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=

ADM1014

One

Technology

Way,

P.O.

Box

9106,

Norwood,

MA

02062-9106,

U.S.A.

Tel:

781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2002

REV.

PrN 1/02

Preliminary Technical

Data

FUNCTIONAL BLOCK DIAGRAM

AUXINA

VOCSET

100µA

OCSET

COMMON TO BOTH CHANNELS

3.3VAUX

POWER-ON

RESET

LOW WHEN

AUXINA < 2.5V

AUXINA

12VGA

12VIN

A

5VISENA

5VSA

3VISENA

3VSA

3V5VGA

+5V

IN

+3.3V

IN

RSENSE3A

RSENSE5A

+5V

OUTA

+3.3V

OUTA

12VOA

-12VGA

-12VINA

5V

REGULATOR

LOW WHEN

12VINA <

10V

35

34

37

36

33

-12VOA

12VIN

A

12V IN

POWER-ON

RESET

GND

AUXGA

AUXINA

AUXOA

FLTNA

FAUXA

5

PWRONA

PAUXONA

12VIN

A

CIRCUIT OPERATES FROM 3.3VAUX POWER SUPPLY

CIRCUIT OPERATES FROM 3.3VAUX AND +12V POWER SUPPLY

P-CHANNEL

MOSFET

D

S

G

FAULT

LATCH

Q

Q

RESET

SET

OVERCURRENT AND

UNDERVOLTAGE

COMPARATORS

FOR +5V

OVERCURRENT AND

UNDERVOLTAGE

COMPARATORS

FOR +3.3V

P-CHANNEL

MOSFET

D

S

G

OVERCURRENT AND

UNDERVOLTAGE

COMPARATORS

FOR +12V

N-CHANNEL

MOSFET

D

S

G

OVERCURRENT

COMPARATOR

FOR -12V

FAULT

LATCH

Q

Q

RESET

SET

COMBINING

LOGIC

COMMON TO BOTH CHANNELS

CHANNEL A

CHANNEL B

( IDENTICAL TO CHANNEL A )

3

4

32

FLTNB

PWRONB

PAUXONB 27

15

17

16

7

8

31

29

9

10

2

1

38

12VGB

12VINB

12VOB

-12VGB

-12VINB

5VISENB

23

5VSB

24

21

3VISENB

3VSB

22

-12VOB

3V5VGB

25

AUXGB

AUXINB

AUXOB

28

11

14

13

26

12

18

19

20

EXTERNAL

N-CHANNEL

POWER

MOSFETS

EXTERNAL

N-CHANNEL

POWER

MOSFETS

3.3V Cmos

Input

3.3V Cmos

Output

30

30

OVERCURRENT AND

UNDERVOLTAGE

COMPARATORS

FOR +3.3VAUX

+5V

IN

+3.3V

IN

RSENSE3B

RSENSE5B

+5V

OUTA

+3.3V

OUTA

CHANNEL A

6

+3.3VAux

+3.3VAux

FAUXB