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LT1725

更新时间： 2024-11-18 04:19:39
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
28页 189K
描述
General Purpose Isolated Flyback Controller

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中文翻译

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LT1725 数据手册

 浏览型号LT1725的Datasheet PDF文件第2页浏览型号LT1725的Datasheet PDF文件第3页浏览型号LT1725的Datasheet PDF文件第4页浏览型号LT1725的Datasheet PDF文件第5页浏览型号LT1725的Datasheet PDF文件第6页浏览型号LT1725的Datasheet PDF文件第7页 
LT1725  
General Purpose  
Isolated Flyback Controller  
U
FEATURES  
DESCRIPTIO  
The LT®1725 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  
poweredfromathirdtransformerwinding. Thesefeatures  
allow for an application input voltage limited only by  
external power path components. The third transformer  
winding also provides output voltage feedback informa-  
tion, such that an optoisolator is not required. Its gate  
drive capability coupled with a suitable external MOSFET  
can deliver load power up to tens of watts.  
■
Drives External Power MOSFET with External  
I
SENSE Resistor  
■
■
Application Input Voltage Limited Only by  
External Power Components  
Senses Output Voltage Directly from Primary Side  
Winding—No Optoisolator Required  
Accurate Regulation Without User Trims  
Regulation Maintained Well into Discontinuous Mode  
Switching Frequency from 50kHz to 250kHz with  
External Capacitor  
Optional Load Compensation  
Optional Undervoltage Lockout  
Available in 16-Pin SO and SSOP Packages  
■
■
■
■
■
■
The LT1725 has a number of features not found on most  
other switching regulator ICs. By utilizing current mode  
switchingtechniques, itprovidesexcellentACandDCline  
regulation. Its unique control circuitry can maintain regu-  
lation well into discontinuous mode in most applications.  
Optionalloadcompensationcircuitryallowsforimproved  
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. A 3V output is available at up to several mA  
for powering primary side application circuitry.  
U
APPLICATIO S  
■
Telecom Isolated Converters  
■
Offline Isolated Power Supplies  
■
Instrumentation Power Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
48V to Isolated 5V Converter  
CTX02-14989  
6
Output Load Regulation  
470pF  
5.25  
LT1725  
18Ω  
V
36V TO 72V  
IN  
35.7k  
1%  
BAS16  
3V  
FB  
OUT  
1
V
IN  
= 48V  
V
V
= 36V  
= 72V  
IN  
22Ω  
47k  
V
I
= 5V  
= 0 to 2A  
3.01k  
1%  
OUT  
OUT  
V
CC  
SFST  
VC  
IN  
2
9
1nF  
47pF  
+
12CWQ06  
15µF  
1µF  
5.00  
4.75  
51Ω  
1W  
68Ω  
OSCAP  
11  
150pF  
820k  
33k  
UVLO  
t
ON  
10  
+
51k  
1.5µF  
100pF  
150µF  
ENDLY  
51k  
51k  
2.7k  
4
12  
MENAB  
0
0.5  
1.0  
1.5  
2.0  
I
(A)  
LOAD  
GATE  
R
IRF620  
OCMP  
1725 F10b  
I
R
SENSE  
CMPC  
SGND  
PGND  
0.1µF  
0.18Ω  
1725 TA01a  
1725f  
1
1234567...28

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