FAN1851AMX_NL

更新时间： 2024-11-29 13:01:51

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		断路器
页数	文件大小	规格书
11页	123K
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数据手册

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FAN1851AMX_NL 数据手册

www.fairchildsemi.com

FAN1851A

Ground Fault Interrupter

Features

Description

• 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

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.

• Grounded neutral fault detection

• Meets UL943 standards

• 450µA quiescent current

• Ideal for 120V or 220V systems

• Package options: 8L DIP and 8L SOIC

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

Timing

Capacitor

Sensitivity

Set Resistor

Sense Amplifier

Output

for I > 0

3I for I = 0

I =

SCR Trigger

Latch

10V

Ground

Inverting Input

Non-Inverting Input

REV. 2.0.1 6/17/05

12 3 4 5 6 7...11

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