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CAT32
TYPICAL APPLICATION CIRCUITS
(The application diagrams below are shown for the TSOT ? 23 packages.)
VIN
6
VIN
L 1
6.8 m H
1
SW
D1
C1
4.7 m F
5
SHDN
CAT32
LED
3
C2
2.2 m F
2.5 V DC
DIMMING
CONTROL
RSET
4
60.40 k W
R SET
1.50 k W
GND
2
15 mA
Figure 16. Two LEDs with DC Level Dimming Control
VIN
6
L 1 6.8 m H
1
D1
85
V IN = 4.2 V
VIN
SW
80
V IN = 3.0 V
C1
4.7 m F
2.5 V DC
DIMMING
CONTROL
5
60.40 k W
CAT32
SHDN
RSET
4
R SET
1.50 k W
LED
GND
2
3
15 mA
C2
1 m F
75
70
65
60
0
5
10
15
20
LED CURRENT (mA)
Figure 17. Three LEDs with DC Level Dimming Control
Figure 18. Efficiency ? Three LEDs
VIN
L 1 6.8 m H
D1
85
C1
4.7 m F
6
VIN
1
SW
80
75
V IN = 4.2 V
V IN = 3.0 V
PWM
DIMMING
CONTROL
5
CAT32
SHDN
RSET
4
R SET
1.50 k W
LED
GND
2
3
15 mA
C2
1 m F
70
65
60
0
5
10
15
20
LED CURRENT (mA)
Figure 19. Four LEDs with PWM Dimming Control
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Figure 20. Efficiency ? Four LEDs
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