Datasheet > LTC3723-2

LTC3723-2

更新时间： 2024-02-27 10:29:41

品牌	Logo	应用领域
凌特 - Linear		驱动器
页数	文件大小	规格书
20页	268K
描述
Synchronous Rectifier Driver for Forward Converters

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中文翻译

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数据手册

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LTC3723-2 数据手册

LTC3900

Synchronous Rectiﬁer Driver

for Forward Converters

FeaTures

DescripTion

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

ﬁer driver designed to be used in isolated forward con-

verter 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 Protection

Reverse Inductor Current Protection

Pulse Transformer Synchronization

Wide V Supply Range: 4.5V to 11V

15ns Rise/Fall Times at V = 5V, C = 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

sensestheoutputinductorcurrentthroughthedrain-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 too low.

Undervoltage Lockout

Small SO-8 Package

applicaTions

48V Input Isolated DC/DC Converters

Isolated Telecom Power Supplies

High Voltage Distributed Power

Step-Down Converters

Industrial Control System Power Supplies

Automotive and Heavy Equipment

L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

Typical applicaTion

ISOLATION

BARRIER

3.3V

40A

OUT

36V TO 72V

OUT

Efﬁciency

GATE

OUT

= 3.3V

OUT

REG

CS2

CS1

= 36V

= 72V

470Ω

= 48V

SENSE

–

TMR

CS3

LTC3900

10mΩ

LT1952

TIMER

VCC

TMR

OUT

SYNC

GND

COMP

GND

SYNC

270Ω

25 30

LOAD CURRENT (A)

10 15 20

35 40

OPTO

3900 F10b

LT4430

COMP

GND

OCI

3900 F01

Figure 1. Simpliﬁed Isolated Synchronous Forward Converter

3900fb

12 3 4 5 6 7...20

中文翻译

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