LT1737

Manufacturer Part NumberLT1737
DescriptionLT1737High Power Isolated Flyback Controller
ManufacturerLinear Technology Corporation
LT1737 datasheet
 
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Page 1/28

Download datasheet (318Kb)Embed
Next
查询LT1737供应商
FEATURES
Drives External Power MOSFET
Supply Voltage Range: 4.5V to 20V
Flyback Voltage Limited Only by
External Components
Senses Output Voltage Directly from Primary Side
Winding—No Optoisolator Required
Switching Frequency from 50kHz to 250kHz
with External Capacitor
Moderate Accuracy Regulation Without User Trims
Regulation Maintained Well into Discontinuous Mode
External I
Resistor
SENSE
Optional Load Compensation
Optional Undervoltage Lockout
Shutdown Feature Reduces I
to 50 A Typ
Q
Available in 16-Pin GN and SO Packages
U
APPLICATIO S
Isolated Flyback Switching Regulators
Medical Instruments
Instrumentation Power Supplies
U
TYPICAL APPLICATIO
R2
35.7k
1%
D2
BAS16
Q1
2N3906
UVLO
FB
V
C
R3
OSCAP
t
ENDLY
ON
3.01k
1%
1nF
75k
47pF
Isolated Flyback Controller
DESCRIPTIO
®
The LT
1737 is a monolithic switching regulator control-
ler specifically designed for the isolated flyback topology.
It drives the gate of an external MOSFET and is generally
powered from a DC supply voltage. Output voltage feed-
back information may be supplied by a variety of methods
including a third transformer winding, the primary wind-
ing or even direct DC feedback (see Applications Informa-
tion). Its gate drive capability, coupled with a suitable
external MOSFET and other power path components, can
deliver load power up to tens of Watts.
The LT1737 has a number of features not found on other
isolated flyback controller ICs. By utilizing current mode
switching techniques, it provides excellent AC and DC line
regulation. Its unique control circuitry can maintain regu-
lation well into discontinuous mode in most applications.
Optional load compensation circuitry allows for improved
load regulation. An optional undervoltage lockout pin
halts operation when the application input voltage is too
low. An optional external capacitor implements a soft-
start function.
, LTC and LT are registered trademarks of Linear Technology Corporation.
12V-18V to Isolated 15V Converter
V
IN
+
C1
22 F
240k
150 H
C3
33k
0.1 F
V
CC
GATE
LT1737
I
SENSE
MINENAB
R
R
SGND
PGND
OCMP
CMPC
150k
100k
4.7k
0.1 F
LT1737
High Power
U
T1
D1
COILTRONICS
MBRS1100
CTX150-4
V
= 15V
OUT
I
= 300mA
+
OUT
R4
C2
150 H
7.5k
33 F
M1
IRFL014
R1
0.27
NOTE: SEE APPLICATIONS
INFORMATION FOR ADDITIONAL
COMPONENT SPECIFICATIONS
1737 TA01
1737f
1

LT1737 Summary of contents