LTC3706IGN datasheet(1/20 Pages) LINER

Il numero della parte	LTC3706IGN

Spiegazioni elettronici	Secondary-Side Synchronous Forward Controller with PolyPhase Capability

PDF	20 Pages

Scroll/Zoom	100%

Produttore elettronici	LINER [Linear Technology]

Homepage	http://www.linear.com

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LTC3706

1

3706fb

TYPICAL APPLICATION

DESCRIPTION

Secondary-Side Synchronous

Forward Controller with

PolyPhase Capability

The LTC

®3706 is a PolyPhase capable secondary-side

controller for synchronous forward converters. When used

in conjunction with the LTC3705 gate driver and primary-

side controller, the part creates a complete isolated power

supply that combines the power of PolyPhase operation

with the speed of secondary-side control.

The LTC3706 has been designed to simplify the design

of highly efﬁcient, secondary-side forward converters.

Working in concert with the LTC3705, the LTC3706 forms

a robust, self-starting converter that eliminates the need

for the separate bias regulator that is commonly used in

secondary-side control applications. In addition, a pro-

prietary scheme is used to multiplex gate drive signals

and DC bias power across the isolation barrier through a

single, tiny pulse transformer.

The LTC3706 provides remote sensing, accurate power

good and overvoltage monitoring circuits to support preci-

sion, high current applications. A linear regulator controller

with thermal protection is also provided to simplify the

generation of secondary-side bias voltage.

The LTC3706 is available in a 24-lead SSOP package.

36V-72V to 3.3V/20A Isolated Forward Converter

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

PolyPhase is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 6144194, other patents pending.

FEATURES

APPLICATIONS

n Isolated 48V Telecommunication Systems

n Internet Servers and Routers

n Distributed Power Step-Down Converters

n Automotive and Heavy Equipment

n Secondary-Side Control for Fast Transient Response

n Self-Starting Architecture Eliminates Need for

Separate Bias Regulator

n Proprietary Gate Drive Encoding Scheme Reduces

System Complexity

n PolyPhase

® Operation Reduces CIN Requirements

n Current Mode Control Ensures Current Sharing

n PLL Fixed Frequency: 100kHz to 500kHz

n

±1% Output Voltage Accuracy

n True Remote Sense Differential Ampliﬁer

n Power Good Output Voltage Monitor

n High Voltage Linear Regulator Controller

n Wide Supply Range: 5V to 30V

n Available in a Narrow 24-Lead SSOP Package

NDRV

GND

PGND VSLMT

UVLO

BOOST

LTC3705

BAS21

FQT7N10

0.22μF

10μF

25V

CMPSH1-4

1.2Ω

L1

1.2μH

TG

TS BG IS

T2

1μF

162k

L1: COILCRAFT SER2010-122

T1: PULSE PA0807

T2: PULSE PA0297

33nF

30mΩ

1W

2mΩ

2W

Si7336ADP

2

T1

•

MURS120

Si7852DP

MURS120

VCC

33nF

15k

1%

365k

1%

100k

2.2μF

25V

SS/FLT

FB/IN+

FS/IN–

VIN

–

VIN

+

330μF

6.3V

3

2.2μF

16V

680pF

CZT3019

22.6k

1%

20k

102k

1%

VOUT

–

3706 TA01

VOUT

+

•

1μF

100V

3

FG

SW SG

VIN

NDRV

VCC

GND PGND PHASE SLP MODE REGSD

PT+

IS

+

IS

–

PT–

RUN/SS

LTC3706

ITH

FB

FS/SYNC

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