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TL4242: QUESTION OF PWM DIMMING

WU YISYUAN
Expert 2165 points
Part Number: TL4242

HI,

     I am testing TL4242, find the PWM dimming not work.

    12V power supply
It was found that PWM PIN > 1.3V, LED was fully bright.
PWM < 1.3V, LED is completely extinguished and has no dimming function.
Where is the problem?

    my schematic diagram as below:

thanks,

  • 0
    TI__Genius 11836 points

    Hi, YISYUAN,

          Please note that high level of PWM enables the device and low level disables the device.You can regulate the LED brightness through the duty cycle of PWM rather than the amplitude of PWM. I suggest that you should first read the datasheet carefully.