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TPSM53602: switching frequency in PFM mode ?

vinay kattela
Prodigy 70 points
Part Number: TPSM53602

While I referred datasheetTPSM53602RDAR, as the switching frequency is dependent on the input voltage, output voltage and the load current.

Most probably we might be at 1.4Mhz switching freq in PWM mode for the cases only if we hit the min load current per figure 7-14, 7-15.

TPSM53602, 3.8-V to 36-V Input, 1-V to 7-V Output, 2-A Power Module datasheet (Rev. B) (ti.com)

what might be the switching frequency, where the load currents are lower, which means the part would be in PFM mode

  • 0
    TI__Genius 15220 points

    Hi Vinay,

    We may be able to use Webench to simulate the switching frequency the device has at your customer's operating condition. Could you list your customer's operating conditions

    (VIN/VOUT/IOUT/TEMP/etc.)?

    Thanks,

    Andrew

  • 0
    Prodigy 70 points

    Hello Andrew,

    hope following table gives hint of required info.

    operating ambient temperature at the max 40 degree C

    Ref Des

    Supply

    Part Number

    Switching frequency

    Min load current to hit 1.4Mhz

    U42

    +12V to +5V

    TPSM53602RDAR

    Unknown; PFM mode

    >0.35A PWM mode, if <0.35A PFM mode

    U43

    +12V to +1V

    TPSM53602RDAR

    Unknown; PFM mode

    >1A PWM mode, if <1A PFM mode

    U44

    +12V to +3.3V

    TPSM53602RDAR

    1.4MHz (typ); PWM mode

    >0.65A PWM mode, if <0.65A PFM mode

    U45

    +12V to +1.8V

    TPSM53602RDAR

    1.4MHz (typ); PWM mode

    >0.7A PWM mode, if <0.7 PFM mode
  • 0 in reply to vinay kattela
    TI__Genius 15220 points

    Hi Vinay,

    You can check the switching frequency on Webench for any operating condition.

    Just enter the input operating conditions here:

    Adjust there current on the simulator here:

    And the switching frequency shows up here.

    You can't really control when the device goes into PFM mode as the device will automatically shift to it when there's a light load condition. 

    Thanks,

    Andrew

  • 0 in reply to Andrew Kutzler
    Prodigy 70 points

    Thanx Andrew, that resolves my query.

    Appreciate for quick response.