KA2803B

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This literature is subject to all applicable copyright laws and is not for resale in any manner. KA2803B Earth Leakage Detector Features Description         Low Power Consumption: 5 mW, 100 V/200 V  Wide Operating Temperature Range: TA = -25°C to +80°C  Operation from 12 V to 20 V Input Built-In Voltage Regulator High-Gain Differential Amplifier 0.4 mA Output Current Pulse to Trigger SCRs Low External Part Count DIP & SOP Packages, High Packing Density High Noise Immunity, Large Surge Margin 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. Super Temperature Characteristic of Input Sensitivity 8-DIP Functions  Differential Amplifier  Level Comparator  Latch Circuit 8-SOP Ordering Information Part Number Operating Temperature Range KA2803B -25 to +80°C © 2000 Fairchild Semiconductor Corporation KA2803B • Rev. 1.0.8 Package 8-Lead, Dual Inline Package (DIP) Packing Method Tube www.fairchildsemi.com KA2803B — Earth Leakage Detector January 2014 KA2803B — Earth Leakage Detector Block Diagram Figure 1. Block Diagram Application Circuit Figure 3. Half-Wave Application Circuit Figure 2. Full-Wave Application Circuit Application Information used to protect the earth leakage detector IC (KA2803B). The range of RP is from several hundred Ω to several kΩ. (Refer to full-wave application circuit in Figure 2) Figure 2 shows the KA2803B connected in a typical leakage current detector system. The power is applied to the VCC terminal (Pin 8) directly from the power line. The resistor RS and capacitor CS are chosen so that Pin 8 voltage is at least 12 V. The value of CS is recommended above 1 µF. Capacitor C1 is for the noise canceller and a standard value of C1 is 0.047 µF. Capacitor C2 is also a noise canceller capacitance, but it is not usually used. When high noise is present, a 0.047 µF capacitor may be connected between Pins 6 and 7. The amplified signal finally appears at the Pin 7 with pulse signal through the internal latch circuit of the KA2803B. This signal drives the gate of the external SCR, which energizes the trip coil, which opens the circuit breaker. The trip time of the breaker is determined by capacitor C3 and the mechanism breaker. This capacitor should be selected under 1µF to satisfy the required trip time. The full-wave bridge supplies power to the KA2803B during both the positive and negative half cycles of the line voltage. This allows the hot and neutral lines to be interchanged. If the leakage current is at the load, it is detected by the zero current transformer (ZCT). The output voltage signal of ZCT is amplified by the differential amplifier of the KA2803B internal circuit and appears as a half-cycle sine wave signal referred to input signal at the output of the amplifier. The amplifier closed-loop gain is fixed about 1000 times with internal feedback resistor to compensate for zero current transformer (ZCT) variations. The resistor RL should be selected so that the breaker satisfies the required sensing current. The protection resistor RP is not usually used when high current is injected at the breaker; this resistor should be © 2000 Fairchild Semiconductor Corporation KA2803B • Rev. 1.0.8 www.fairchildsemi.com 2 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Min. Max. Unit VCC Supply Voltage 20 V ICC Supply Current 8 mA PD Power Dissipation 300 mW TL Lead Temperature, Soldering 10 Seconds 260 °C TA Operation Temperature Range -25 +80 °C Storage Temperature Range -65 +150 °C TSTG KA2803B — Earth Leakage Detector Absolute Maximum Ratings Electrical Characteristics TA = -25°C to +80°C unless otherwise specified. Symbol ICC VT Parameter Supply Current 1 Trip Voltage Conditions Test Circuit Min. Typ. Max. Figure 4 300 400 530 TA= -25°C VCC=12V VR=OPEN VI=2 V TA= +25°C 580 TA= +80°C VCC=16 V, VR=2 V~2.02 V, VI=2 IO VSCON µA 480 Figure 5 Note 1 IO(D) Units 14 16 18 12.5 14.2 17.0 mV (ms) Differential Amplifier Current Current 1 VCC=16 V, VR~VI=30 mV, VOD=1.2 V Figure 7 -12 20 -30 Differential Amplifier Current Current 2 VCC=16 V, VOD=0.8 V,VR, VI Short=VP Figure 8 17 27 37 VSC=1.4 V, TA= -25°C VOS=0.8 V, TA= +25°C VCC=16.0 V TA= +80°C 200 400 800 Output Current Figure 9 200 400 800 100 300 600 VCC=16 V Figure 10 0.7 1.0 1.4 V Latch-On Voltage µA µA ISCON Latch Input Current VCC=16 V Figure 11 -13 -7 -1 µA IOSL Output Low Current VCC=12 V, VOSL=0.2 V Figure 12 200 800 1400 µA VIDC Differential Input Clamp Voltage VCC=16 V, IIDC=100 mA Figure 13 0.4 1.2 2.0 V VSM Maximum Current Voltage ISM=7 mA Figure 14 20 24 28 V IS2 Supply Current 2 VCC=12.0 V, VOSL=0.6 V Figure 15 200 400 900 µA Figure 16 7 8 9 V Figure 17 2 3 4 ms VOS=12.0 V VSOFF Latch-Off Supply Voltage VSC=1.8 V IIDC=100.0 mA tON Response Time VCC=16 V, VR-VI=0.3 V, 1 V