LTC1531_15 Datasheet, PDF (16/16 Pages) Linear Technology – Self-Powered Isolated Comparator

LTC1531
TYPICAL APPLICATION
ISOLATION
BARRIER
V_CC
V_CC
ZCDATA
SHDN
ZCPOS ZCNEG
V_TRIP
DATA
QD
VALID
GND
LTC1531
NEGATIVE COMPARATOR
INPUT SET TO 1.25V
R_SENSE IN SERIES WITH AC LINE
R_SENSE TRIP VOLTAGE = 125mV
2 ^{= LIVE AC-CONNECTED}
LOCAL CIRCUIT COMMON
= EQUIPMENT GROUND
V_PW
2.5V ^VREG
V1
V2
+
V3
–
V4
CMPOUT
ISOGND
2
DANGER!
LETHAL VOLTAGES
IN THIS SECTION!
+
2.2μF
2
1M
51k
1N4148
LT1496
LT1496
10k
1M
1M
0.22μF
2
2
V_PW
2
1M
1M
51k
LT1496
UNUSED OP AMP
TIED FOR MIN
CURRENT DRAIN
LT1496
10k
2
Figure 15. AC Line Overcurrent Detect
AC
R_SENSE
2
AC
1531 F15
RELATED PARTS
PART NUMBER DESCRIPTION
LTC1177
Isolated MOSFET Driver
LT1389
Nanopower Reference
LTC1440/LTC1441 Ultralow Power Single/Dual Comparators with Reference
LTC1442
LT1495/LT1496 1.5μA Max, Dual/Quad Precision Rail-to-Rail Input and Output Op Amps
LTC1540
Nanopower Comparator with Reference
COMMENTS
No Secondary Power Supply, 2500V_RMS Isolation
800nA, 0.05% Accuracy, 10ppm/°C Max Drift
2.1μA Typ, 2V to 11V Supply, Adjustable Hysteresis
Low Offset 375μV_MAX, 2.2V to 36V Supply
0.3μA Typ, Adjustable Hysteresis, 2V to 11V Supply
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX:[phone] ^● www.linear-tech.com
1531f LT 0607 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1998