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TPS92611-Q1: please kindly help review schematic

Part Number: TPS92611-Q1

Hi Expert,

Could you please kindly help review schematic as below? Thanks a lot for help!

BR,

Elec Cheng

  • Hi Elec,

    1. This schematic lacks capacitors: TI recommends to add capacitors C1 and C2 at SUPPLY and OUT. TI recommends C1 of 1 µF and 100 nF close to the SUPPLY pin, and C2 of 10 nF close to the OUT pin. A larger capacitor for C1 or C2 is helpful for EMC and ESD; however, it takes a longer time to charge up the capacitor and could affect PWM dimming performance.

    2. Is the signal to EN and PWM separate? What's the PWM frequency and duty cycle here?

    3. The internal Pull-down current of Fault is 750uA(typ), while the external pull-up is 3.3mA.

    There is no need to pull-up here.

    BR, Gracie

  • Hi Gracie,

    Is the signal to EN and PWM separate? What's the PWM frequency and duty cycle here?

    Yes,. PWM is about 200Hz and it's has 100% duty condition.

    BR,

    Elec Cheng

  • Hi Elec, 

    This on-time should be OK.

    BR, Gracie