LT1372/LT1377
U
TYPICAL APPLICATIONS N
Positive-to-Negative Converter with Direct Feedback
Dual Output Flyback Converter with Overvoltage Protection
V
IN
R2
1.21k
1%
R1
13k
1%
2.7V TO 16V
T1*
+
2
4
3
C1
D2
+
•
V
IN
22µF
C4
P6KE-15A
D3
MBRS140T3
T1*
5
2.7V TO 13V
47µF
V
OUT
15V
•
V
IN
1N4148
†
+
1
4
8
3
2, 3
5
–V
ON
OUT
C1
22µF
+
V
S/S
SW
•
OFF
P6KE-20A
C4
–5V
R2
2.49k
1%
D1
MBRS130LT3
47µF
2
5
LT1372/LT1377
NFB
GND
6, 7
4
8
1N4148
•
•
FB
S/S
V
IN
V
4
8
3
6, 7
ON
+
R3
2.49k
1%
SW
OFF
C5
47µF
V
C
LT1372/LT1377
NFB
GND
6, 7
1
1
–V
OUT
C2
0.047µF
R1
2k
–15V
R4
12.1k
1%
*COILTRONICS CTX10-2 (407) 241-7876
†
MBRS140T3
V
C
MAX I
OUT
C3
0.0047µF
1
I
V
IN
OUT
R5
2.49k
1%
LT1372 • TA03
C2
0.047µF
R3
2k
0.3A 3V
0.5A 5V
0.75A 9V
C3
0.0047µF
*DALE LPE-4841-100MB (605) 665-9301
LT1372 • TA04
Low Ripple 5V to –3V “Cuk”† Converter
90% Efficient CCFL Supply
V
5mA MAX
LAMP
OUT
–3V
L1*
V
IN
5V
2
1
3
4
250mA
C2
D1
1N4148
10
27pF
T1
•
•
V
IN
5
4
3
2
1
R1
1k
C2
4.5V
+
47µF
TO 30V
1%
10µF
16V
C1
0.1µF
LT1372/LT1377
5
4
7
6
8
V
V
SW
IN
+
+
C1
22µF
10V
C6
0.1µF
S/S
3
1
Q1
Q2
GND
GND S
NFB
330Ω
V
C
C3
47µF
16V
D1**
+
D2
1N4148
L1
33µH
2.7V TO
5.5V
C5
0.0047µF
+
R4
2k
R2
4.99k
1%
1N5818
8
2.2µF
5
C4
0.047µF
V
IN
562Ω*
10k
4
ON
S/S
V
SW
OFF
*SUMIDA CLS62-100L
LT1372 • TA05
20k
DIMMING
**MOTOROLA MBR0520LT3
LT1372/LT1377
†
PATENTS MAY APPLY
2
V
FB
GND
6, 7
V
C
0.1µF
22k
1N4148
1
+
2µF
OPTIONAL REMOTE
DIMMING
LT1372 • TA06
C1 = WIMA MKP-20
L1 = COILCRAFT DT3316-333
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
T1 = COILTRONICS CTX 110609
* = 1% FILM RESISTOR
CCFL BACKLIGHT APPLICATION CIRCUITS
CONTAINED IN THIS DATA SHEET ARE
COVERED BY U.S. PATENT NUMBER 5408162
AND OTHER PATENTS PENDING
DO NOT SUBSTITUTE COMPONENTS
COILTRONICS (407) 241-7876
COILCRAFT (708) 639-6400
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
11
Linear [ Linear ]
