FAN1851AMX Fairchild Semiconductor, FAN1851AMX Datasheet

IC CTRLR AC GRND FAULT 8SOIC

FAN1851AMX

Manufacturer Part Number
FAN1851AMX
Description
IC CTRLR AC GRND FAULT 8SOIC
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of FAN1851AMX

Product
Voltage References
Package / Case
SOIC-8
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
• Improved performance over industry equivalents
• 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
Block Diagram
FAN1851A
Ground Fault Interrupter
– Tight fault current range (Typ ±100µA)
– Temperature compensated fault current characteristics
– No external trimming required
SCR Trigger
D3
Q3
+V
S
I
I
2
F
Inverting Input
Capacitor
Timing
Latch
A1
Q1
Q2
D1
Non-Inverting Input
Q4
I
F
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.
Set Resistor
Sensitivity
+V
S
I
Q5
TH
I =
10V
D2
3I
I
TH
TH
for I
for I
Sense Amplifier
F
F
> 0
= 0
Output
www.fairchildsemi.com
Ground
REV. 2.0.1 6/17/05

Related parts for FAN1851AMX

FAN1851AMX Summary of contents

Page 1

FAN1851A Ground Fault Interrupter 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 ...

Page 2

FAN1851A Pin Assignments Functional Description The voltage at the supply pin is clamped to +26V by the internal shunt regulator D3. This shunt regulator also generates an artificial ground voltage for the noninverting input of A1 (shown as a +10V ...

Page 3

PRODUCT SPECIFICATION Normal Fault Plus Grounded Neutral Fault: The combination of the normal fault and the grounded neutral fault, as shown by the dashed lines in Figure 3. Hot Hot R GFI LOAD Line Neutral Neutral R G Figure 3. ...

Page 4

FAN1851A DC Electrical Characteristics (T = +25° mA) A SHUNT Parameters Power Supply Shunt Regulator Voltage Latch Trigger Voltage Sensitivity Set Voltage Output Drive Current Output Saturation Voltage Output Saturation Resistance Output External Current Sinking 1 Capability ...

Page 5

PRODUCT SPECIFICATION Typical Performance Characteristics 1000 100 UL943 Normal Fault 10 0 0.01 0.1 Trip Time (Seconds) Figure 4. Average Trip Time vs. Fault Current 1400 1200 1000 800 31V 600 1 400 ...

Page 6

FAN1851A Application Information A typical ground fault interrupter circuit is shown in Figure 10 designed to operate on 120 VAC line voltage with 5mA normal fault sensitivity. A full-wave rectifier bridge and a 15k /2W resistor are used ...

Page 7

PRODUCT SPECIFICATION where integration time V = threshold voltage I = average fault current into CT 120 V rms ⎛ ⎞ ⎛ ------------------------------------ - ---------------------- - ⎝ ⎠ ⎝ heavy fault portion ...

Page 8

FAN1851A Application Circuits C 0.002 A 300 mV Hot Load MOV Neutral Circuit Breaker 0.01/400V *Adjust R for desired sensitivity. SET Figure 10. 120 Hz Neutral Transformer Application 8 FAN1851A 7 -In Timing Cap 1 SCR +In Trigger T 5 ...

Page 9

FAN1851A Mechanical Dimensions 8-Lead Plastic DIP Package 6.40 0.20 0.252 0.008 #1 #4 7.62 0.300 5.08 MAX 0.200 3.40 0.20 0.134 0.008 PRODUCT SPECIFICATION 3.30 0.30 0.130 0.012 0.33 MIN 0.013 Dimensions in Millimeters REV. 2.0.1 6/17/05 ...

Page 10

FAN1851A Mechanical Dimensions 8-Lead Plastic SOIC Package Inches Millimeters Symbol Min. Max. Min. A .053 .069 1.35 A1 .004 .010 0.10 B .013 .020 0.33 C .008 .010 0.20 D .189 .197 4.80 E .150 .158 3.81 e .050 BSC ...

Page 11

... Ordering Information Part Number Package FAN1851AN 8-lead Plastic DIP FAN1851AMX 8-lead Plastic SOIC DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; ...

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