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TPS61197: Leds blinks using PWM control

Part Number: TPS61197

Dear TI support team,

I am testing the TPS61197, here is my schematic:

When i put 5vdc on the PWM pin everything is fine. The led light up.

But when i put a pwm signal (f=200Hz/dcy=50%) in order to do some dimming, the leds blinks. It is like the converter loop between on and off state.

If i change the pwm frequency up to 10Khz and more, the leds lights only one time (something like 100ms ON) and then stay off.

Have you any ideas of what's happening ?

Regards,

Nicolas.