07V.

    So come back to your question, if the GPIO's voltage is higher than 2.07V when tps54200 is enabled for the first time. then FB voltage is 200mV(analog dimming mode). Once the dimming mode is selected, it's locked and will not change whatever GPIO's voltage is unless tps54200 is enabled again.

    Robin