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參數資料
| 型號： | LM1851 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Ground Fault Interrupter(電源接地失敗中斷器) |
| 中文描述： | 接地故障遮斷（電源接地失敗中斷器） |
| 文件頁數： | 1/12頁 |
| 文件大小： | 87K |
| 代理商： | LM1851 |
www.fairchildsemi.com
Features
No potentiometer required
Direct interface to SCR
Supply voltage derived from AC line—26V shunt
Adjustable sensitivity
Grounded neutral fault detection
Meets UL943 standards
450
m
A quiescent current
Ideal for 120V or 220V systems
Description
The LM1851 is a controller for AC outlet ground fault
interrupters. These devices detect hazardous grounding con-
ditions (example: a pool of water and electrical equipment
connected to opposite phases of the AC line) in consumer
and industrial environments. The output of the IC triggers an
external SCR, which in turn opens a relay circuit breaker to
prevent a harmful or lethal shock.
Full advantage of the U.S. UL943 timing specification is
taken to ensure maximum immunity to false triggering due
to line noise. A special feature is found in circuitry that
rapidly resets the integrating timing capacitor in the event
that noise pulses introduce unwanted charging currents.
Also, flip-flop is included that ensures firing of even a slow
circuit breaker relay on either half-cycle of the line voltage
when external full wave rectification is used.
The application circuit can be configured to detect both
normal faults (hot wire to ground) and grounded neutral
faults.
Block Diagram
65-1851-01
+V
S
Timing
Capacitor
Sensitivity
Set Resistor
I
TH
Sense Amplifier
Output
I
TH
for I
F
> 0
3I
TH
for I
F
= 0
I
TH
=
I
F
Q2
Q1
Latch
D3
I
2
Q3
Q4
A1
D1
I
F
Ground
Non-Inverting Input
10V
Inverting Input
SCR Trigger
Q5
D2
+V
S
LM1851
Ground Fault Interrupter
Rev. 1.0.0
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