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LM1851N データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1851N
部品情報  Ground Fault Interrupter
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1851N データシート(HTML) 6 Page - National Semiconductor (TI)

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Application Circuits (Continued)
in practice the actual value of C1 will have to be modified to
include the effects of the neutral loop upon the net charging
current The effect of neutral loop induced currents is diffi-
cult to quantize but typically they sum with normal fault cur-
rents thus allowing a larger value of C1
For UL943 requirements 0015 mF has been found to be
the best compromise between timing and noise
For those GFI standards not requiring grounded neutral de-
tection a still larger value capacitor can be used and better
noise immunity obtained The larger capacitor can be ac-
commodated because RN and RG are not present allowing
the full fault current I to enter the GFI
In
Figure 2 grounded neutral detection is accomplished by
feeding the neutral coil with 120 Hz energy continuously and
allowing some of the energy to couple into the sense trans-
former during conditions of neutral fault
Typical Application
TLH5177 – 6
Adjust RSET for desired sensitivity
FIGURE 2 120 Hz Neutral Transformer Approach
6


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同様の説明 - LM1851N

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