LTC3721-1
16
sn37211 37211fs
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2004
LT/TP 0504 1K • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1431 Reference and Opto-Driver Drives Opto-Coupler
LT1681/LT3781 Synchronous Forward Controllers High Efficiency 2-Switch Forward Control
LTC1693-1 Dual MOSFET Gate Drivers High Speed MOSFET Gate Drivers
LT1950 Single Switch Forward Converter Controller Auxillary Boost Converter, Programmable Volt-SPC Clamp
LTC3722-1/LTC3722-2 Dual Mode Phase Modulated Full-Bridge Controllers ZVS Full-Bridge Controllers
LT3804 Secondary Side Dual Output Controller with Opto Driver Regulates Two Secondary Outputs; Optocoupler Feedback Driver and
Second Output Synchronous Driver Controller
LTC3901 Secondary Side Synchronous Driver for Push-Pull Fault Timer, Reverse Current Sense, SO8
and Full Bridge Converters
LTC3723-1/LTC3723-2 Synchronous Push-Pull Controllers Highest Efficiency Push-Pull Controllers
LTC4440 100V High Side MOSFET Driver SOT-23 and MSOP; 1.6Ω Pull-Down, 2.4A Pull-Up
TYPICAL APPLICATIO
U
•
•
C1
1µF
100V
C9
39µF
100V
43
37211 TA02
+V
OUT
48V/3.65A
MBRB20200CT
100k
1k
T2
0.59mH
PULSE
P0353
COEV MGPWG-00001
EFD25 (1.28" x 1" x 0.504")
4T (42µH) CT: 10T CT: 10T CT
(PINS 1 TO 6, 7 TO 9, 11 TO 12)
•
21
•
330pF
C10
2.2nF
250V
+
11
12
•
10
4
3
1
6
2k
NOTES:
T2, C1, C9 ARE OPTIONAL AND
REDUCE OUTPUT RIPPLE TO LESS
THAN 50mV
P-P
.
10mA MINIMUM LOAD REQUIRED.
START VOLTAGE 10.8V MAX.
C2-C5: TDK C4532X7R1336M (1812)
C10: MURATA DE2E3KH222MB3B
C1: TDK C3225X7R2A105M (1210)
C6, C7: SANYO 35MV56WX
C9: SANYO 100MV39AX
C8: TDK C3216X7R2A104M (X7R 1206)
D1, D2: MMBZ5239B
R1, R2: IRC LRC-LR2512-01-R010-G
L1, L2: TDK SLF12575T-220M4R0
2xSi7370DP2xSi7370DP
5.1Ω
1/2W
1nF
200V
5.1Ω
1/2W
1nF
200V
1.21k
R1
0.01Ω
1.5W
R2
0.01Ω
1.5W
C2, C3, C4, C5
4x33µF
16V
V
IN
+V
IN
12V
IN
–V
IN
3 2 4
4610
6
5 7
18
1914137128
11
5
15
6
5
1
2
+V
S
24V
46.1k
10k
2.49k
1nF
100V
1.5k
1/4W
10nF
–V
S
GND-F
V
+
GND-S RMID
COLL REF
COMP RTOP
LT1431CS8
MOC207
1.2k
10k
470Ω
470Ω
33k
1µF 1.5nF
68nF270pF
1µF
1nF
100k
V
IN
5V
107k
73.2k
4.7Ω
1/4W
FMMT718
4.7Ω
1/4W
FMMT718
D1
9.1V
MMBT3904LT1
D2
9.1V
L1
22µH
160Ω
2W
180pF
200V
C64
180pF
200V
160Ω
2W
+V
S
–V
S
•
MBRB20200CT
8
9
•
7
L2
22µH
24V
C7
56µF
35V
+
C6
56µF
35V
+
C8
0.1µF
100V
LOAD CURRENT (A)
1.0
EFFICIENCY (%)
92
91
90
89
88
1.5 2.0 2.5 3.0
3.5 4.0
10.6V
IN
12V
IN
13.2V
IN
–V
OUT
LTC3721EGN-1
V
REF
DPRGSSFBGNDR
LEB
C
T
DRVB
COMP
V
CC
UVLO
DRVA CS
