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RV4141A 데이터시트 PDF




Fairchild Semiconductor에서 제조한 전자 부품 RV4141A은 전자 산업 및 응용 분야에서
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부품번호 RV4141A 기능
기능 Low Power Ground Fault Interrupter
제조업체 Fairchild Semiconductor
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RV4141A 데이터시트, 핀배열, 회로
RV4141A
Low Power Ground Fault Interrupter
www.fairchildsemi.com
Features
• Powered from the AC line
• Built-in rectifier
• Direct interface to SCR
• 500 µA quiescent current
• Precision sense amplifier
• Adjustable time delay
• Minimum external components
• Meets UL 943 requirements
• For use with 110V or 220V systems
• Available in 8 pin DIP or SOIC package
Block Diagram
Amp Out
RV4141A
VFB
VREF
Gnd
+
Description
The RV4141A is a low power controller for AC receptacle
ground fault circuit interrupters. These devices detect
hazardous current paths to ground and ground to neutral
faults. The circuit interrupter then disconnects the load from
the line before a harmful or lethal shock occurs.
Internally, the RV4141A contains a diode rectifier, shunt
regulator, precision sense amplifier, current reference, time
delay circuit, and SCR driver.
Two sense transformers, SCR, solenoid, three resistors and
four capacitors complete the design of the basic circuit inter-
rupter. The simple layout and minimum component count
insure ease of application and long term reliability.
Features not found in other GFCI controllers include a low
offset voltage sense amplifier eliminating the need for a
coupling capacitor between the sense transformer and sense
amplifier, and an internal rectifier to eliminate high voltage
rectifying diodes.
The RV4141A is powered only during the positive half
period of the line voltage, but can sense current faults inde-
pendent of its phase relative to the line voltage. The gate of
the SCR is driven only during the positive half cycle of the
line voltage.
Cap
+
+
SCR
+
Delay
4.7K
+VS
Line
65-4141-01
REV. 1.0.1 7/8/03




