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參數(shù)資料
| 型號： | KA2803BD |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Earth Leakage Detector |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 147K |
| 代理商： | KA2803BD |
KA2803B
8
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 V
CC
terminal (Pin 8) of the KA2803B directly from the power line.
The resistor R
S
and capacitor C
S
are chosen so that pin 8 voltage is at least 12V.
The value of C
S
is recommended above 1
μ
F 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 R
L
should be selected so that the breaker satisfies the required sensing current.
The protection resistor R
P
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 R
P
is from several hundred
to several k
.
The capacitor C
1
, is for the noise canceller and standard value of C
1
is 0.047
μ
F. Also the capacitor C
2
is noise canceller
capacitance but it is not usually used.
When high noise is only appeared at this system 0.047
μ
F 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 C
3
and the mechanism breaker.
This capacitor should be selected under 1
μ
F 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.
Figure 1. Full Wave Application Circuit
Figure 2. Half Wave Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KA2803BD_11 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Earth Leakage Detector |
| KA2803BDTF | 功能描述:校驗器 IC Earth Leak Detector RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| KA2804 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:LINEAR INTEGRATED CIRCUIT |
| KA2804N | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:LINEAR INTEGRATED CIRCUIT |
| KA2807 | 功能描述:SCR Earth Leak Detector RoHS:否 制造商:STMicroelectronics 最大轉(zhuǎn)折電流 IBO:480 A 額定重復(fù)關(guān)閉狀態(tài)電壓 VDRM:600 V 關(guān)閉狀態(tài)漏泄電流（在 VDRM IDRM 下）:5 uA 開啟狀態(tài) RMS 電流 (It RMS): 正向電壓下降:1.6 V 柵觸發(fā)電壓 (Vgt):1.3 V 最大柵極峰值反向電壓:5 V 柵觸發(fā)電流 (Igt):35 mA 保持電流（Ih 最大值）:75 mA 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-220 封裝:Tube |
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