16

LT1640AL/LT1640AH

©LINEAR TECHNOLOGY CORPORATION 2001

1640alahf LT/TP 0501 4K • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

Using an EMI Filter Module

Many applications place an EMI filter module in the power

path to prevent switching noise of the module from being

injected back onto the power supply. A typical application

using the Lucent FLTR100V10 filter module is shown in

Figure 14. When using a filter, an optoisolator is required

to prevent common mode transients from destroying the

PWRGD and ON/OFF pins.

PART NUMBER

DESCRIPTION

COMMENTS

LTC

Dual Channel, Hot Swap Controller

Operates from 3V to 12V

LTC1422

Hot Swap Controller in SO-8

System Reset Output with Programmable Delay, 3V to 12V

LT1641

Positive 48V Hot Swap Controller in SO-8

Foldback Analog Current Limit

LTC1642

Fault Protected Hot Swap Controller

Operates Up to 16.5V, Protected to 33V

LTC1643

PCI Hot Swap Controller

3.3V, 5V, 12V, – 12V Supplies for PCI Bus

LTC1645

Dual Hot Swap Controller

Operates from 1.2V to 12V, Power Sequencing

LTC1646

CompactPCI

3.3V, 5V Supplies, 1V Precharge, Local PCI Reset Logic

LTC1647

Dual Hot Swap Controller

Dual ON Pins for Supplies from 3V to 15V

CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group

RELATED PARTS

+

LT1640AL

PWRGD

SENSE

C1

150nF

25V

C2

3.3nF

100V

C3

0.1

µF

100V

C4

0.1

µF

100V

C6

0.1

µF

100V

C5

100

µF

100V

C7

100

µF

16V

Q1

IRF530

R2

10

Ω

5%

R3

18k

5%

R7

51k

5%

R4

562k

1%

R5

9.09k

1%

R6

10k

1%

R1

0.02

Ω

5%

4

OV

GND

GND

3

2

– 48V

UV

5

6

8

7

1

GATE

DRAIN

LUCENT

JW050A1-E

+

TRIM

–

+

9

5V

1640A F14

8

7

6

5

3

1

2

4

ON/OFF

CASE

–

+

–

+

CASE

–

+

LUCENT

FLTR100V10

(SHORT PIN)

*

* DIODES INC. SMAT70A

4

3

2

1

4N25

Figure 14. Typical Application Using a Filter Module