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DESCRIPTIO

N-Channel Synchronous MOSFET Driver

Programmable Timeout

Reverse Inductor Current Sense

Gate Drive Transformer Synchronization

Sequence Monitor

Wide V

CC

Supply Range: 4.5V to 11V

15ns Rise/Fall Times at V

CC

= 5V, C

L

= 4700pF

Undervoltage Lockout

Small 16-Lead SSOP Package

The LTC

廬

3901 is a secondary side synchronous rectifier

driver designed to be used in isolated push-pull and full-

bridge converter power supplies. The chip drives two

external N-channel MOSFETs and accepts a transformer-

generated 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 func-

tion is included that disables both drivers when the syn-

chronization 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.

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

All other trademarks are the property of their respective owners.

APPLICATIO S

鈻?/div>

48V Input Isolated DC/DC Converters

Isolated Telecom Power Supplies

Distributed Power Step-Down Converters

Industrial Control System Power Supplies

Automotive and Heavy Equipment

TYPICAL APPLICATIO

L1

ISOLATION

BARRIER

T1

V

IN

36V TO 72V

CSE +

MA

MB

ME

CSE 鈥?/div>

DRVA

DRVB

LTC3723

PUSH-PULL

CONTROLLER

COMP V

FB

SDRA SDRB

GND

V

CC

LTC3901

+

CSF

PV

CC

MF

CSF 鈥?/div>

SYNC

T2

OUT

FB

LT4430 OR LT1431

OPTOCOUPLER

DRIVER

COMP

3901 F01

PGND

TIMER

Figure 1. Simplified Isolated Push-Pull Converter

3901f

U

+

C

OUT

V

OUT

12V

U

1

數據列表
LTC3901
標準包裝
100
類別
集成電路 (IC)
家庭
PMIC - MOSFET，電橋驅動器 - 外部開關
系列
-
配置
高端
輸入類型
反相和非反相
延遲時間
60ns
電流 - 峰
2A
配置數
2
輸出數
2
高端電壓 - 最大（自引導啟動）
-
電源電壓
4.5 V ~ 11 V
工作溫度
-40°C ~ 85°C
安裝類型
表面貼裝
封裝/外殼
16-SSOP（0.154"，3.90mm 寬）
供應商設備封裝
16-SSOP
包裝
管件

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LTC3901EGN Datasheet

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