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FEATURES

s

LT1681

Dual Transistor

Synchronous Forward Controller

DESCRIPTIO

The LT

廬

1681 controller simplifies the design of high power

synchronous dual transistor forward DC/DC converters. The

part employs fixed frequency current mode control and

supports both isolated and nonisolated topologies. The IC

drives external N-channel power MOSFETs and operates with

input voltages up to 72V.

The LT1681鈥檚 operating frequency is programmable and can

be synchronized up to 350kHz. Switch phase is also con-

trolled during synchronized operation to accommodate mul-

tiple converter systems. Internal logic guarantees 50% maxi-

mum duty cycle operation to prevent transformer saturation.

The LT1681 incorporates a soft-start feature that provides a

controlled increase in supplied current during start-up and

after an undervoltage lockout or overvoltage/overcurrent

event.

The part is available in a 20-lead wide SO package to support

high voltage pin-to-pin clearance.

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

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High Voltage: Operation Up to 72V

Synchronizable Operating Frequency and Output

Switch Phase for Multiple Controller Systems

Fixed Frequency Operation to 350kHz

Adaptive and Adjustable Blanking

Synchronous Rectifier Driver

Local 1% Voltage Reference

Undervoltage Lockout Protection with Hysteresis

Input Overvoltage Protection

Programmable Start Inhibit

Transformer Primary Saturation Protection

Optocoupler Feedback Support

Soft-Start Control

APPLICATIO S

s

Isolated Telecommunication Systems

Personal Computers and Peripherals

Lead Acid Battery Backup Systems

Automotive and Heavy Equipment

TYPICAL APPLICATIO

L1

4.7碌H

V

IN+

36V-72V DC to 5V/7A Synchronous Forward Converter (Half-Brick Footprint)

L2

4.1碌H

6

Q1

MURS120T3

C2

22碌F

100V

C3

1.5碌F

100V

V

IN鈥?/div>

C2:SANYO 100MV22AX

C3, C4: VITRAMON VJ1825Y155MXB

C5: 4X KEMET T510X337KO10AS

L1: COILCRAFT DO1608C-472

L2: PANASONIC ETQP6F4R1LF4

Q1,Q3:100V SILICONIX SUD40N10-25

Q5,Q6: SILICONIX Si4450

T1:COILTRONICS VP5-1200

Q10: ON SEMI MMBT3906LTI

73.2k

1%

270k

0.25W

20k

CMPZ-

5248B

15V

C4

1.5碌F

100V

MURS120T3

7

5

8

4

0.025鈩?/div>

1/2W

9

T1 Q5

鈥?/div>

+

鈥?/div>

Q3

鈥?/div>

ZVN3310F

BAT54

1OV

BIAS

MMBD914LT1

0.1碌F

100V

10k

330pF

5V

OUT

3.3鈩?/div>

0.047碌F

8

1OV

BIAS

BAS21

14

20

17

19

18

16

11

12

15

V

CC

V

BST

BLKSENS TG BSTREF BG SENSE T

MAX

PGND 13

SG

2

LT1681

OVLO

9

1

THERM SYNC SGND SS V

C

V

FB

SHDN 5V

REF

F

SET

6

5

52.3k

1碌F

150pF

3

7

4

8

10

100鈩?/div>

4.7nF

0.01碌F

CMPZ5248B

18V

0.1碌F

10k

1nF 24k

56k

1.24k

1%

3.01k

1%

1k

1%

51鈩?/div>

+

68碌F

20V

Q10

LTC1693-2

6

V

CC1

V

CC2

5

3

IN2

OUT2

7

1

IN1

OUT1

2

4

GND2

GND1

U

V

OUT

= 5V

I

OUT

= 7A

V

OUT+

1

2

3

10鈩?/div>

0.25W

1nF

100V

10

1nF

11

100V

10鈩?/div>

0.25W

12

MBR-

0540T1

Q6

+

C5

330碌F

10V

4.7鈩?/div>

V

OUT鈥?/div>

100鈩?/div>

FZT690

4.7碌F

16V

CMPZ5242B

12V

2k

0.22碌F

50V

1681 TA01

1681f

1

數據列表
LT1681
標準包裝
38
類別
集成電路 (IC)
家庭
PMIC - 電源控制器，監(jiān)視器
系列
-
應用
同步正向控制器
輸入電壓
72V
電源電壓
9 V ~ 18 V
電流 - 電源
17mA
工作溫度
-40°C ~ 85°C
安裝類型
表面貼裝
封裝/外殼
20-SOIC（0.295"，7.50mm 寬）
供應商設備封裝
20-SOIC
包裝
管件

LT1681ISW相關型號PDF文件下載

型號

版本

描述

廠商

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LINER

LT1616
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1.4MHz, 600mA Step-Down Switching Regulator in SOT-23

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LT1616
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Micropower Inverting DC/DC Converters in SOT-23

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LINER

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英文版

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Linear

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英文版

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LINER

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LT1681ISW Datasheet

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