LT1737 High Power Isolated Flyback Controller

The LT®1737 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 DC supply voltage. Output voltage feedback information may be supplied by a variety of methods including a third transformer winding, the primary winding or even direct DC feedback (see Applications Information). Its gate drive capability coupled with a suitable external MOSFET and other power path components can deliver load power up to tens of Watts.

The LT1737 has a number of features not found on other isolated flyback controller 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 implements a soft-start function

产品特点 Features

Drives External Power MOSFET
Supply Voltage Range: 4.5V to 20V
Flyback Voltage Limited Only by External Components
Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required
Moderate Accuracy Regulation Without User Trims
Regulation Maintained Well into Discontinuous Mode
Switching Frequency from 50kHz to 250kHz with External Capacitor
Available in 16-Pin GN and SO Packages
Optional Load Compensation
Optional Undervoltage Lockout
External ISENSE Resistor
Shutdown Feature Reduces IQ to 50µA Typ

参数

应用

Isolated Flyback Switching Regulators
Medical Instruments
Instrumentation Power Supplies

典型应用图

LT1737 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT1737CGN	SSOP	16	C	$3.55	$3.00
LT1737CGN#PBF	SSOP	16	C	$3.55	$3.00
LT1737CGN#TR	SSOP	16	C		$3.06
LT1737CGN#TRPBF	SSOP	16	C		$3.06
LT1737CS	SO	16	C	$3.43	$2.90
LT1737CS#PBF	SO	16	C	$3.43	$2.90
LT1737CS#TR	SO	16	C		$2.96
LT1737CS#TRPBF	SO	16	C		$2.96
LT1737IGN	SSOP	16	I	$4.14	$3.50
LT1737IGN#PBF	SSOP	16	I	$4.14	$3.50
LT1737IGN#TR	SSOP	16	I		$3.56
LT1737IGN#TRPBF	SSOP	16	I		$3.56
LT1737IS	SO	16	I	$4.03	$3.40
LT1737IS#PBF	SO	16	I	$4.03	$3.40
LT1737IS#TR	SO	16	I		$3.46
LT1737IS#TRPBF	SO	16	I		$3.46

LT1737 数据手册及相关资料下载

数据手册(英文) : LT1737 - High Power Isolated Flyback Controller.PDF
设计要点 (英文) : DN260 - Isolated Flyback Converter Regulates Without an Optocoupler.PDF
设计要点 (英文) : DN338 - Power over Ethernet Isolated Power Supply Delivers 11.5W at 90% Efficiency.PDF
可靠性数据 : R387 Reliability Data .PDF