查询KA2803B供应商 www.fairchildsemi.com KA2803B Earth Leakage Detector Features 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. 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 8-DIP Functions 1 • Differential Amplifier • Level Comparator • Latch Circuit 8-SOP 1 Block Diagram 8 VCC 7 OS(Output) 6 NR 5 SC 4 OD Zener Zener Protect Internal Internal Bias Bias Voltage Reference Voltage Generator Reference Latch Latch Circuit + + - Circuit Voltage 1 VR 2 VI 3 GND Rev. 1.0.4 ©2002 Fairchild Semiconductor Corporation KA2803B Absolute Maximum Ratings (TA = 25°°C) Parameter Symbol Value Unit Supply Voltage VCC 20 V Supply Current ICC 8 mA Power Dissipation PD 300 mW Lead Temperature (Soldering 10sec) TLEAD 260 °C Operating Temperature TOPR - 25 ~ +80 °C Storage Temperature TSTG - 65 ~ +150 °C Electrical Characteristics (TA = -25°C to 80°C) Parameter Supply Current 1 Trip Voltage Symbol ICC VT Conditions VCC = 12V VR = Open VI = 2V Circuit Min. (-25°C) (25°C) 1 (80°C) VCC = 16V VR = 2V ~ 2.02V VI = 2V 2 (Note1) Differential Amplifier Output Current 1 Differential Amplifier Output Current 2 Unit - - 580 300 400 530 - - 480 14 16 18 mV 12.5 14.2 17 mVrms µA IO(D) VCC = 16V (VR-VI =30mV , VOD =1.2V) 3 -12 20 -30 µA IO(D) VCC =16V, VOD =0.8V VR, VI =VP (Note2) 4 17 27 37 (rms) µA 200 400 800 VSC = 1.4V (-25°C) Output Current Typ. Max. IO VOS = 0.8V (25°C) 5 VCC = 16V (25°C) 200 400 800 100 300 600 µA Latch on Voltage VSCON VCC = 16V 6 0.7 1.0 1.4 V Latch Input Current ISCON VCC = 16V 7 -13 -7 -1 µA Output Low Current IOSL VCC = 12V, VOSL = 0.2V 8 200 800 1400 µA Diff. Input Clamp Voltage VIDC VCC = 16V, IIDC = 100mA 9 0.4 1.2 2 V Maximum Current Voltage VSM ISM = 7mA 10 20 24 28 V VCC = 12V, VOSL = 0.6V 11 200 400 900 µA 12 7.0 8.0 9.0 V 13 2 3 4 mS Supply Current 2 IS2 VOS = 12V Latch Off Supply Voltage VSOFF VSC = 1.8V IIDC =100mA Response Time(Note1) TON VCC = 16V VR-VI = 0.3V , 1V < VX < 5V Note: 1. This Parameter, although guaranteed, is not tested in Production. 2. VP=Vpin1 -0.03V at Vpin2=2.0V , Vpin4=1.5V 2 KA2803B Test Circuit VPin1 for VP Measurement PIN1Voltage 22 Trip Voltage 11 Supply Current1 Pin1 Voltage Vr=2V~2.02V Open Open 2V 2V 1 8 8 7 7 6 6 5 1 2 2 3 3 4 4 2 02V 1 1 2 2V 2 2V 3 3 4 Vr=2V 12V 12V Open Open 7 6 6 5 4 473 473 5 16V 16V Open Open 8 8 7 1 8 8 7 1 2 2 3 3 4 2V DVM 2V 473 473 Open Open 5 Vpin1 Vpin1 16V 16V Open Open 7 6 6 5 4 5 473 Open Open DVM 1.5V 1 5V * Vp=Vpin1-0.03V * Vp = Vpin1 0 03V 33 Differential Amplifier Output Open Open 1 2 2 3 3 4 Vp 4 A Current2 16V 16V Open Open 8 8 7 7 6 6 5 1 Vp 1 Vp 16V 16V Open Open 8 8 7 7 6 6 5 1 2 2 3 3 4 Vp Open Open 5 IO(D)=? 66 Latch on Voltage 7 Latch Input Current 16V 16V > 6V >6V 2 2 3 3 4 4 9 1 DVM 4 V 473 V 5 ? 16V 8 8 7 7 6 6 5 1 2 2 3 3 4 473 16V > 6V >6V DVM 7 6 6 5 1.4V 1 4V 473 1 1 2 2 3 3 4 4 A 8 8 7 7 6 6 5 5 0 6V 0.6V 1 VIDC 8 8 7 Maximum Current Voltage 10 10 1 2 3 3 4 DVM 2 7 6 6 5 4 5 16V 16V Open Open Open 1 Open Open Open Open 2 2 3 3 4 ?? 473 473 0.2V 0 2V Supply Current2 11 11 6 6 5 5 VSM=? V ? A A Open 7 4 473 Open 12V 12V Icc=? I 7 A 8 8 7 1 473 A A Open Open 1 5V 1.5V I=7mA 100mA VIDC 100mA 473 473 5 ? A Open Open Diff. Input Clamp Voltage Open Open Open Open 473 5 ? 0.6V 1.5V ? Open Open 0 6V 1 5V 9 Open Open Open Open 16V 16V 0.8V A A Iout 0 8V Iout 8 8 7 88 Output Low Current 7 8 8 7 7 6 6 5 2 2 3 3 4 Open Open 0.8V 0 8V 1 1 1 4 A Io(D) = ? 1.5V 1 5V 1 Open Open Open Open Open Open 4 5 IO(D)=? A A Io(D) = ? Open Open Open Open 55 Output Current 44 Differential Amplifier Output Current1 Open >10V 10V 473 473 Open Open Open Open 1 I 1 8 8 7 2 7 2 3 3 4 4 6 6 5 5 A A ? 