RV4140A

www.fairchildsemi.com RV4140A Low Power Two-Wire Ground Fault Interrupter Controller Features Powered from the AC line Built-in bridge rectifier Direct interface to SCR 350 mA quiescent current Adjustable trip current Adjustable time delay Minimum external components Meets UL 943 requirements Specifically for two-wire systems For use with 110V or 220V systems Description The RV4140A is a low power controller for AC outlet appliance leakage circuit interrupters. These devices detect hazardous current paths to ground such as an appliance falling into water. The interrupter then open circuits the line before a harmful or lethal shock occurs. Internally, the RV4140A has a diode bridge rectifier, zener shunt regulator, op amp, current reference, time delay circuit, latch and SCR driver. An external sense transformer, SCR, relay, two resistors and three capacitors complete the design of the circuit interrupter. The simple layout and minimum component count ensure ease of application and long term reliability. Block Diagram RV4140A 1 8 2 Latch 4.7K Delay 7 3 Vcc 4 6 5 65-4140A-01 Rev. 1.0.0 RV4140A PRODUCT SPECIFICATION Functional Description (Refer to Block Diagram and Figure 1 ) The shunt regulator generated by a 6.5V zener diode is built into the internal bridge rectifier. It is divided to create an internal reference voltage of 2.9V connected to pin 3. The secondary of the sense transformer is AC coupled to the inverting input of the sense amplifier ...