BCR420U Datasheet, PDF (10/12 Pages) Infineon Technologies AG – LED Driver

Application circuit:
Enabling / PWM by micro controller
+Vs
µC
IEN
IOUT
EN 1 OUT 2,3,5
BCR420U / BCR421U
Application circuit:
Enabling by connecting to Vs
+Vs
IEN
IOUT
EN OUT 2,3,5
Rext
6
GND
4
BCR421U
Vdrop
Rext
6
GND
4
BCR420U
Vdrop
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. R_ext can be determined by using the diagram 'Output current versus
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.
Please visit our web site for application notes: www.infineon.com/lowcostleddriver
for up-to-date application information
10
2010-01-15