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KDR720E Datasheet(PDF) 5 Page - KEC(Korea Electronics)

Part # KDR720E
Description  White LED Step-Up Converter
Download  7 Pages
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Manufacturer  KEC [KEC(Korea Electronics)]
Direct Link  http://www.keccorp.com
Logo KEC - KEC(Korea Electronics)

KDR720E Datasheet(HTML) 5 Page - KEC(Korea Electronics)

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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.
VCC
VIN
GND
SW
C1
C2
R1
R2
D1
CTL
FB
OVD
1
µF
1
µF
LED1
LED2
LED3
LED4
L1
4.7
µH ~ 22µH
L1
4.7
µH ~ 22µH
SW
C1
1
µF
C2
1
µF
D1
CTL
FB
OVD
LED1
LED2
LED3
LED4
GND
VCC
VIN
R1
16
DC
KAB3403T/DN
VCC
VIN
GND
SW
C3
C2
R1
1
5kΩ
D1
CTL
FB
OVD
1
µF
1
µF
LED1
LED2
LED3
LED4
PWM
Signal
L1
4.7
µH ~ 22µH
C1
1
µF
KAB3403T/DN
KAB3403T/DN
VCC
VIN
GND
SW
C1
C2
R1
D1
CTL
FB
OVD
1
µF
1
µF
LED1
LED2
LED3
LED4
KTK5132V
LOGIC
L1
4.7
µH ~ 22µH
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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