DC/DC Converter Application Note

The LED High-speed Dimming Control

LED High-speed Dimming Control

The LED brightness is set by the current through the LEDs, it can be controlled by the Duty of a PWM signal applied to the CE pin. The current through the LEDs can be calculated by the following formula.

ILED=Hduty x VFB / R1

Following product with high-speed dimming control can be used in the PWM signal range between 200Hz to 300kHz.
When controlling the LED brightness with a PWM signal of 20kHz or less; The variation of the inductor current might cause audible sounds, please use a PWM signal in the high frequency area to avoid this.

Products containing LED High-speed Dimming Control

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