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LT1171HVC Datasheet(PDF) 12 Page - Linear Technology

Part # LT1171HVC
Description  100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1171HVC Datasheet(HTML) 12 Page - Linear Technology

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12
LT1170/LT1171/LT1172
Positive-to-Negative Buck-Boost Converter
High Efficiency Constant Current Charger
Backlight CCFL Supply (see AN45 for details)
C4
1
µF
VIN
10V TO
30V
1170/1/2 TA10
R3
5k
C5
100
µF*
D3†
1N4001
C2
0.1
µF
VIN
VC
FB
VSW
LT1170
GND
VOUT
–12V
2A
REQUIRED IF INPUT LEADS
≥ 2"
PULSE ENGINEERING 92114, COILTRONICS 50-2-52
*
**
R2
1.24k
L1**
50
µH
R5†
470
Ω, 1W
TO AVOID STARTUP PROBLEMS FOR INPUT VOLTAGES
BELOW 10V, CONNECT ANODE OF D3 TO VIN, AND
REMOVE R5. C1 MAY BE REDUCED FOR LOWER OUTPUT
CURRENTS. C1
≈ (500µF)(IOUT).
FOR 5V OUTPUTS, REDUCE R3 TO 1.5k, INCREASE C2 TO
0.3
µF, AND REDUCE R6 TO 100Ω.
†
C3
2
µF
D2
1N914
R4
47
Ω
C1†
1000
µF
D1
R6
470
Ω
R1
10.7k
+
+
+
+
D2
MBR340
1170/1/2 TA11
INPUT VOLTAGE
> VBAT + 2V < 35V
C2
2.2
µF
35V
TANTALUM
R7
22k
R8
1k
C3
0.47
µF
V+
V–
R4
1k
C4
200
µF
25V
BATTERY
2V TO 25V
L2*
10
µH, 1A
L1
100
µH, 1A
R5
0.05
Ω
R3
25k
R2
1k
RUN = 0V
SHUTDOWN = 5V
* L2 REDUCES RIPPLE CURRENT INTO
THE BATTERY BY ABOUT 20 :1.
IT MAY BE OMITTED IF DESIRED.
I
=
1.244V • R4
R3 • R5
= 1A AS SHOWN
CHRG
R6
78k
VIN
C
V
FB
VSW
GND
D1
1N5819
C4
0.01
µF
LT1006
+
–
+
LT1171
C1
200
µF
35V
1A
2N3904
+
+
+
+
GND
2
µF
1170/1/2 TA12
D1
1N914
33pF
3kV
10
µF
TANT
R3
10k
50k
INTENSITY
ADJUST
1N5818
L1**
300
µH
INPUT VOLTAGE†
4.5V TO 20V
Q1,Q2 = BCP56 OR MPS650/561
COILTRONICS CTX300-4
SUMIDA 6345-020 OR COILTRONICS 110092-1
A MODIFICATION WILL ALLOW OPERATION DOWN TO 4.5V. CONSULT FACTORY.
*
**
***
†
C6
1 F
µ
R1
560
Ω
1k
LT1172
IN
V
VC
VSW
E2
E1
D2
1N914
LAMP
FB
L2***
0.02
µF
A
B
Q1*
Q2*
+
TYPICAL APPLICATIO S



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