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
C1
D2
•
+
22µF
C4
P6KE-15A
D3
V
IN
5
47µF
MBRS140T3
T1*
2.7V TO 13V
•
V
IN
1N4148
V
OUT
†
1
3
4
8
3
–V
ON
OUT
V
15V
+
2, 3
5
S/S
SW
OFF
C1
22µF
–5V
+
R2
2.49k
1%
D1
MBRS130LT3
•
P6KE-20A
C4
LT1372/LT1377
NFB
GND
6, 7
47µF
2
5
4
8
1N4148
•
•
FB
S/S
V
IN
V
R3
2.49k
1%
4
8
3
6, 7
ON
+
V
SW
C
OFF
C5
47µF
1
LT1372/LT1377
NFB
GND
6, 7
1
–V
OUT
C2
0.047µF
R1
2k
*COILTRONICS CTX10-2 (407) 241-7876
†
–15V
R4
12.1k
1%
MAX I
OUT
MBRS140T3
C3
0.0047µF
V
C
I
V
IN
OUT
1
LT1372 • TA03
0.3A 3V
0.5A 5V
0.75A 9V
R5
2.49k
1%
C2
0.047µF
R3
2k
C3
0.0047µF
*DALE LPE-4841-100MB (605) 665-9301
LT1372 • TA04
90% Efficient CCFL Supply
Low Ripple 5V to –3V “Cuk”† Converter
5mA MAX
LAMP
C2
27pF
D1
1N4148
V
10
OUT
L1*
V
IN
–3V
5V
T1
2
1
3
4
250mA
V
IN
5
4
3
2
1
4.5V
•
•
+
TO 30V
10µF
C1
0.1µF
R1
1k
1%
C2
47µF
16V
5
4
7
6
8
V
V
SW
IN
Q1
Q2
+
+
C1
22µF
10V
C6
0.1µF
S/S
LT1372/LT1377
GND NFB
330Ω
3
1
D2
L1
33µH
2.7V TO
5.5V
GND S
V
C
C3
47µF
16V
1N4148
+
D1**
1N5818
8
2.2µF
+
5
C5
0.0047µF
R4
2k
V
R2
4.99k
1%
IN
562Ω*
10k
4
ON
S/S
V
SW
OFF
C4
0.047µF
20k
DIMMING
LT1372/LT1377
2
*SUMIDA CLS62-100L
LT1372 • TA05
V
FB
**MOTOROLA MBR0520LT3
†
GND
6, 7
V
C
PATENTS MAY APPLY
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 ]
