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參數(shù)資料
| 型號： | KDR720E |
| 廠商： | KEC Holdings |
| 英文描述： | White LED Step-Up Converter |
| 中文描述： | 白光LED升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 421K |
| 代理商： | KDR720E |
2007. 2. 26
5/7
KAB3403T/DN
Revision No : 0
4. Using a Logic Signal to FB pin.
For application that need to adjust the LED current in discrete
steps. A logic signal can be used as shown in Figure 9.
Figure9. Using a Logic Signal to FB pin.
R
V
CC
V
IN
GND
SW
C1
1
μ
F
C2
1
μ
F
R1
R2
D1
CTL
FB
OVD
LED1
LED2
LED3
LED4
L1
4.7
μ
H ~ 22
μ
H
L1
4.7
μ
H ~ 22
μ
H
SW
C1
1
μ
F
C2
1
μ
F
D1
CTL
FB
OVD
LED1
LED2
LED3
LED4
GND
V
CC
V
IN
R1
16
DC
KAB3403T/DN
V
CC
V
IN
GND
SW
C3
1
μ
F
C2
1
μ
F
R
R1
1
5
k
D1
CTL
FB
OVD
LED1
LED2
LED3
LED4
PWM
Signal
L1
4.7
μ
H ~ 22
μ
H
C1
1
μ
F
KAB3403T/DN
KAB3403T/DN
R
V
CC
V
IN
GND
SW
C1
1
μ
F
C2
1
μ
F
R1
D1
CTL
FB
OVD
LED1
LED2
LED3
LED4
KTLOGIC
L1
4.7
μ
H ~ 22
μ
H
KAB3403T/DN
Figure6. Using a DC Signal to CTL pin.
2. Using a filtered PWM Signal to CTL pin.
The filtered PWM signal can be considered as an adjustable DC
voltage. It can be used to replace the variable DC Voltage source
in dimming control. The circuit is shown in Figure 7
Figure7. Using a filtered PWM Signal to CTL pin.
3. Using a DC Voltage to FB pin.
The dimming control using a DC control voltage to FB pin of the
KAB3403T/DN is shown in Figure. The LED current can be
varied applying a DC voltage to the FB pin. The voltage can come
from a filtered PWM signal. It can be used to replace the variable
DC voltage source in dimming control.
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