Datasheet > LT1640AL

LT1640AL

更新时间： 2022-12-12 15:45:48

品牌	Logo	应用领域
凌特 - Linear		控制器
页数	文件大小	规格书
12页	231K
描述
Negative 48V Hot Swap Controller

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数据手册

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LT1640AL 数据手册

LT4250L/LT4250H

Negative 48V

Hot Swap Controller

FEATURES

DESCRIPTIO

TheLT^®4250L/LT4250Hare8-pin,negative48VHotSwap^TM

controllers that allow a board to be safely inserted and

removedfromalivebackplane. Inrushcurrentislimitedto

aprogrammablevaluebycontrollingthegatevoltageofan

external N-channel pass transistor. The pass transistor is

turned off if the input voltage is less than the program-

mable undervoltage threshold or greater than the over-

voltage threshold. A programmable current limit protects

the system against shorts. After a 500µs timeout the

current limit activates the electronic circuit breaker. The

PWRGD (LT4250L) or PWRGD (LT4250H) signal can be

used to directly enable a power module. The LT4250L is

designed for modules with a low enable input and the

LT4250H for modules with a high enable input.

■

Allows Safe Board Insertion and Removal

from a Live –48V Backplane

■

Circuit Breaker Immunity to Voltage Steps and

Current Spikes

■

Programmable Inrush and

Short-Circuit Current Limits

■

Pin Compatible with LT1640L/LT1640H

■

Operates from –20V to –80V

■

Programmable Overvoltage Protection

■

Programmable Undervoltage Lockout

■

Power Good Control Output

■

^{Bell-Core Compa}U^{tible ON/OFF Threshold}

APPLICATIO S

■

The LT4250L/LT4250H are available in 8-pin PDIP and SO

packages.

Central Office Switching

■

–48V Distributed Power Systems

■

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

Negative Power Supply Control

Hot Swap is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

–48V RTN

(SHORT PIN)

–48V RTN

R4^†

Voltage Step On Input Supply

549k

UV =

R5^†

6.49k

38.5V

LT4250L

PWRGD

RELEASE

AT 43V

R6^†

10k

OV =

71V

SENSE

GATE

DRAIN

AND

DRAIN

20V/DIV

R3^†

1k, 5%

0.1µF

10V

C1^†

470nF

25V

10Ω

C2^†

15nF

100V

–48V

INPUT 1

R1^†

0.02Ω

(Q1)

5A/DIV

IRF530

ON/OFF

–

–48V

500µs/DIV

OUT

SENSE

INPUT 2

0.1µF

100V

* DIODES INC. SMAT70A

100µF

TRIM

100µF

16V

^†THESE COMPONENTS ARE APPLICATION

SPECIFIC AND MUST BE SELECTED BASED

UPON OPERATING CONDITIONS AND DESIRED

PERFORMANCE. SEE APPLICATIONS

INFORMATION.

100V

–

SENSE

–

OUT

4250 TA01

LUCENT

JW050A1-E

4250lhf

12 3 4 5 6 7...12

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