LTC3803
16
3803fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2003
LT 0610 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIONS
PART NUMBER DESCRIPTION COMMENTS
LT3573 Isolated Flyback Switching Regulator with 60V
Integrated Switch
3V ≤ V
IN
≤ 40V, No Opto-Isolator or Third Winding Required, Up to 7W
Output Power, MSOP-16E
LTC3805/
LTC3805-5
Adjustable Constant Frequency Flyback, Boost, SEPIC
DC/DC Controller
V
IN
and V
OUT
Limited Only by External Components, 3mm × 3mm DFN-10,
MSOP-10E Packages
LTC3873/
LTC3873-5
No R
SENSE
™ Constant Frequency Flyback, Boost, SEPIC
Controller
V
IN
and V
OUT
Limited Only by External Components, 8-pin ThinSOT or
2mm × 3mm DFN-8 Packages
LT3757 Boost, Flyback, SEPIC and Inverting Controller 2.9V ≤ V
IN
≤ 40V, 100kHz to 1MHz Programmable Operating Frequency,
3mm × 3mm DFN-10 and MSOP-10E Package
LT3758 Boost, Flyback, SEPIC and Inverting Controller 5.5V ≤ V
IN
≤ 100V, 100kHz to 1MHz Programmable Operating Frequency,
3mm × 3mm DFN-10 and MSOP-10E
LTC1871/LTC1871-1/
LTC1871-7
Wide Input Range, No R
SENSE
Low Quiescent Current
Flyback, Boost and SEPIC Controller
Programmable Operating Frequency, 2.5V ≤ V
IN
≤ 36V, Burst Mode
®
Operation at Light Load, MSOP-10
Synchronous Flyback 3.3V
OUT
Synchronous Flyback 5V
OUT
90% Effi cient Synchronous Flyback Converter
I
TH
/RUN
LTC3803
GND
GATE
SENSE
V
OUT
*
3.3V
1.5A
3803 TA04a
D1
C
IN
33k
Q1
Q2
T1: PULSE ENGINEERING PA1006
Q1: FAIRCHILD FDC2512
Q2: VISHAY Si9803
D1: PHILIPS BAS516
C
IN
: TDK 1µF, 100V, X5R
C
O
: TDK 100µF, 6.3V, X5R
R
CS
: VISHAY OR IRC, 80mΩ
*FOR 5V OUTPUT CHANGE R
FB
TO 42.2k
T1
•
•
0.1µF
•
1n
8.06k
25.5k*
R
FB
V
OUT
V
CC
V
IN
36V TO 72V
V
FB
= 0.8V
270k
1µF
10V
560
5k
C
O
R
CS
1
2
3
6
5
4
OUTPUT CURRENT (A)
0.5
EFFICIENCY (%)
90
91
3803 TA04b
89
88
1.0
1.5
2.0
OUTPUT CURRENT (A)
0.5
92
91
90
89
88
87
86
85
2.0
3803 TA04c
1.0 1.5 2.5
EFFICIENCY (%)
