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KDR730E View Datasheet(PDF) - KEC

Part NameDescriptionManufacturer
KDR730E BICD LINEAR INTEGRATED CIRCUIT KEC
KEC KEC
KDR730E Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
KAB3403T/DN
TYPICAL APPLICATION
L1
4.7µH ~ 22µH D1
VIN
C1
1µF
ON
OFF
Shutdown and
Dimming control
VCC
SW
OVD
KAB3403T/DN
CTL
FB
GND
VOUT
LED1
LED2
LED3
C2
1µF
LED4
VFB
R1
16
BLOCK DIAGRAM
VCC
CONVERSION EFFICIENCY
90
85
80
75
70
3.0V
3.6V
65
4.3V
5.0V
60
0 5 10 15 20 25 30 35
LOAD CURRENT (mA)
SW
OVD
I sens
Comparator
RQ
S
Driver
OVER
VOLTAGE
DETECTION
CTL
Ramp
Generator
1.1MHz
Oscillator
Soft
Start
Error
Amp
Dimming
Shutdown
Reference
Generator
Vref (320mV)
GND
FB
figure 2. KAB3403T/DN Block Diagram
PIN FUNCTIONS
NO.
SYMBOL
KAB3403T KAB3403DN
FUNCTION AND CONNECTION.
6
1
VCC Input supply pin. Must be locally bypassed.
5
2
GND Ground pin. Connect directly to local ground plane,
4
3
FB
Feedback pin. Reference voltage is 320mV. Connect cathode of lowest LED and resistor here.
3
4
SW Switch pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
2
5
OVD Over output voltage detect pin. Connect cathode of schottky diode and anode of highest LED.
Control pin : Shutdown or dimming control. Connect external enable or dimming circuits.
1
6
CTL
Shutdown mode (IF = 0) : VCTL<1.0V
Dimming control mode : (IF = 12% ~ 100%, depend on VCTL)
2007. 2. 26
Revision No : 0
2/7
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