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TPS54810 - Switching frequency

siva Kumar
Prodigy 10 points

We are designing the system with TPS54810PWP switching regulator, Its working fine but we are observing the switching frequency in power and ground. Actually we configured for 700KHz frequency but we are observing at 695KHz in power section.

We are working in Base-band processing, these (switching power ) frequencies are coming into our required band.

lease let me know your feedback and suggestions (this power section circuit design as EVM-schematics).

 

Best Regards,

Siva Kumar.

 

  • 0
    TI__Genius 16280 points

    The resistor across RT to GND configures  the operating frequency. The frequency will not be very accurate (Refer to OSCILLATOR segment on Pg. 3 in datasheet) and +/-10% tolerance might be achieved. You can change resistor value to make frequency away from the required band.

    Also, SYNC pin can be used to configure accurate operating frequency by driving a synchronization signal into it. In this way, a frequency within 330 kHz to 700 kHz can be achieved by purpose. RT resistor should set the free running frequency to 80% of the synchronization signal. 

     

    Regards, 

    Xiaoguang Yu