LTC3705

20

3705fb

PART NUMBER

DESCRIPTION

COMMENTS

LTC1693

LTC1698

Secondary Synchronous Rectifier Controller

Use with the LT1681, Optocoupler Driver, Pulse Transformer Synchronization

LT1950

Single Switch Controller

Used for 20W to 500W Forward Converters

LTC3706

Polyphase Secondary-Side Synchronous

Fast Transient Response, Self-Starting Architecture, Current Mode Control

Forward Controller

LT3710

Secondary-Side Synchronous Post Regulator

For Regulated Auxiliary Output in Isolated DC/DC Converters

LT3781

“Bootstrap” Start Dual Transistor Synchronous

72V Operation, Synchronous Switch Output

Forward Controller

LT3804

Secondary Side Dual Output Controller

Regulates Two Secondary Outputs, Optocoupler Feedback Driver

with Opto Driver

and Second Output Synchronous Driver Controller

LTC3901

Secondary-Side Synchronous Driver for

Similar Function to LTC3900, Used in Full-Bridge and Push-Pull Converter

Push-Pull and Full-Bridge Converter

LTC4440/LTC4440-5 High Speed, High Voltage and High Side

High Side Source Up to 100V, Up to 15V Gate Drive Supply, 6-Lead

Gate Drivers

ThinSOT

LTC4441

6A MOSFET Driver

ThinSOT is a trademark of Linear Technology Corporation.

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

©LINEAR TECHNOLOGY CORPORATION 2005

LT 1006 REV B • PRINTED IN USA

RELATED PARTS

Figure 8. 36V-72V to 12V/5A Open-Loop Regulated Isolated Forward Converter Using VSLMT

15V

1mH

DO1608C-105

L1

25

µH

BAS21

MURS120

T1

PA0520

NDRV

GND

LTC3705

UVLO

SSFLT

6

1

3

2

7

8

4

5

11

16

14

15

10

9

13

12

TS

BOOT

BG

TG

PGND

NC

NC

P2

–

P1

+

36V TO

72V

P3

–

P4

+

12V

5A

L2

0.82

µH

1

µF

100V

1

µF

100V

220pF

0.033

µF

1000pF

0.22

µF

330pF

301k

100

Ω

100k

365k

1%

0.025

Ω

1W

15k

1%

301k

10

Ω

10

Ω

Q1

0.1

µF

2.2

µF

25V

FQT7N10

C7: TPSE686M025R0125 AVX

D1A, D1B: MBRB20100CT

D3: P6SMB15AT3

L1: GOWANDA 050KM2502SM

L2: VISHAY IHLP2525CZERR82M01

Q1, Q2: SILICONIX Si7456DP

+

1

µF

100V

2.2nF

250V

Q2

MURS120

BAS21

BAS21

D1B

D3

D1A

330pF

200V

20

Ω

1W

C7

68

µF

2x

•

1

6

•

•

27

511

8T

5T

6T

11

7

+

3705 F08

MMBT2907A

MMBT2907A

0.1

µF

LOAD (A)

0

8

6

4

2

14

12

10

16

18

4

3

3705 F08b

12

5

0

Regulation

TYPICAL APPLICATIO