LT1171HVCQ データシートの表示（PDF） - Linear Technology
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LT1171HVCQ Datasheet PDF : 20 Pages
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LT1170/LT1171/LT1172
TYPICAL APPLICATIO S
D3†
1N4001
+
C4
1µF
Positive-to-Negative Buck-Boost Converter
R5†
470Ω, 1W
VIN
VSW
LT1170
FB
GND
VC
R3
5k
C2
0.1µF
VIN
10V TO
+
30V
C5
100µF*
R1
10.7k
D2 R4
1N914 47Ω
* REQUIRED IF INPUT LEADS ≥ 2"
** PULSE ENGINEERING 92114, COILTRONICS 50-2-52
† 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.
+
R2
1.24k
C3
2µF
D1
L1**
50µH
+ C1†
1000µF
R6
470Ω
VOUT
–12V
2A
1170/1/2 TA10
High Efficiency Constant Current Charger
INPUT VOLTAGE
> VBAT + 2V < 35V
D1
1N5819
C1 +
200µF
35V
C2 +
2.2µF
35V
TANTALUM
RUN = 0V
SHUTDOWN = 5V
VSW
LT1171
VIN
GND
FB
VC
+
C3
0.47µF
R2
1k
C4
0.01µF
2N3904
R6
78k
R7
R8
22k 1k
D2
MBR340
R3
25k
V+
–
LT1006
V–
+
R5
0.05Ω
ICHRG =
1.244V • R4
R3 • R5
= 1A AS SHOWN
* L2 REDUCES RIPPLE CURRENT INTO
THE BATTERY BY ABOUT 20 :1.
IT MAY BE OMITTED IF DESIRED.
R4
1k
L1
100µH, 1A
L2*
10µH, 1A
+ C4 1A
200µF
25V
+
BATTERY
2V TO 25V
INPUT VOLTAGE†
4.5V TO 20V
+
10µF
TANT
1170/1/2 TA11
Backlight CCFL Supply (see AN45 for details)
1k
1N5818
E2
V IN
VSW
LT1172
E1 GND
VC FB
2µF
L2***
L1**
300µH
A
Q1*
33pF
3kV
LAMP
0.02µF
Q2*
B
D1
1N914
R3
10k
D2
1N914
R1
560Ω
50k
INTENSITY
ADJUST
C6
* Q1,Q2 = BCP56 OR MPS650/561
1µF
** COILTRONICS CTX300-4
*** SUMIDA 6345-020 OR COILTRONICS 110092-1
1170/1/2 TA12
† A MODIFICATION WILL ALLOW OPERATION DOWN TO 4.5V. CONSULT FACTORY.
12
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