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FAN1851AMX Datasheet

  • FAN1851AMX

  • Ground Fault Interrupter

  • 11頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN1851A
Ground Fault Interrupter
Features
鈥?Improved performance over industry equivalents
鈥?Tight fault current range (Typ 鹵100碌A(chǔ))
鈥?Temperature compensated fault current characteristics
鈥?No external trimming required
鈥?Direct interface to SCR
鈥?Supply voltage derived from AC line鈥?6V shunt
鈥?Adjustable sensitivity
鈥?Grounded neutral fault detection
鈥?Meets UL943 standards
鈥?450碌A(chǔ) quiescent current
鈥?Ideal for 120V or 220V systems
鈥?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
Sense Amplifier
Output
I
TH
D3
I
2
Q2
SCR Trigger
Q3
Latch
Q1
I
F
I
I
1
=
TH
for I
F
> 0
3I
TH
for I
F
= 0
D1
A1
Q4
I
F
+V
S
Q5
D2
10V
Ground
Inverting Input
Non-Inverting Input
REV. 2.0.1 6/17/05

FAN1851AMX 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • 專用 IC

  • -

  • 控制器

  • 接地故障保護(hù)

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOIC

  • 帶卷 (TR)

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