KA2803B

www.fairchildsemi.com KA2803B Earth Leakage Detector Features Low Power Consumption PD =5mW, 100V/200V Built-in Voltage Regulator High Gain Differential Amplifier 0.4mA Output Current Pulse to Trigger SCR' S Low External Part Count DIP Package (8-DIP), High Packing Density High Noise Immunity, Large Surge Margin Super Temperature Characteristic of Input Sensitivity Wide Operating Temperature Range (TA = -25°C ~ +80°C) Operation from 12 to 20V Input Description The KA2803B is designed for use in earth leakage circuit interrupters, for stable operation of 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 that is specified in KSC4613. The level comparator generates high level when earth leakage current is greater than the fixed level. 8-DIP Functions Differential Amplifier Level Comparator Latch Circuit 1 8-SOP 1 Block Diagram 8 VCC 7 OS(Output) 6 NR 5 SC Bias Voltage Internal Internal Bias Zener Zener Protect Reference Voltage Generator Reference + Latch Latch Circuit + - Circuit Voltage 1 VR 2 VI 3 GND 4 OD Rev. 1.0.4 ©2002 Fairchild Semiconductor Corporation KA2803B Absolute Maximum Ratings (TA = 25°C) Parameter Supply Voltage Supply Current Power Dissipation Lead Temperature (Soldering 10sec) Operating Temperature Storage Temp...