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4

BL8040

PWM BRIGHTNESS DIMMING CONTROL at EN PIN

When EN pin is forced a PWM signal with frequency higher than 20KHz, the chip is in dimming mode. The internal

circuit changes the feedback voltage according to the duty cycle of the PWM signal. The feedback voltage (Vfb) is

simply defined as below:

Vfb=250mV x Duty Cycle (%)

To shut down the chip, one has to make the EN signal low, and keep its low state for more than 2.5ms.

PACKAGE INFORMATION

Package

SOT-23-6

Devices per reel

3000Pcs

Unit

mm

Package dimension：