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NCP5006
Output Current Range Set?Up
The current regulation is achieved by means of an external sense resistor connected in series with the LED string.
V bat
L1
22 m H
V out
1
D1
FB
3
Q1
CONTROLLER
GND
Figure 8. Output Current Feedback
R1
x W
GND
The current flowing through the LED creates a voltage
drop across the sense resistor R1. The voltage drop is
constantly monitored internally, and maximum peak
current allowed in the inductor is set accordingly in order
to keep constant this voltage drop (and thus the current
flowing through the LED). For example, should one need
a 10 mA output current, the sense resistor should be sized
according to the following equation:
A standard 5% tolerance resistor, 22 W SMD device,
yields 9.09 mA, good enough to fulfill the back light
demand. The typical application schematic diagram is
provided in Figure 9.
R1 + Feedback Threshold + 200 mV + 20 W
Iout 10 mA
(eq. 9)
U1
V bat
Pulse
4
EN
V bat
5
C1
4.7 m F
L1
22 m H
GND
GND
2
3
GND
FB
V out
1
D1
MBR0530
C2
NCP5006
1.0 m F
GND
R1
D6
D5
D4
D3
D2
GND
22 W
LWT67C LWT67C LWT67C LWT67C LWT67C
Figure 9. Basic Schematic Diagram
http://onsemi.com
8
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