KA2803B_11 Datasheet, PDF (1/11 Pages) Fairchild Semiconductor – Earth Leakage Detector

December 2011
KA2803B
Earth Leakage Detector
Features
 Low Power Consumption: 5mW, 100V/200V
 Built-In Voltage Regulator
 High-Gain Differential Amplifier
 0.4mA Output Current Pulse to Trigger SCRs
 Low External Part Count
 DIP & SOP Packages, High Packing Density
 High Noise Immunity, Large Surge Margin
 Super Temperature Characteristic of
Input Sensitivity
 Wide Operating Temperature Range:
T_A = -25C to +80C
 Operation from 12V to 20V Input
Functions
 Differential Amplifier
 Level Comparator
 Latch Circuit
Description
The KA2803B is designed for use in earth leakage
circuit interrupters, for operation directly off the AC line
in breakers. The input of the differential amplifier is
connected to the secondary coil of ZCT (Zero Current
Transformer). The amplified output of differential
amplifier is integrated at external capacitor to gain
adequate time delay specified in KSC4613. The level
comparator generates a high level when earth leakage
current is greater than the fixed level.
8-DIP
8-SOP
Ordering Information
Part Number Operating Temperature Range
Package
KA2803B
-25 to +80°C
8-Lead, Dual Inline Package (DIP)
KA2803BD
-25 to +80°C
8-Lead, Small Outline Package (SOP)
Packing Method
Tube
Tape and Reel
© 2000 Fairchild Semiconductor Corporation
KA2803B • Rev. 1.0.7
www.fairchildsemi.com