Datasheet

BCR402W

LED Driver

Datasheet 7 Revision 2.0, 2012-04-12

1 LED Driver

1.1 Features

1.2 Applications

• Channel letters for advertising, LED strips for decorative lighting

• Aircraft, train, ship illumination

• Retrofits for general lighting, white goods like refrigerator lighting

• Medical lighting

• Automotive applications like CHMSL and rear combination lights

1.3 General Description

The BCR402W is a cost efficient LED driver to drive low power LEDs. The advantages towards resistor biasing

are:

• homogenous light output despite of varying forward voltages in different LED strings

• homogenous light output of LEDs despite of voltage drop across long supply lines

• homogenous light output independent from supply voltage variations

• longer lifetime of the LEDs due to reduced output current at higher temperatures (negative thermal coefficient)

The advantages towards discrete solutions are:

• lower assembly cost

• smaller form factor

• higher reliability due to less soldering joints

• higher output current accuracy due to pretested LED drivers

Dimming is possible by using an external digital transistor at the ground pin.

The BCR402W can be operated at higher supply voltages adding LEDs between the supply voltage V

and the

power supply pin of the LED driver. You can find further details in our application notes.

• LED drive current preset to 20 mA

• Output current adjustable up to 60 mA with an external resistor

• Easy paralleling of drivers to increase current

• Supply voltage up to 18 V

• High current accuracy at supply voltage variation

• Low voltage overhead of 1.2 V

• Up to 500 mW power dissipation in a small SOT343 package

• Negative thermal coefficient of -0.3 %/K reduces output current at higher temperatures

• RoHS compliant (Pb-free) package

• Automotive qualified according AEC Q101

SOT343-3D