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TPS543A22: SYNC frequency

Hailey Chen
Expert 3190 points
Part Number: TPS543A22


Hi,team：

    Could TPS543A22 set any frequency with external sycn clock？or only map to 5 fixed frequencies？

   

  • +1
    TI__Mastermind 24745 points

    There are 5 internal switching frequency settings.    The SYNC frequency ranges is from 400kHz to 2640kHz as shown in the 7-2 table. 

    If sync'ing to an external clock of 800kHz, use the Rfsel that yields 750kHz.   

    If the device starts up before an external clock signal is applied, then the internal PWM oscillator frequency is set by the RFSEL resistor.

    If the external clock is applied before the device starts up, then the RFSEL resistor is not needed.

    Any time the external clock is not present, the device defaults to the internal PWM oscillator frequency