Manual Adjustable LED Driver

Posted on April 25, 2010 by Rust

In many electronics-level adjustments such as LED drivers for LCD panel backlight controls, we can use AD5228. A manually adjustable LED driver is shown on figure below.

MANUAL ADJUSTABLE LED DRIVER circuit schematic diagram

The voltage across the white LED D1 is set by the AD5228 for the brightness control. A typical white LED with Vf of 3.5 V requires a resistor, R1, to limit U2 current since U2 handles up to 250 mA. This circuit is simple, but the power is not efficient. To conserve power, U2 shutdown pin can be toggled with a PWM signal. [Source: Analog Devices Application Note]

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