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TPS65094: TPS650942 frequency tolerance

Wang Kris
Intellectual 270 points
Part Number: TPS65094


Dear Sir:

According to the TPS650942 datasheet, the switching frequency of buck 3 is 1.7MhZ at vout 1.05V.

may i know 1.7Mhz have any tolerance,

I use short pin for probe to measure, The current amount of switching frequency of about 1.3Mhz.

  • 0
    TI__Genius 17380 points

    Hi Wang,

    BUCK3, BUCK4, and BUCK5 are all DCS-control converters with a heavy emphasis on transient response and optimal PFM-to-PWM transition. More detail on DCS-control is available here: 

    This control scheme does not have a fixed frequency. It can vary based on VIN, VOUT, IOUT, inductance, capacitance, and even parasitic impedances. As a result, we generally test the frequency on our EVM and list that as the "typical" but there can be variation board to board. Seeing a switching frequency of 1.3 MHz does not indicate that there is a problem with the circuit.