LT1725是General Purpose Isolated Flyback Controller

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LT1725 - LT1725是General Purpose Isolated Flyback Controller

LT1725是Linear公司的一款反激式、正激式和隔离式控制器产品，LT1725是General Purpose Isolated Flyback Controller，本站介绍了LT1725的封装应用图解、特点和优点、功能等，并给出了与LT1725相关的凌力尔特元器件型号供参考。

LT1725 - General Purpose Isolated Flyback Controller

LT1725 - General Purpose Isolated Flyback Controller - Linear Technology（凌力尔特）

功能描述

The LT1725 is a monolithic switching regulator controller 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 information, 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 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 implements a soft-start function. A 3V output is available at up to several mA for powering primary side application circuitry.

特点

Drives External Power MOSFET with External ISENSE 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

Available in 16-Pin SO and SSOP Packages

Optional Load Compensation

Optional Undervoltage Lockout

应用

Telecom Isolated Converters

Offline Isolated Power Supplies

Instrumentation Power Supplies

以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LT1725CGN	SSOP-16	C	$3.55	$3.00
LT1725CGN#PBF	SSOP-16	C	$3.55	$3.00
LT1725CGN#TR	SSOP-16	C		$3.06
LT1725CGN#TRPBF	SSOP-16	C		$3.06
LT1725CS	SO-16	C	$3.43	$2.90
LT1725CS#PBF	SO-16	C	$3.43	$2.90
LT1725CS#TR	SO-16	C		$2.96
LT1725CS#TRPBF	SO-16	C		$2.96
LT1725IGN	SSOP-16	I	$4.14	$3.50
LT1725IGN#PBF	SSOP-16	I	$4.14	$3.50
LT1725IGN#TR	SSOP-16	I		$3.56
LT1725IGN#TRPBF	SSOP-16	I		$3.56
LT1725IS	SO-16	I	$4.03	$3.40
LT1725IS#PBF	SO-16	I	$4.03	$3.40
LT1725IS#TR	SO-16	I		$3.46
LT1725IS#TRPBF	SO-16	I		$3.46