BCR320UE6327_15 Datasheet, PDF (23/26 Pages) Infineon Technologies AG – LED Driver

4
Application hints
BCR 320U E6327 / BCR 321U E6327
Application hints
+V _S
µC
I_EN
I_out
EN 1 OUT 2,3,5
R_ext
6
R_ext
(optional )
GND
4
BCR 321U E6327
Vdrop
Figure 4-1 Application Circuit: Enabling / PWM by Micro Controller
+V _S
IEN
Iout
EN 1 OUT 2,3,5
Rext
6
Rext
(optional )
GND
4
BCR 320U E6327
V _drop
Figure 4-2 Application Circuit: Enabling by Connecting to V_S
Application hints
BCR 320U E6327 / BCR 321U E6327 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 250 mA. R_ext can be
determined by using Figure 3-5 or Figure 3-15. Connecting a low tolerance resistor R_ext will improve the overall
accuracy of the current sense resistance formed by the parallel connection of R_int and R_ext leading to an improved
current accuracy. 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 www.infineon.com/lowcostleddriver for application notes and for up-to-date
application information.
Datasheet
23
Revision 2.1, 2015-01-28