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KDR720E View Datasheet(PDF) - KEC

Part Name
Description
Manufacturer
KDR720E Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
KAB3403T/DN
L1
4.7µH ~ 22µH D1
VIN
VCC
SW
LED1
C1
OVD
LED2
1µF
C2
KAB3403T/DN LED3
1µF
DC
LED4
CTL
FB
GND
R1
16
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
L1
4.7µH ~ 22µH D1
VIN
C1
1µF
VCC
SW
OVD
LED1
LED2
C2
R1
LED3
KAB3403T/DN
1µF
15k
LED4
CTL
PWM
FB
Signal C3
1µF
GND
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.
VIN
C1
1µF
L1
4.7µH ~ 22µH
D1
VCC
SW
OVD
KAB3403T/DN
CTL
FB
GND
LED1
LED2
LED3
C2
1µF
LED4
R1 KTK5132V
LOGIC
Figure9. Using a Logic Signal to FB pin.
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.
L1
4.7µH ~ 22µH
D1
VIN
LED1
VCC
SW
OVD
LED2
KAB3403T/DN
C2
LED3
1µF
LED4
CTL
FB
C1
GND
R1
1µF
R2
2007. 2. 26
Revision No : 0
5/7
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