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NCP5010
Multiple LEDs String
Since the output voltage in limited at 22 V (nom.), one
can arrange the LEDs in 2 or more string. Figure 31 shows
two LEDs branches where the constant current is regulated
in primary branch and the secondary branch is selected by
Q1. The number of LED in each string have to be the same.
V Bat
2.7 to 5.5 V
C2
X5R 6.3 V
L1
22 m H
LED
LED
1 m F 0805
X5R 25 V
C1
4.7 m F 0603
X5R 6.3 V
ENABLE
A2
CTRL
V OUT
C1
LED
LED
NCP5010
PRIMARY BRANCH
R1
24
R2
24
L1:
C1:
C2:
TDK VLF4012AT?220MR51
TDK C1608X5R0J475MT
TDK C2012X5R1E105MT
Q1
ENABLE SECONDARY BRANCH
N
Figure 31. Multiple LED String Application
Matched LEDs Branches
Should one need to control precisely the current in two
LEDs branches the schematic Figure 32 can be used. An
dual NPN BC847BD is used to form a current mirror Q1
like this the current in the secondary branch I2 equal the
current in primary branch I1. Thank to this current mirror
the number of LEDs in secondary branch could be lower or
equal than primary one.
V Bat
2.7 to 5.5 V
C2
X5R 6.3 V
L1
22 m H
LED
LED
1 m F 0805
X5R 25 V
C1
4.7 m F 0603
X5R 6.3 V
ENABLE
A2
CTRL
V OUT
C1
LED
LED
I1
I2
NPN Duals
NCP5010
Q1
Q1:
ON SEMICONDUCTOR BC847BDW1T1
R1
24
R2
24
L1:
C1:
C2:
TDK VLF4012AT?220MR51
TDK C1608X5R0J475MT
TDK C2012X5R1E105MT
Figure 32. Matched 2 Branches of LEDs
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