参数资料
型号: LT1725IGN#TRPBF
厂商: Linear Technology
文件页数: 1/28页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO CM 16SSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 125kHz
占空比: 90%
电源电压: 最高 22V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LT1725
General Purpose
Isolated Flyback Controller
FEATURES
DESCRIPTIO
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 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 most
other switching regulator ICs. By utilizing current mode
switching techniques, it provides excellent AC and DC line
regulation. Its unique control circuitry can maintain regu-
APPLICATIO S
■ Telecom Isolated Converters
■ Offline Isolated Power Supplies
■ Instrumentation Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
48V to Isolated 5V Converter
CTX02-14989
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. A 3V output is available at up to several mA
for powering primary side application circuitry.
Output Load Regulation
35.7k
1%
LT1725
3V OUT
FB
BAS16
22 ?
V IN 36V TO 72V
6
1
18 ?
470pF
5.25
V IN = 36V
V IN = 48V
3.01k
1%
1nF
47pF
SFST
VC
V CC
+
15 μ F
47k
1 μ F
68 ?
2
9
12CWQ06
V OUT = 5V
I OUT = 0 to 2A
51 ?
1W
5.00
V IN = 72V
OSCAP
820k
150pF
11
51k
t ON
ENDLY
UVLO
100pF
33k
1.5 μ F
10
150 μ F
+
51k
51k
2.7k
MENAB
R OCMP
GATE
4
12
IRF620
4.75
0
0.5
1.0
I LOAD (A)
1.5
2.0
1725 F10b
R CMPC
I SENSE
0.1 μ F
SGND
PGND
0.18 ?
1725 TA01a
1725fa
1
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相关代理商/技术参数
参数描述
LT1725IS 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1725IS#PBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1725IS#TR 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1725IS#TRPBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR)
LT1737 制造商:LINER 制造商全称:Linear Technology 功能描述:High Power Isolated Flyback Controller