16

LTC1531

1531f, sn1531 LT/TP 0899 4K • PRINTED IN USA

©LINEAR TECHNOLOGY CORPORATION 1998

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LTC1177

Isolated MOSFET Driver

LT1389

Nanopower Reference

800nA, 0.05% Accuracy, 10ppm/

°C Max Drift

LTC1440/LTC1441

Ultralow Power Single/Dual Comparators with Reference

2.1

µA Typ, 2V to 11V Supply, Adjustable Hysteresis

LTC1442

LT1495/LT1496

1.5

LTC1540

Nanopower Comparator with Reference

0.3

µA Typ, Adjustable Hysteresis, 2V to 11V Supply

Figure 15. AC Line Overcurrent Detect

ISOGND

V1

V2

V3

V4

1531 F15

VALID

GND

ISOLATION

BARRIER

NEGATIVE COMPARATOR

INPUT SET TO 1.25V

51k

1M

1M

2.5V

2.2

µF

0.22

µF

1N4148

LTC1531

+

–

SHDN

CMPOUT

ZCDATA

ZCPOS ZCNEG

DATA

Q

D

+

10k

10k

51k

1M

1M

1M

AC

AC

UNUSED OP AMP

TIED FOR MIN

CURRENT DRAIN

LT1496

LT1496

LT1496

2

2

2

2

2

2

= LIVE AC-CONNECTED

LOCAL CIRCUIT COMMON

= EQUIPMENT GROUND

2

LT1496

2

DANGER!

LETHAL VOLTAGES

IN THIS SECTION!