BCR450E6327 Datasheet, PDF (15/16 Pages) Infineon Technologies AG – LED Driver IC

BCR450
LED Driver IC
Evaluation Board
5
Evaluation Board
The evaluation board is designed to test the BCR450 as a stand alone device for lower LED current applications
and also with additional external “booster“ transistors for high current, high brightness LEDs. Up to three external
transistors BCX68 or BC817SU each could be used on the PCB to minimize thermal problems.
3 LEDs in series for high current mode or 3 LEDs for low current applications can be chosen by setting resistors
(for further application hints see AN105). The particular sense voltage can be derived by jumpers which are
provided in the layout for each test case. Additional test circuit is included to measure AC characteristics, and the
ENABLE input is designed to connect a PWM signal. The PCB is manufactured in double sided FR4 with substrate
thickness of 1.0 mm.
Vbat
AC- Measure
P1
BCR450 LED Controller
Vs, Pin 6
Vsense, Pin 4
-
+
= _Vref
Iout, Pin 1
P2
LEDs
PWM
EN, Pin 3
GND, Pin 2 & 5
LEDs
Jumper-L
Jumper-H
Rsenselow
BCX68-25
or
BC817SU
NPN
Power
Transistors
Rsensehigh
Figure 3 Evaluation board schematic
BCR450_Application circuit.vsd
Datasheet
15
Rev. 3.1, 2013-02-21