參數(shù)資料
型號(hào)： NCP9003
廠商： ON SEMICONDUCTOR
英文描述： Compact Backlight LED Boost Driver
中文描述： 緊湊型背光LED升壓驅(qū)動(dòng)器
文件頁(yè)數(shù)： 8/22頁(yè)
文件大?。?/td> 294K
代理商： NCP9003
NCP9003
http://onsemi.com
8
Output Current Range Set
Up
The current regulation is achieved by means of an external sense resistor connected in series with the LED string.
CONTROLLER
GND
3
FB
GND
1
V
out
D1
L
Q1
Figure 8. Output Current Feedback
V
bat
L1
22 H
R1
x
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:
Feedback Threshold
Iout
R1
200 mV
10 mA
20
(eq. 9)
A standard 5% tolerance resistor, 22 SMD device,
yields 9.09 mA, good enough to fulfill the back light
demand. The typical application schematic diagram is
provided in Figure 9.
Figure 9. Basic Schematic Diagram
GND
EN
2
3
1
5
V
out
V
bat
NCP9003
L1
22 H
V
bat
C1
4.7 F
GND
D6
D5
D4
D3
U1
4
D2
GND
FB
GND
R1
22
D1
MBR0530
GND
C2
1.0 F
Pulse
LWT67C LWT67C LWT67C LWT67C LWT67C
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