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LM1851 データシート(PDF) 5 Page - Texas Instruments

部品番号 LM1851
部品情報  Ground Fault Interrupter
Download  10 Pages
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

LM1851 データシート(HTML) 5 Page - Texas Instruments

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Typical Performance Characteristics
Average Trip Time vs
Normal Fault Current
Threshold vs RSET
Fault Current
Output Drive Current vs
Pin 1 Saturation Voltage vs
External Load Current IL
Output Voltage
TLH5177 – 4
Circuit Description
(Refer to Block and Connection Diagram)
The LM1851 operates from 26V as set by an internal shunt
regulator D3 In the absence of a fault (Ife0) the feedback
path status signal (VS) is correspondingly zero Under these
conditions the capacitor discharge current I1 sits quies-
cently at three times its threshold value ITH so that noise
induced charge on the timing capacitor will be rapidly re-
moved When a fault current If is induced in the secondary
of the external sense transformer the operational amplifier
A1 uses feedback to force a virtual ground at the input as it
extracts If The presence of If during either half-cycle will
cause VS to go high which in turn changes I1 from 3ITH to
ITH Although ITH discharges the timing capacitor during
both half-cycles of the line If only charges the capacitor
during the half-cycle in which If exits pin 2 Thus during one
half-cycle If–ITH charges the timing capacitor while during
the other half-cycle ITH discharges it When the capacitor
voltage reaches 175V the latch engages and turns off Q3
permitting I2 to drive the gate of an SCR
4


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