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Application Note : DCDC Converters (Switching Regulators)

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 × VFB / R1

Following product with high-speed dimming control can be used in the PWM signal range between 200 Hz to 300 kHz.
When controlling the LED brightness with a PWM signal of 20 kHz 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.

LED High-speed Dimming Control Available

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