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參數(shù)資料
| 型號： | NCP9003 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Compact Backlight LED Boost Driver |
| 中文描述： | 緊湊型背光LED升壓驅動器 |
| 文件頁數(shù)： | 17/22頁 |
| 文件大?。?/td> | 294K |
| 代理商： | NCP9003 |
NCP9003
http://onsemi.com
17
Digital Control
Due to the EN pin, a digitally controlled luminosity can
be implemented by providing a PWM signal to this pin (see
Figure 31). The output current depends upon the Duty
Cycle, but care must be observed as the DC/DC converter
is continuously pulsed ON/OFF and noise are likely to be
generated.
Figure 31. Typical Semi
Pulsed Mode of Operation
EN
1
5
V
out
V
bat
R1
NCP9003
L1
22 H
V
bat
C1
4.7 F
GND
U1
4
2
GND
GND
FB
3
D1
MBR0530
22
GND
GND
Pulse
C2
1.0 F
NOTE: Pulse width and frequency depends upon the application constraints.
D6
D5
D4
D3
D2
LWT67C LWT67C LWT67C
LWT67C LWT67C
V
load
The PWM operation, using the EN pin as a digital
control, is depicted in Figures 32 and 33. The tests have
been carried out at room temperature with V
bat
= 3.60 V,
L = 22 H, five LEDs in series, RFB = 22 .
PWM
VFB
VPWM
V
load
Figure 32. Operation @ PWM = 10 kHz, DC = 10%
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