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LT1725IGN PDF预览

LT1725IGN

更新时间： 2024-11-19 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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LT1725IGN 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：SSOP包装说明：SSOP, SSOP16,.25
针数：16Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.1模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE最大输入电压：18 V
最小输入电压：11 V标称输入电压：14 V
JESD-30 代码：R-PDSO-G16JESD-609代码：e0
长度：4.8895 mm湿度敏感等级：1
功能数量：1端子数量：16
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：0.5 A封装主体材料：PLASTIC/EPOXY
封装代码：SSOP封装等效代码：SSOP16,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：235认证状态：Not Qualified
座面最大高度：1.75 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：SINGLE
最大切换频率：125 kHz温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.635 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：3.899 mm
Base Number Matches：1

LT1725IGN 数据手册

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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
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中文翻译

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