LTC3805-5
20
38055fe
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2008
LT 0511 REV E • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
5V to 40V to 12V/1A Nonisolated Flyback Converter
LOAD CURRENT (A)
0.01
50
EFFICIENCY (%)
POWER LOSS (W)
70
90
0.1 1 10
38055 TA02b
30
40
60
80
20
10
4
6
8
2
1
3
5
7
0
5.5V
10V
20V
30V
40V
Efficiency and Power Loss
vs Load Current
75k
3.01k
4.7µF
100µF
16V
51.1k
47pF
C
SS
0.1µF
D1
UPS840
FDC2512
V
CC
11
5
4
3
2
1
6
7
8
1
4
10
8
7
9
9
10
220Ω
150pF
200V
38055 TA02
2.2µF
100V
V
IN
5V TO 40V
V
CC
U1
LTC3805-5
I
TH
GND
SSFLT
RUN
GATE
OC
I
SENSE
SYNCFS
FB
V
CC
100µF
16V
R
SENSE
0.005Ω
V
OUT
12V
1A
470pF
100pF
20k
3.65k
2.2µF
100V
10k
6.8V
PDZ6.8B
680Ω
D2
BAS516
T3772
MMBTA42
PART NUMBER DESCRIPTION COMMENTS
LT3748 100V No Opto Flyback Controller 5V ≤ V
IN
≤ 100V, Boundary Mode Operation, MSOP-16 with Extra High
Voltage Pin Spacing
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
LT3575 No Opto-Isolated Flyback with 60V Integrated Switch 3V ≤ V
IN
≤ 40V, Up to 14W, Boundary Mode Operation, TSSOP-16E
LTC3803/LTC3803-3/
LTC3803-5
Flyback DC/DC Controller with Fixed 200kHz or
300kHz Operating Frequency
V
IN
and V
OUT
Limited Only by External Components, 6-Pin ThinSOT™
Package
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
LT3825 No Opto-Isolated Synchronous Flyback Controller V
IN
16V to 75V Limited by External Components, Up to 60W, TSSOP-16E