RV4141A pdf, 반도체, 판매, 대치품
PRODUCT SPECIFICATION
RV4141A
Circuit Operation
(Refer to Block Diagram and Figure 1)
The precision op amp connected to Pins 1 through 3 senses
the fault current flowing in the secondary of the sense trans-
former, converting it to a voltage at Pin 1. The ratio of sec-
ondary current to output voltage is directly proportional to
feedback resistor, RSET.
RSET converts the sense transformer secondary current to a
voltage at Pin 1. Due to the virtual ground created at the
sense amplifier input by its negative feedback loop, the sense
transformer's burden is equal to the value of RIN. From the
transformer's point of view, the ideal value for RIN is 0.
This will cause it to operate as a true current transformer
with minimal error. However, making RIN equal to zero cre-
ates a large offset voltage at Pin 1 due to the sense amplifier's
very high DC gain. RIN should be selected as high as possi-
ble consistent with preserving the transformer's operation as
a true current mode transformer. A typical value for RIN is
between 200 and 1000.
As seen by the equation below, maximizing RIN minimizes
the DC offset error at the sense amplifiers output. The DC
offset voltage at Pin 1 contributes directly to the trip current
error. The offset voltage at Pin 1 is:
VOS x RSET/(RIN + RSEC)
Where:
VOS = Input offset voltage of sense amplifier
RSET = Feedback resistor
RIN = Input resistor
RSEC = Transformer secondary winding resistance
The sense amplifier has a specified maximum offset voltage
of 200 µV to minimize trip current errors.
Two comparators connected to the sense amplifier output are
configured as a window detector, whose references are -6.5
volts and +6.5 volts referred to Pin 3. When the sense trans-
former secondary RMS current exceeds 4.6/RSET the output
of the window detector starts the delay circuit. If the second-
ary current exceeds the predetermined trip current for longer
than the delay time a current pulse appears at Pin 7, trigger-
ing the SCR.
The SCR anode is directly connected to a solenoid or relay
coil. The SCR can be tripped only when its anode is more
positive than its cathode.
Supply Current Requirements
The RV4141A is powered directly from the line through a
series limiting resistor called RLINE, its value is between
24 kand 91 k. The controller IC has a built-in diode
rectifier eliminating the need for external power diodes.
The recommended value for RLINE is 24 kto 47 kfor
110V systems and 47 kto 91 kfor 220V systems. When
RLINE is 47 kthe shunt regulator current is limited to
3.6 mA. The recommended maximum peak line current
through RLINE is 10 mA.
GFCI Application (Refer to Figure 1)
The GFCI detects a ground fault by sensing a difference cur-
rent in the line and neutral wires. The difference current is
assumed to be a fault current creating a potentially hazardous
path from iine to ground. Since the line and neutral wires
pass through the center of the sense transformer, only the dif-
ferential primary current is transferred to the secondary.
Assuming the turns ratio is 1:1000 the secondary current is
1/1000th the fault current. The RV4141A’s sense amplifier
converts the secondary current to a voltage which is com-
pared with either of the two window detector reference volt-
ages. If the fault current exceeds the design value for the
duration of the programmed time delay, the RV4141A will
send a current pulse to the gate of the SCR.
Detecting ground to neutral faults is more difficult. RB repre-
sents a normal ground fault resistance, RN is the wire resis-
tance of the electrical circuit between load/ neutral and earth
ground. RG represents the ground to neutral fault condition.
According to UL 943, the GFCI must trip when RN = 0.4,
RG = 1.6and the normal ground fault is 6 mA.
Assuming the ground fault to be 5 mA, 1 mA and 4 mA will
go through RG and RN, respectively, causing an effective 1
mA fault current. This current is detected by the sense trans-
former and amplified by the sense amplifier. The ground/
neutral and sense transformers are now mutually coupled by
RG, RN and the neutral wire ground loop, producing a posi-
tive feedback loop around the sense amplifier. The newly
created feedback loop causes the sense amplifier to oscillate
at a frequency determined by ground/neutral transformer
secondary inductance and C4. Typically it occurs at 8 KHz.
C2 is used to program the time required for the fault to be
present before the SCR is triggered. Refer to the equation
below for calculating the value of C2. Its typical value is
12 nF for a 2 ms delay.
RSET is used to set the fault current at which the GFCI trips.
When used with a 1:1000 sense transformer, its typical value
is 1 Mfor a GFCI designed to trip at 5 mA.
RIN should be the highest value possible which insures a
predictable secondary current from the sense transformer.
If RIN is set too high, normal production variations in the
transformer permeability will cause unit to unit variations in
the secondary current. If it is too low, a large offset voltage
error at Pin 1 will be present. This error voltage in turn cre-
ates a trip current error proportional to the input offset volt-
age of the sense amplifier. As an example, if RIN is 500,
4 REV. 1.0.1 7/8/03

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RV4141A 전자부품, 판매, 대치품
RV4141A
Mechanical Dimensions (continued)
8-Lead SOIC Package
Symbol
A
A1
B
C
D
E
e
H
h
L
N
α
ccc
Inches
Min. Max.
.053 .069
.004 .010
.013 .020
.008 .010
.189 .197
.150 .158
.050 BSC
.228 .244
.010 .020
.016 .050
8
0° 8°
.004
Millimeters
Min. Max.
1.35 1.75
0.10 0.25
0.33 0.51
0.20 0.25
4.80 5.00
3.81 4.01
1.27 BSC
5.79 6.20
0.25 0.50
0.40 1.27
8
0° 8°
0.10
Notes
5
2
2
3
6
PRODUCT SPECIFICATION
Notes:
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
2. "D" and "E" do not include mold flash. Mold flash or
protrusions shall not exceed .010 inch (0.25mm).
3. "L" is the length of terminal for soldering to a substrate.
4. Terminal numbers are shown for reference only.
5. "C" dimension does not include solder finish thickness.
6. Symbol "N" is the maximum number of terminals.
85
EH
14
D
A1
A
SEATING C
e PLANE LEAD COPLANARITY
B ccc C
α
h x 45°
C
L
REV. 1.0.1 7/8/03
7

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RV4141

Low Power Ground Fault Interrupter

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Low Power Ground Fault Interrupter

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