婷婷午夜福利伊人无码av,亚洲男人的av天堂

Final Electrical Specifications

LT3781

鈥淏ootstrap鈥?Start Dual

Transistor Synchronous Forward Controller

FEATURES

s

DESCRIPTIO

May 2002

s

High Voltage Operation up to 72V

Synchronizable Operating Frequency and Output

Switch Phase for Multiple Controller Systems

Synchronous Switch Output

Undervoltage Lockout Protection with 6V Hysteresis

for Self-Biased Power

Fixed Frequency Operation to 350kHz

Local 1% Voltage Reference

Input Overvoltage Protection

Low Start-Up Current

Programmable Start Inhibit for Power Supply

Sequencing and Protection

Optocoupler Support

Soft-Start Control

Isolated Telecommunication Systems

Personal Computers and Peripherals

Distributed Power Step-Down Converters

Lead Acid Battery Backup Systems

Automotive and Heavy Equipment

The LT

廬

3781 controller simplifies the design of high

power synchronous dual transistor forward DC/DC con-

verters. The part employs fixed frequency current mode

control and supports both isolated and nonisolated to-

pologies. The IC drives external N-channel power MOSFETs

and operates with input voltages up to 72V.

The LT3781 is ideal for output derived power schemes,

through the use of a large undervoltage lockout hysteresis

range. The part is also equipped with an 18V power supply

pin regulator which prevents exceeding absolute maxi-

mum ratings while in trickle start applications.

The LT3781鈥檚 operating frequency is programmable and

can be synchronized up to 350kHz. Switch phase is also

controlled during synchronized operation to accommo-

date multiple-converter systems. Internal logic guaran-

tees 50% maximum duty cycle operation to prevent trans-

former saturation.

The LT3781 is available in a 20-lead SSOP package.

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

APPLICATIO S

s

TYPICAL APPLICATIO

V

IN+

L1

4.7碌H

36V-72V to 5V/7A DC/DC

Synchronous Forward Converter (Quarter-Brick Footprint)

T1

6

Q1

MURS120T3

7

5

MURS120T3

R9

0.025鈩?/div>

1/2W

8

4

9

Q5

ZVN3310F

鈥?/div>

+

C2

22碌F

100V

C3

1.5碌F

100V

C4

1.5碌F

100V

鈥?/div>

1

2

3

Q3

10

11

12

1nF

100V

鈥?/div>

V

IN鈥?/div>

BAT54

1OV

BIAS

MMBD914LT1

270k

0.25W

73.2k

1%

20k

13

2

1

0.1碌F

68碌F

20V

1nF

1.24k

1%

10k

1碌F

BAS21

20

V

CC

V

BST

OVLO

SHDN 5V

REF

FSET

19

18

LT3781

15

11

14

TG BSTREF BG SENSE

0.1碌F

100V

10k

330pF

5V

OUT

3.3鈩?/div>

0.047碌F

LTC1693-2 6

V

CC1

V

CC2

5

3

IN2

OUT2

7

1

IN1

OUT1

2

4

GND2 GND1

8

1OV

BIAS

FZT690

4.7碌F

16V

PGND 12

SG

9

THERM SYNC SGND SS V

C

V

FB

3

7

4

8

10

5

6

52.3k

150pF

+

100鈩?/div>

4.7nF

0.01碌F

3.01k

1%

1k

1%

51鈩?/div>

C2:SANYO 100MV22AX

C3, C4: VITRAMON VJ1825Y155MXB

C5: 4X KEMET T510X337KO10AS

L1: COILCRAFT DO1608C-472

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-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

U

L2

4.1碌H

10鈩?/div>

0.25W

1nF

100V

10鈩?/div>

0.25W

MBR-

0540T1

Q6

4.7鈩?/div>

100鈩?/div>

CMPZ5242B

12V

2k

0.22碌F

50V

U

V

OUT

= 5V

I

OUT

= 7A

V

OUT+

+

C5

330碌F

10V

V

OUT鈥?/div>

L2: PANASONIC ETQP6F4R1LF4

Q1,Q3:100V SILICONIX SUD40N10-25

Q5,Q6: SILICONIX Si4450

T1:COILTRONICS VP5-1200

3781i

1

型號

版本

描述

廠商

下載
LT370

英文版

GREEN LAMP LED

SEOUL

LT370
LT370

英文版

Acriche

LT370
LT371

英文版

Seoul Semiconductor [INFRARED LAMP LED]

SEOUL

LT371
LT3710

英文版

Secondary Side Synchronous Post Regulator

LINER

LT3710
LT3710

英文版

Secondary Side Synchronous Post Regulator

LINER [Lin...

LT3710
LT3724

英文版

High Voltage, Current Mode Switching Regulator Controller

LINER

LT3724
LT3724

英文版

High Voltage, Current Mode Switching Regulator Controller

LINER [Lin...

LT3724
LT3724

英文版

High Voltage, Current Mode Switching Regulator Controller

LINER [Lin...

LT3724
LT373L

英文版

Optoelectronic

ETC

LT373L
LT3740

英文版

Wide Operating Range, Valley Mode, No RSENSE⑩ Synchronous S...

LINER [Lin...

LT3740
LT3741

英文版

High Power, Constant Current, Constant Voltage, Step-Down Co...

Linear Technolo...

LT3741
LT3742

英文版

Dual, 2-Phase Step-Down Switching Controller

LINER [Lin...

LT3742
LT3748

英文版

100V Isolated Flyback Controller

Linear

LT3748
LT3750

英文版

Capacitor Charger Controller

LINER [Lin...

LT3750
LT3750

英文版

Capacitor Charger Controller

Linear

LT3750
LT3751

英文版

Capacitor Charger Controller with Regulation

LINER [Lin...

LT3751
LT3755

英文版

40VIN, 75VOUT LED Controller

LINER [Lin...

LT3755
LT3756

英文版

100VIN, 100VOUT LED Controller

LINER [Lin...

LT3756
LT3781

英文版

Bootstrap Start Dual Transistor Synchronous Forward Controll...

LINER

LT3781
LT3781

英文版

“Bootstrap” Start Dual Transistor Synchronous Forward Cont...

LINER [Lin...

LT3781

LT3781 Datasheet

PDF預(yù)覽

LT3781相關(guān)型號PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號推薦

LT3781 Datasheet

PDF預(yù)覽

LT3781相關(guān)型號PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號推薦

建議反饋

PDF糾錯X