LTC3705 2-Switch Forward Controller and Gate Driver

The LTC®3705 is a controller for a 2-switch forward converter and includes on-chip bottom and top gate drivers that do not require external transformers. For secondary-side control, combine the LTC3705 with the LTC3706 PolyPhase® secondary-side synchronous forward controller to create a complete forward converter using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals across the isolation barrier through a tiny pulse transformer. The on-chip rectifier and the same pulse transformer provide gate drive bias power.

Alternatively, the LTC3705 can be used as a standalone voltage mode controller in a primary-side control architecture with optoisolator feedback. Voltage feedforward provides excellent line regulation and transient response

产品特点 Features

High-Speed Top and Bottom Gate Drivers for
2-Switch Forward Converter
On-Chip Rectifier and Self-Starting Architecture
Eliminate Need for Separate Gate Drive Bias Supply
Wide Input Voltage Supply Range: 18V to 80V
Tolerant of 100V Input Voltage Transients
linear Regulator Controller for Fast Start-Up
Precision UVLO with Adjustable Hysteresis
Overcurrent Protection
Volt-Second Limit Prevents Transformer Core Saturation
Voltage Feedforward for Fast Transient Response
Available in 16-Lead Narrow SSOP Package

应用

Isolated 48V Telecommunication Systems
Internet Servers and Routers
Distributed Power Step-Down Converters
Automotive and Heavy Equipment

典型应用图

参数

LTC3705 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) *
LTC3705EGN	SSOP	16	E	$3.76	$2.63
LTC3705EGN#PBF	SSOP	16	E	$3.76	$2.63
LTC3705EGN#TR	SSOP	16	E		$2.69
LTC3705EGN#TRPBF	SSOP	16	E		$2.69
LTC3705IGN	SSOP	16	I	$4.03	$2.89
LTC3705IGN#PBF	SSOP	16	I	$4.03	$2.89
LTC3705IGN#TR	SSOP	16	I		$2.95
LTC3705IGN#TRPBF	SSOP	16	I		$2.95

LTC3705 数据手册及相关资料下载

数据手册(英文) : LTC3705 - 2-Switch Forward Controller and Gate Driver.PDF
可靠性数据 : R419 Reliability Data .PDF