LTC3805-5 Linear Technology, LTC3805-5 Datasheet - Page 20

• Manufacturer Part Number: LTC3805-5
• Description: Adjustable Frequency Current Mode Flyback DC/DC Controller
• Manufacturer: Linear Technology

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RELATED PARTS
LTC3805-5
TYPICAL APPLICATION
PART NUMBER
LT1424-5
LT1424-9
LT1425
LT1725
LTC1871
LT1950
LT1952/LT1952-1
LTC3706/LTC3705 Isolated Synchronous Forward Converter Chip Set
LTC3726/LTC3725 Isolated Synchronous Forward Converter Chip Set
LTC3803
LTC3803-3
LTC3803-5
LTC3805
LTC3806
LT3825
LT3837
LTC3873
LTC3873-5
PolyPhase is a registrated treademark of Linear Technology Corporation. No R
20
5V TO 40V
470pF
V
IN
100pF
V
CC
20k
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
2.2μF
100V
75k
0.1μF
1
2
3
4
5
C
SS
SSFLT
I
FB
RUN
FS
TH
DESCRIPTION
Isolated Flyback Switching Regulator
Isolated Flyback Switching Regulator
Isolated Flyback Switching Regulator
General Purpose Isolated Flyback Controller
Wide Input Range, No R
Flyback and SEPIC Controller
Single Switch PWM Controller with Auxiliary Boost
Converter
Single Switch Synchronous Forward Controllers
with PolyPhase
Constant-Frequency Current Mode Flyback DC/DC
Controllers in ThinSOT
Adjustable Frequency Current Mode DC/DC Controller
Synchronous Flyback DC/DC Controller
Isolated No-OPTO Synchronous Flyback Controller
with Wide Input Supply Range
Isolated No-OPTO Synchronous Flyback Controller
No R
Flyback and SEPIC DC/DC Controllers
5V-40V to 12V/1A Nonisolated Flyback Converter
LTC3805-5
2.2μF
100V
GND
PDZ6.8B
U1
11
SENSE
6.8V
●
I
SENSE
GATE
SYNC
FAX: [phone]
V
OC
CC
Constant Frequency Current Mode Boost,
10
9
8
7
6
10k
V
CC
®
Capability
3.01k
MMBTA42
4.7μF
680Ω
SENSE
BAS516
D2
●
TM
www.linear.com
150pF
FDC2512
200V
R
0.005Ω
Current Mode Boost,
SENSE
4
1
220Ω
T3772
7
8
10
9
UPS840
D1
100μF
16V
COMMENTS
5V Output Voltage, No Optoisolator Required
9V Output Voltage, Regulation Maintained Under Light Loads
No Third Winding or Optoisolator Required
Suitable for Telecom 36V to 75V Inputs
Programmable Frequency from 50kHz to 1MHz in MSOP-10 Package.
Wide Input Range Forward, Flyback, Boost or SEPIC Controller Suitable for
36V to 72V Inputs
Ideal for High Power 48V Input Applications
Ideal for High Power 48V Input Applications
Ideal for High Power 48V Input Applications
Wide Input Range Flyback, Boost and SEPIC Controller. High Temperature
Grade Available
Wide Input Range Flyback, Boost and SEPIC Controller with Programmable
Frequency, Run and Soft-Start
Current Mode Flyback Controller with Synchronous Gate Drive
Input Voltage Limited Only by External Components, Ideal for 48V Input
Applications
Suitable for Industrial 9V to 36V Inputs
Programmable Soft-Start, Adjustable Current Limit, 2mm × 3mm DFN or
8-Lead TSOT-23 Packages
SENSE
is a Trademark of Linear Technology Corporation.
100μF
16V
38055 TA02
51.1k
V
12V
1A
3.65k
OUT
47pF
90
80
70
60
50
40
30
20
10
0.01
© LINEAR TECHNOLOGY CORPORATION 2008
Effi ciency and Power Loss
vs Load Current
LOAD CURRENT (A)
0.1
LT 0408 REV A • PRINTED IN USA
1
38055 TA02b
5.5V
10V
20V
30V
40V
10
38055fa
8
7
6
5
4
3
2
1
0