參數(shù)資料
型號(hào)： LT1725
廠商： Linear Technology Corporation
英文描述： Monolithic Switching Regulator for Isolated Flyback Controller(單片開(kāi)關(guān)穩(wěn)壓器(用于隔離回掃控制器))
中文描述： 單片開(kāi)關(guān)穩(wěn)壓器（單片開(kāi)關(guān)穩(wěn)壓器（用于隔離回掃控制器）的隔離反激式控制器）
文件頁(yè)數(shù)： 1/24頁(yè)
文件大小： 252K
代理商： LT1725
1
LT1725
General Purpose
Isolated Flyback Controller
November 2000
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
powered from a third transformer winding. These features
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.
The LT1725 has a number of features not found on other
switching regulator ICs presently available. By utilizing
current mode switching techniques, it provides excellent
AC and DC line regulation. Its unique control circuitry can
maintain regulation 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 imple-
ments a soft-start function. A 3V output is available at up
to several mA for powering primary side application
circuitry.
I
Drives External Power MOSFET with External
I
SENSE
Resistor
I
Application Input Voltage Limited Only by
External Power Components
I
Senses Output Voltage Directly from Primary Side
Winding—No Optoisolator Required
I
Accurate Regulation Without User Trims
I
Regulation Maintained Well into Discontinuous Mode
I
Switching Frequency from 50kHz to 250kHz with
External Capacitor
I
Available in 16-Pin GN and SO Packages
I
Optional Load Compensation
I
Optional Undervoltage Lockout
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
Telecom Isolated Converters
I
Offline Isolated Power Supplies
I
Instrumentation Power Supplies
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Final Electrical Specifications
FEATURES
DESCRIPTIOU
APPLICATIU
TYPICAL APPLICATIO
U
48V to ISO 5V Converter
PGND
I
SENSE
GATE
V
C
OSCAP
FB
R2
M1
IRF610
220
μ
H
74
μ
H
T1
10
μ
H
R13
V
CC
V
IN
V
IN
V
OUT
UVLO
3V
OUT
SGND
1725 TA01
R
CMPC
R
OCMP
MENAB
LT1725
R8
R7
C5
ENDLY
SFST
t
ON
C3
R9
R1
R6
R4
3k
R3
32.7k
R10
V
IN
R11
C1
C4
+
C2
D1
D1N5820
D2
D1N4148
+
C6
相關(guān)PDF資料
PDF描述
LT1737CS High Power Isolated Flyback Controller
LT1737IS High Power Isolated Flyback Controller
LT1737CGN High Power Isolated Flyback Controller
LT1737IGN High Power Isolated Flyback Controller
LT1737 High Power Switching Regulator for Isolated Flyback Controller(大功率，用于隔離回掃控制器的開(kāi)關(guān)穩(wěn)壓器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1725CGN 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LT1725CGN#PBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無(wú) 升壓:是 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR)
LT1725CGN#PBF 制造商:Linear Technology 功能描述:ICSMPS CONTROLLERCURRENT-MOD 制造商:Linear Technology 功能描述:IC,SMPS CONTROLLER,CURRENT-MODE,SSOP,16P
LT1725CGN#TR 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LT1725CGN#TRPBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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