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TPS61165: TPS61165 Consulting

Fandy
Expert 2285 points
Part Number: TPS61165

Hello

Application: Vin=5V ,Vout=20V,Iled(max)=150mA, need Enable and PWM dimming function

I want to check if it could be implememted by Figure 16 SCH ? using CTRL as Enable/Disable PIN, PWM dimming through inject to FB pin like Fighure16

and how to calculate Iled ? equation is LED Current =1.8V*(1-d)/8*Rset ? what's the meaning of d ?

while I want to check the recommended range of  PWM frequency and voltage ?

Thanks

  • 0
    TI__Mastermind 22745 points
    Hi Fandy,
    Yes, you can configure as this way, for 150mA, you need to change the Rset=200mV/150mA=1.34ohm, d is the duty cyle of your pwm signal. 1.8 is the ampitude of your pwm signal. You need to make sure your PWM voltage on FB will not exceed 200mV. And the frequency should be less than 1kHz. You'd better verify again with certain frequency.
    Regards
    Sean