LTC3901 Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters

The LTC®3901 is a secondary side synchronous rectifier driver designed to be used in isolated push-pull and fullbridge converter power supplies. The chip drives two external N-channel MOSFETs and accepts a transformergenerated bipolar input to maintain sychronization with the primary side controller.

The LTC3901 provides a full range of protection features for the external MOSFETs. A programmable timeout function is included that disables both drivers when the synchronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drain-source resistance of the two MOSFETs, turning off the MOSFETs if the inductor current reverses. The LTC3901 also shuts off the drivers if the supply is low or if the synchronization sequence is incorrect

产品特点 Features

N-Channel Synchronous MOSFET Driver
Programmable Timeout
Reverse Inductor Current Sense
Gate Drive Transformer Synchronization Sequence Monitor
Wide VCC Supply Range: 4.5V to 11V
15ns Rise/Fall Times at VCC = 5V, CL = 4700pF
Undervoltage Lockout
Small 16-Lead SSOP Package

封装

应用

48V Input Isolated DC/DC Converters
Isolated Telecom Power Supplies
Distributed Power Step-Down Converters
Industrial Control System Power Supplies
Automotive and Heavy Equipment

典型应用图

参数

LTC3901 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) *
LTC3901EGN	SSOP	16	E	$3.75	$2.60
LTC3901EGN#PBF	SSOP	16	E	$3.75	$2.60
LTC3901EGN#TR	SSOP	16	E		$2.66
LTC3901EGN#TRPBF	SSOP	16	E		$2.66

演示电路板

器件型号	描述
DC677A	LT1952-1EGN-1, LTC3901ES Demo Board \| Vin=36V-75V, Vout=3.3V @ 50A

LTC3901 数据手册及相关资料下载

数据手册(英文) : LTC3901 - Synchronous Rectifier Driver for Forward Converters.PDF
可靠性数据 : R368 Reliability Data .PDF
LT Journal : March 2005 - Efficient and Reliable Drive for Synchronous MOSFET Rectifiers.PDF
产品新闻发布 (中文) : 隔离式正向转换器集成电路规定在 -55°C 至 125°C 的节温范围内工作.PDF