2010-01-15

10

BCR420U / BCR421U

Application circuit:

Enabling by connecting to Vs

Application circuit:

Enabling / PWM by micro controller

BCR421U

Vdrop

Rext

4

6

2,3,5

1

+Vs

EN

GND

µC

OUT

BCR420U

Vdrop

Rext

4

6

+Vs

GND

2,3,5

EN

OUT

Application hints

BCR420U / BCR421U serve as an easy to use constant current sources for LEDs.

In stand alone application an external resistor can be connected to adjust the current from

10 mA to 150 mA.

external resistor'. Please take into account that the resulting output currents will be slightly

lower due to the self heating of the component and the negative thermal coefficient.

for up-to-date application information