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NCP5010
TYPICAL APPLICATION CIRCUITS
Basic Feedback
Figure 29 is a basic application where a regulated courant
is drive in a string of LEDs. A 20.8 mA current is fixed by
R1 and LEDs are dim with PWM apply on CTRL pin.
V Bat
2.7 to 5.5 V
C in
4.7 m F 0603
L1
22 m H
LED
C2
1 m F 0805
X5R 25 V
X5R 6.3 V
PWM
A2
CTRL
V OUT
C1
LED
NCP5010
R1
24
L1:
C1:
C2:
TDK VLF4012AT?220MR51
TDK C1608X5R0J475MT
TDK C2012X5R1E105MT
Figure 29. Typical Semi?Pulsed Mode of Operation
Different Supply
The NCP5010 can operate from two different supply:
One end of the inductor (V BAT ) can be directly connected
to a battery like 4 cell alkaline or 2 cell Li?Ion. And V IN pin
V Bat
need a power delivered for example from an LDO. Care
must be observed to have always V BAT above V IN and
minimum output voltage range will be V BAT voltage.
V in
2.7 to 5.5 V
L1
22 m H
LED
C2
1 m F 0805
X5R 25 V
C in
4.7 m F 0603
X5R 6.3 V
ENABLE
A2
CTRL
V OUT
C1
LED
NCP5010
R1
24
L1:
C1:
C2:
TDK VLF4012AT?220MR51
TDK C1608X5R0J475MT
TDK C2012X5R1E105MT
Figure 30. Operate from Different Supply
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