Datasheet > LTC3900

LTC3900

更新时间： 2022-12-13 11:24:34

品牌	Logo	应用领域
凌特 - Linear		驱动器
页数	文件大小	规格书
12页	200K
描述
Synchronous Rectifier Driver for Forward Converters

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LTC3900 数据手册

Final Electrical Specifications

LTC3900

Synchronous Rectifier

Driver for Forward Converters

November 2003

DESCRIPTIO

FEATURES

The LTC^®3900 is a secondary-side synchronous rectifier

driver designed to be used in isolated forward converter

power supplies. The chip drives N-channel rectifier

MOSFETs and accepts pulse sychronization from the

primary-side controller via a pulse transformer.

■

N-Channel Synchronous Rectifier MOSFET Driver

■

Programmable Timeout

■

Reverse Inductor Current Sense

■

Pulse Transformer Synchronization

■

Wide V_CCsupply range: 4.5V to 11V

■

15ns Rise/Fall Times at V_CC= 5V, C_L= 4700pF

TheLTC3900incorporatesafullrangeofprotectionforthe

external MOSFETs. A programmable timeout function is

included that disables both drivers when the synchroniza-

tion signal is missing or incorrect. Additionally, the chip

senses the output inductor current through the drain-

source resistance of the catch MOSFET, shutting off the

MOSFET if the inductor current reverses. The LTC3900

also shuts off the drivers if the supply voltage is low.

■

Undervoltage Lockout

■

^{Small SO-8 Pack}U^age

APPLICATIO S

■

48V Input Isolated DC/DC Converters

■

Isolated Telecom Power Supplies

■

Distributed Power Step-Down Converters

■

Industrial Control System Power Supplies

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

Automotive and Heavy Equipment

TYPICAL APPLICATIO

ISOLATION

BARRIER

OUT

3.3V

36V TO 72V

OUT

REG

CS2

CS1

LTC1693-2

–

TMR

LTC3900

CS3

TIMER

VCC

TMR

SYNC

LTC1693-2

GND

GATE

SYNC

LT1950

FORWARD CONTROLLER

270Ω

GND COMP

–

LT1797

3900 F01

OC1

Figure 1. Simplified Isolated Forward Converter

3900i

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

12 3 4 5 6 7...12

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与LTC3900相关器件

型号	品牌	获取价格	描述	数据表
LTC3900_1	Linear	获取价格	Synchronous Rectifier Driver for Forward Converters
LTC3900ES8	Linear	获取价格	Synchronous Rectifier Driver for Forward Converters
LTC3900ES8#PBF	Linear	获取价格	LTC3900 - Synchronous Rectifier Driver for Forward Converters; Package: SO; Pins: 8; Tempe
LTC3900HS8	Linear	获取价格	IC SWITCHING REGULATOR, PDSO8, PLASTIC, SOP-8, Switching Regulator or Controller
LTC3900HS8#PBF	Linear	获取价格	LTC3900 - Synchronous Rectifier Driver for Forward Converters; Package: SO; Pins: 8; Tempe
LTC3900HS8#TR	Linear	获取价格	IC SWITCHING REGULATOR, PDSO8, PLASTIC, SOP-8, Switching Regulator or Controller
LTC3900HS8#TRPBF	Linear	获取价格	LTC3900 - Synchronous Rectifier Driver for Forward Converters; Package: SO; Pins: 8; Tempe
LTC3900IS8#PBF	Linear	获取价格	LTC3900 - Synchronous Rectifier Driver for Forward Converters; Package: SO; Pins: 8; Tempe
LTC3900MPS8	Linear	获取价格	IC SWITCHING REGULATOR, PDSO8, PLASTIC, SOP-8, Switching Regulator or Controller
LTC3900MPS8#TR	Linear	获取价格	IC SWITCHING REGULATOR, PDSO8, PLASTIC, SOP-8, Switching Regulator or Controller

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