Fairchild Semiconductor RV4141A Datasheet
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RV4141A
Low Power Ground Fault Interrupter
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
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 interrupter. 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 independent 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.
Block Diagram
Amp Out
V
FB
V
REF
Gnd
RV4141A
Cap
–
+
+
–
+
+
–
Delay
–
4.7K
65-4141-01
SCR
+V
S
Line
REV. 1.0.1 7/8/03
PRODUCT SPECIFICATION RV4141A
Pin Assignments
Amp Out
V
FB
V
REF
GND
1
2
3
4
65-4141A-02
8
7
6
5
Delay Cap
SCR Trigger
+V
S
Line
Absolute Maximum Ratings
(beyond which the device may be damaged)
Parameter Min Typ Max Units
Supply Current 10 mA
Internal Power Dissipation 500 mW
Storage Temperature Range -65 +150 °C
Operating Temperature Range -35 +80 °C
Junction Temperature 125 °C
Lead Soldering Temperature 60 Sec, DIP 300 °C
Notes:
1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if
Operating Conditions are not exceeded.
1
10 Sec, SOIC 260 °C
Thermal Characteristics
Parameter Min Typ Max Units
θ
JA
Thermal resistance SOIC 240 °C/W
PDIP 160 °C/W
2
REV. 1.0.1 7/8/03
RV4141A PRODUCT SPECIFICATION
Electrical Characteristics
(I
= 1.5mA and T
LINE
= +25°C, R
A
= 650k Ω )
SET
Parameters Test Conditions Min Typ Max Units
Shunt Regulator (Pins 5 to 4)
Regulated Voltage I
Regulated Voltage I
Quiescent Current V
= 11µA 25.0 27.0 29.0 V
2-3
= 750 µA, I
LINE
= 24V — 500 — µA
5-4
= 9µA 25.0 27.0 29.0 V
2-3
Sense Amplifier (Pins 2 to 3)
Offset Voltage -200 0 200 µV
Gain Bandwidth (Design Value) — 1.5 — MHz
Input Bias Current (Design Value) 30 100 nA
SCR Trigger (Pins 7 to 4)
Output Resistance V
Output Voltage I
Output Voltage I
Output Current V
= Open, I
7-4
= 9µA 0 0.1 10 mV
2-3
= 11µA 2.4 3.0 3.6 V
2-3
= 0V, I
7-4
= µA 3.8 4.7 5.6 k Ω
2-3
= 11µA 400 600 µA
2-3
Reference Voltage (Pins 3 to 4)
Reference Voltage I
= 750 µA 12.0 13.0 14.0 V
LINE
Delay Timer (Pins 8 to 4)
Delay Time (Note 1) C
Delay Current I
Note:
1. Delay time is defined as starting when the instantaneous sense current (I
trigger voltage V
goes high.
7-6
= 12nF — 2.0 — ms
8-4
= 11µA 30 40 50 µA
2-3
) exceeds 6.5 V/R
2-3
and ending when the SCR
SET
REV. 1.0.1 7/8/03
3
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