0.6V 0 6V 12V 12V 473 473 Open OpenOpen Open Response Time 13 13 Latch Off Supply Voltage 12 12 0.3Vp-p 0 3V 100mA 1 100mA 1 Open Open 2 2 3 3 4 4 Open Open 8 8 7 7 6 6 5 5 0.8V 1 8V 1 12V 12V 473 473 DVM 100 1V<Vx<5 1V V 5 100 1 2 2 3 3 4 4 8 8 7 7 6 6 5 5 16V 16V DVM 473 473 473 473 3 KA2803B Typical Characteristics Figure 1. Supply Current Figure 3. Differential Amp. Output Current VR, VI=VP, VOD=0.8V Figure 5. Output Low Current 4 Figure 2. Differential Amp. Output Current VR-VI=30mV, VOD=1.2V Figure 4. Output Current Figure 6. Vcc Voltage Vs. Supply Current 1 KA2803B Typical Characteristics (Continued) Figure 7. Differential Amp. Output Current 1 Figure 9. Latch Input Current Figure 11. Output Current Figure 8. Differential Amp. Output Figure 10. Output Low Current Figure 12. Vcc Voltage Vs. Supply Current 2 5 KA2803B Typical Characteristics (Continued) Figure 13. Differential Input Clamp Voltage Figure 15. Latch On Input Voltage Figure 17. Trip & Output 6 Figure 14. Latch Off Supply Voltage Figure 16. Maximum Supply KA2803B Typical Characteristics (Continued) INPUT VR: Variable VI : Constant OD OUTPUT OS OUTPUT Figure 18. Output Response Time 7 KA2803B Application Circuit Figure 1. Full Wave Application Circuit Figure 2. Half Wave Application Circuit Application Note (refer to full wave application circuit Fig. 1) The Fig 1 shows the KA2803B connected in a typical leakage current detector system. The power is applied to the VCC terminal (Pin 8) of the KA2803B directly from the power line. The resistor RS and capacitor CS are chosen so that pin 8 voltage is at least 12V. The value of CS is recommended above 1µF at this time. 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 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 put when the high current is injected at the breaker, this resistor should be used to protect the earth leakage detector IC the KA2803B. The range of RP is from several hundredΩ to several kΩ. The capacitor C1, is for the noise canceller and standard value of C1 is 0.047µF. Also the capacitor C2 is noise canceller capacitance but it is not usually used. When high noise is only appeared at this system 0.047µF capacitor may be connected between pin 6 and pin 7. The amplified signal is finally appeared to 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 breaker is decided by the capacitor C3 and the mechanism breaker. This capacitor should be selected under 1µF for the required the 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 your application want the detail information, request it on our application circuit designer of KA2803B. 8 KA2803B Mechanical Dimensions Package Dimensions in millimeters #4 #5 1.524 ±0.10 0.060 ±0.004 0.46 ±0.10 #8 2.54 0.100 9.60 MAX 0.378 #1 9.20 ±0.20 0.362 ±0.008 ( 6.40 ±0.20 0.252 ±0.008 0.018 ±0.004 0.79 ) 0.031 8-DIP 5.08 MAX 0.200 7.62 0.300 3.40 ±0.20 0.134 ±0.008 3.30 ±0.30 0.130 ±0.012 0.33 MIN 0.013 +0.10 0.25 –0.05 +0.004 0~15° 0.010 –0.002 9 KA2803B Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP MIN #5 6.00 ±0.30 0.236 ±0.012 10 MAX0.10 MAX0.004 8° 0~ +0.10 0.15 -0.05 +0.004 0.006 -0.002 0.50 ±0.20 0.020 ±0.008 1.80 MAX 0.071 3.95 ±0.20 0.156 ±0.008 5.72 0.225 0.41 ±0.10 0.016 ±0.004 #4 1.27 0.050 #8 5.13 MAX 0.202 #1 4.92 ±0.20 0.194 ±0.008 ( 0.56 ) 0.022 1.55 ±0.20 0.061 ±0.008 0.1~0.25 0.004~0.001 KA2803B Ordering Information Product Number Package KA2803B 8-DIP KA2803BD 8-SOP Operating Temperature -20 ~ +80°C 11 KA2803B DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 9/5/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation