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TPS92520-Q1: Pwm duty cycle will control the Iout or Vout ?

Shashikumar B
Prodigy 40 points
Part Number: TPS92520-Q1

I am beginner for the Topic.

As per datasheet it is the Buck IC.   How we can calculate the output voltage? 

example: My Led Vf is (8 - 10)V, (0.5 - 1.2)A. Input voltage (Vin) for Ic from battery is 13-14V, i am expecting a Buck output of 9.5V and 1.2A.

By using the above ic, How i have to set Vout for 9.5V and  Output Current 1.2A?

Pwm duty cycle will control the Iout or Vout ?

Thankyou,

  • 0
    TI__Mastermind 23176 points

    Hello Shashikumar,

    This is a buck constant current source/regulator.  It regulates the output current into the LEDs.  If the Vf of an LED is 3V at 1A then if you set the registers based on components selection such that it outputs 1A then the output voltage will be 3V.  You don't set the output voltage, you set the output current. 

    PWM duty cycle controls the average output current by changing the duty cycle of the output current.  For example, if you output 1A current to the LEDs in steady state.  The average is 1A.  If you apply a PWM signal to control the output current such that you are operating at 50% duty cycle then the average output current to the LED will be 0.5A.  The PWM frequency is selected such that the human eye can't see the change change in output current, which is usually at least 200 Hz.  

    I am putting a link below to TI training videos for driving LEDs. 

    https://www.ti.com/video/series/led-driver-basics.html 

    -Francis Houde