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UNISONIC TECHNOLOGIES CO., LTD GF4146 CMOS IC www.unisonic.com.tw 1 of 5 Copyright © 2017 Unisonic Technologies Co., Ltd QW-R121-032.B GROUND FAULT INTERRUPTER DESCRIPTION The UTC GF4146 is a two-wire low-power controller for Residual Current Devices (RCD) and AC outlet Appliance Leakage Circuit Interrupters (ALCI) . The UTC GF4146 detects hazardous grounding conditions and open circuits the line before a harmful shock occurs. Internally, the UTC GF4146 contains a diode rectifier, 12V shunt regulator using a precision temperature-compensated bandgap reference, precision low V OS offset-sense amplifier, time delay noise filter, window-detection comparat ors, and a SCR driver. With the addition of a minimum number of external components, the UTC GF4146 detects and protects against a hot-wire-to-ground fault. The UTC GF4146 circuitry has a built-in rectifier and shunt regulator that operates wi th a low quiescent current. This allows for a high-value, low-wattage-series supply resistor. The internal temperature compensated shunt regulator, sens e amplifier, and bias circuitry provide for precision ground-fault detection. The low V OS offset-sense amplifier allows direct coupl ing of the sense coil to the amplifier’s feedback signal. This eliminates the large 50/60Hz AC -coupling capacitor. The intern al delay filter rejects high-frequency noise spikes common with inductive loads. This decreases false nuisance tripping. The internal SCR driver is temperature compensated and designed to satisfy the current r equirements for a wide selection of external SCRs. FEATURES * For Two-Wire ALCI and RCD Applications * Precision Sense Amplifier and Bandgap Reference * Built-in AC Rectifier * Direct DC Coupled to Sense Coil * Low-Voltage SCR Disable * Adjustable Sensitivity * Built-in Noise Filter * SCR Gate Driver * Minimum External Components * Meets UL 943B Requirements * Ideal for 120V or 220V Systems ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package Packing GF4146L-AG6-R GF4146G-AG6-R SOT-26 Tape Reel MARKING
UNISONIC TECHNOLOGIES CO., LTD 2 of 5 www.unisonic.com.tw Q W - R 1 2 1 - 0 3 2 . B PIN CONFIGURATION VFB VREF Neutral AmpOutSCR Line PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION
1 SCR Gate drive for external SCR
2 Neutral Supply input
3 Line Supply input
4 V REF Non-inverting input for current-sense amplifier
5 V FB Inverting input for current-sense amplifier
6 AmpOut External resistor sets the I fault sensitivity threshold connected to VFB
BLOCK DIAGRAM - -+
UNISONIC TECHNOLOGIES CO., LTD 3 of 5 www.unisonic.com.tw Q W - R 1 2 1 - 0 3 2 . B ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Current I CC 15 mA 16 V Supply Voltage All other pins VCC -0.8 ~ 15 V Storage Temperature Range T STG -65 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (Ishunt=1mA, TA=25°C, Unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Line to Neutral 12.2 12.7 13.2Power Supply Shunt Regulator Voltage VREG Line to Neutral, Ishunt=-2mA -0.9 -0.7 V Quiescent Current I Q Line to Neutral=10V 350 400 450 µA Reference Voltage V REF V REF to Neutral 5.8 6.0 6.2 V Trip Threshold V TH AmpOut to V REF 3.4 3.5 3.6 V Amplifier Offset V OS R SET=511KΩ, RIN=500Ω -450 0 450 µV Amplifier Input Offset I OS Design Value -50 0 50 nA Amplifier DC Gain G Design Value 100 dB Amplifier Gain Bandwidth (Note 5) fGBW Design Value 1.5 MHz Amplifier Positive Voltage Swing VSW+ AmpOut to V REF, IFAULT=10µA 4.0 V Amplifier Negative Voltage Swing VSW- V REF to AmpOut, IFAULT=-10µA 4.0 V Amplifier Current Sink I SINK AmpOut=V REF+3V, VFB=VREF+100mV 400 µA Amplifier Current Source I SRL AmpOut=V REF-3V, VFB=VREF-100mV 400 µA Delay Filter t d Delay from COMP1 Trip to SCR, Low to High 0.75 1.00 1.25 ms SCR Output Resistance R OUT SCR to Neutral=250mV, AmpOut=V REF 0.5 1.0 K Ω SCR to Neutral, AmpOut=VREF 1 10 mVSCR Output Voltage V OUT SCR to Neutral, AmpOut =VREF+4V 2.5 V SCR Output Current I OUT SCR to Neutral=1V, AmpOut=V REF+4V 350 500 µA
UNISONIC TECHNOLOGIES CO., LTD 4 of 5 www.unisonic.com.tw Q W - R 1 2 1 - 0 3 2 . B TYPICAL APPLICATION CIRCUIT SCR Neutral Line AmpOut VFB VREF UTC GF4146 RSET RIN Sense Coil 1:1000 Load Hot Load Neutral TESTRTEST Line Hot Line Neutral MOV 120/220VAC ALCI Application (Note 2) Typical Values R1: 91KΩ (Wattage Determined by Maximum VAC) RTEST: 15KΩ RIN: 470Ω RSET: 511KΩ (Note 1) C1: 22nF 1. Value depends on sense-coil characteristics and application (value chosen for 5mA trip threshold). 2. Contract Fairchild for best application practices for nuisance tripping rejection. UTC GF4146 RSET RIN Sense Coil 1:1300 Load Hot Load Neutral TESTRTEST Line Hot Line Neutral MOV Typical Values R1: 174KΩ (Wattage Determined by Maximum VAC) RSET: 324KΩ (Note 3) C1: 22nF RTEST: 15KΩ RIN: 470Ω C2: 10nF 3. Value depends on sense-coil characteristics and application (value chosen for 10mA trip threshold). 4. Contract Fairchild for best application practices for nuisance tripping rejection. Notes: Notes: SCR Neutral Line AmpOut VFB VREF
UNISONIC TECHNOLOGIES CO., LTD 5 of 5 www.unisonic.com.tw Q W - R 1 2 1 - 0 3 2 . B UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.