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LT1307CS8 Datasheet(PDF) 17 Page - Linear Technology

Part # LT1307CS8
Description  Single Cell Micropower 600kHz PWM DC/DC Converters
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1307CS8 Datasheet(HTML) 17 Page - Linear Technology

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17
LT1307/LT1307B
TYPICAL APPLICATIONS N
Single Cell Powered Constant Current LED Driver
C1
1
µF
CERAMIC
L1
10
µH
D1
VIN
1307 TA05
NC
D2
40mA
R1
5.1
Ω
100k
ON/OFF
VIN
R2
22k
100k
C2
1
µF
CERAMIC
Q1
2N3906
AA
CELL
C3
22
µF
+
L1:MURATA-ERIE LQH3C100K04
D1:1N4148
C1, C2:CERAMIC
D2, D3:LUMEX SSL-X100133SRC/4 "MEGA-BRITE" RED LED
OR PANASONIC LNG992CF9 HIGH BRIGHTNESS BLUE LED
VIN
SW
FB
LT1307B
LBI
LBO
SHDN
VC
GND
Flash Memory VPP Supply
VIN
SW
FB
LT1307
L1
10
µH
D1
47k
232k
1%
2M
1%
1307 TA09
0.33
µF
CERAMIC
×2
12V/30mA FROM 3V
12V/60mA FROM 5V
~250mVP-P RIPPLE
0.33
µF
VC
GND
SHDN
SHUTDOWN
D1: MOTOROLA MBR0520L
L1: MURATA-ERIE LQH3C100K04
1
µF
TANTALUM
2000pF
1N4148
VIN
3V TO 5.5V
+
10pF
High Voltage Flyback Converter
VIN
VIN
1V TO 5V
SW
1N4148
4
6
3
1
•
•
LT1307
FB
SHDN
SHUTDOWN
VC
100k
1000pF
GND
R2
240k
1%
R1
2VOUT
VOUT
0.1
µF
1
µF
CERAMIC
0.01
µF
0.1
µF
1307 TA06
OPTIONAL
DOUBLER
T1
1:12
T1: DALE LPE3325-A190, n = 12 (605) 665-9301
MAXIMUM DUTY CYCLE:
≈80%
FOR FLYBACK, VOUT =
n(VIN – VSW)
VOUT = 1.22V 1 +
()R1
R2
DC
1 – DC
FOR 1VIN, MAXIMUM VOUT =
FOR 2VIN, MAXIMUM VOUT ≈ 85V.
HIGHER VOLTAGES ACHIEVED WITH CAPACITIVE DOUBLER OR TRIPLER
NO SNUBBER REQUIRED WITH SPECIFIED TRANSFORMER AND VIN < 5V
12(1 – 0.2)
≈ 37V
0.8
1 – 0.8



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