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CAT37 Datasheet(PDF) 9 Page - Texas Instruments

Part # CAT37
Description  CMOS White LED Driver Boost Converter
PDF  13 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CAT37 Datasheet(HTML) 9 Page - Texas Instruments

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CAT37
© Catalyst Semiconductor, Inc.
9
Doc. No. MD-5005 Rev. T
Characteristics subject to change without notice
TYPICAL APPLICATION CIRCUITS
Two LEDs with DC Level Dimming Control
15mA
R1
6.34kΩ
1k
18k
L1
6.8µH
VDC
Dimming
2
3
1
5
4
SW
VIN
SHDN
D1
C2
1µF
C1
1µF
VIN
3V to 4.2V
CAT37
FB
GND
Efficiency – Two LEDs
Three LEDs with DC Level Dimming Control
15mA
R1
6.34kΩ
1k
18k
L1
6.8µH
VDC
Dimming
2
3
1
5
4
SW
VIN
SHDN
D1
C2
1µF
C1
1µF
VIN
3V to 4.2V
CAT37
FB
GND
Efficiency –- Three LEDs
Four LEDs with PWM Dimming Control
Efficiency – Four LEDs
60
65
70
75
80
85
90
0
5
10
15
20
25
30
LED CURRENT [mA]
VIN=3.0V
VIN=3.6V
VIN = 3.6V
VIN = 3.0V
60
65
70
75
80
85
90
0
5
10
15
20
25
30
LED CURRENT [mA]
VIN=3.0V
VIN=3.6V
VIN = 3.6V
VIN = 3.0V
60
65
70
75
80
85
90
0
5
10
15
20
25
30
LED CURRENT [mA]
VIN = 3.0V
VIN = 3.6V
VIN = 3.0V
VIN = 3.6V
15mA
R1
6.34kΩ
1k
18k
0.1µF
10k
L1
6.8µH
PWM
2
3
1
5
4
SW
VIN
SHDN
D1
C2
1µF
C1
1µF
VIN
3V to 4.2V
CAT37
FB
GND



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