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参数资料
| 型号： | KA2803B |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 2/11页 |
| 文件大小： | 0K |
| 描述： | IC EARTH LEAKAGE DETECTOR 8-DIP |
| 标准包装： | 50 |
| 应用： | 接地漏电检测器 |
| 电流 - 电源： | 400µA |
| 电源电压： | 12 V ~ 20 V |
| 工作温度： | -25°C ~ 80°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
Block Diagram
Figure 1. Block Diagram
Application Circuit
Figure 2. Full-Wave Application Circuit
Application Information
(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 V CC terminal (Pin 8) directly from the power line.
The resistor R S and capacitor C S are chosen so that Pin
8 voltage is at least 12 V. The value of C S is
recommended above 1 μF.
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
Figure 3. Half-Wave Application Circuit
used to protect the earth leakage detector IC
(KA2803B). The range of R P is from several hundred
Ω to several k Ω .
Capacitor C 1 is for the noise canceller and a standard
value of C 1 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
C 3 and the mechanism breaker. This capacitor should
compensate for zero current
transformer (ZCT)
be selected under 1μF to satisfy the required trip time.
variations. The resistor R L should be selected so that
the breaker satisfies the required sensing current. The
protection resistor R P 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
2
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.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| KA2803B_11 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Earth Leakage Detector |
| KA2803B_NL | 功能描述:校验器 IC Earth Leak Detector RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| KA2803BD | 功能描述:校验器 IC Earth Leak Detector RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| KA2803BD_11 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Earth Leakage Detector |
| KA2803BDTF | 功能描述:校验器 IC Earth Leak Detector RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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