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NCP5007
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
4
D1
FB
1
Q1
CONTROLLER
GND
Figure 8. Output Current Feedback
R1
x W
GND
R1 + Feedback Threshold + 200 mV + 20 W
The current flowing through the LED creates a voltage
drop across the sense resistor R1. The voltage drop is
Iout 10 mA
(eq. 9)
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
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.
output current, the sense resistor should be sized according
to the following equation:
V bat
U1
Pulse
3
EN
V bat
5
C1
4.7 m F
L1
22 m H
GND
GND
2
1
GND
FB
V out
4
D1
MBR0530
C2
NCP5007
1.0 m F
GND
R1
22 W
D6
LED
D5
LED
D4
LED
D3
LED
D2
LED
GND
Figure 9. Basic Schematic Diagram
http://onsemi.com
8
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