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參數資料
型號: FAN1851A
廠商: Fairchild Semiconductor Corporation
英文描述: Ground Fault Interrupter
中文描述: 接地故障遮斷
文件頁數: 1/11頁
文件大小: 122K
代理商: FAN1851A
www.fairchildsemi.com
REV. 2.0.1 6/17/05
Features
Improved performance over industry equivalents
– Tight fault current range (Typ ±100μA)
– Temperature compensated fault current characteristics
– No external trimming required
Direct interface to SCR
Supply voltage derived from AC line—26V shunt
Adjustable sensitivity
Grounded neutral fault detection
Meets UL943 standards
450μA quiescent current
Ideal for 120V or 220V systems
Package options: 8L DIP and 8L SOIC
Description
The FAN1851A is a controller for AC outlet ground fault
interrupters. These devices detect hazardous grounding con-
ditions (example: a pool of water or an 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 in the circuitry rapidly resets
the integrating timing capacitor in the event that noise pulses
introduce unwanted charging currents. Also, a flip-flop is
included that ensures firing of even a slow circuit breaker
relay on either of the two half-cycles 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
+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
1
=
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
FAN1851A
Ground Fault Interrupter
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