参数资料
型号: LT1171CT#FLOW-06PBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: 5.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PZFM5
封装: LEAD FREE, PLASTIC, TO-220, 5 PIN
文件页数: 6/24页
文件大小: 225K
代理商: LT1171CT#FLOW-06PBF
LT1170/LT1171/LT1172
14
117012fg
TYPICAL APPLICATIONS
Positive-to-Negative Buck-Boost Converter
C4
1μF
VIN
10V TO
30V
1170/1/2 TA10
R3
5k
C5
100μF*
D3
1N4001
C2
0.1μF
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**
50μH
R5
470Ω, 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
0.3μF, AND REDUCE R6 TO 100Ω.
C3
2μF
D2
1N914
R4
47Ω
C1
1000μF
D1
R6
470Ω
R1
10.7k
+
High Efficiency Constant Current Charger
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
200μF
25V
BATTERY
2V TO 25V
L2*
10
μH, 1A
L1
100
μH, 1A
R5
0.05Ω
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
2μF
1170/1/2 TA12
D1
1N914
33pF
3kV
10μF
TANT
R3
10k
50k
INTENSITY
ADJUST
1N5818
L1**
300μH
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
1μF
R1
560Ω
1k
LT1172
IN
V
VC
VSW
E2
E1
D2
1N914
LAMP
FB
L2***
0.02μF
A
B
Q1*
Q2*
+
Backlight CCFL Supply (see AN45 for details)
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