M54125L Earth Leakage Current Detector REJ03F0033-0100Z Rev.1.0 Sep.16.2003 Description The M54125L is a semiconductor integrated circuit having the functions of an amplifier for use with high-speed ground-fault breakers. Features • • • • • • Satisfies JIS C 8371 Good temperature characteristic of the input sense current (VLKT = 9 mV) Internal neutral line open-phase (N open) detection function Few external components Good stability with respect to noise, surges Broad operating temperature range (Ta = –20 to 80°C) Applications • High-speed ground-fault breakers Summary of functions The M54125L is an integrated circuit used in the amplification unit of a high-speed ground-fault breaker, and consists of a differential amplifier, one-shot circuit, output circuit, constant-current circuit, waveform-shaping circuit, and delay circuit. Operation is explained below, based on the block diagram, application example, and operating waveforms. Block diagram Rev.1.0, Sep.16.2003, page 1 of 10 M54125L Pin Configuration (Top View) Rev.1.0, Sep.16.2003, page 2 of 10 M54125L Absolute maximum ratings (unless otherwise noted, Ta = –20 to 80°C) Symbol Quantity Conditions Rated value Unit Is Power supply voltage Mean current over one cycle of the power supply frequency 0 to 6 mA Is (so) ∆VILK VIBL Power supply surge current ILK input voltage IBL input voltage (Note 1) Taking pin VB to be ground potential 0 to 12 –1.8 to +1.8 –0.3 to 6 mA V V VOUT OUT applied voltage With external voltage applied –0.3 to 4 V Pd Power consumption 160 mW Topr Operating temperature –20 to 80 °C Tstg Storage temperature –55 to 125 °C Note 1: The IS(SG) current waveform is as shown below; one surge or less in a given minute is assumed. Recommended operating conditions (unless otherwise noted, Ta = –20 to °C) Symbol Quantity Vs Is Power supply voltage Power supply current CMM CWF CTD Rx External capacitor MM External capacitor WF External capacitor TD External resistor RX Rated value Min. when OUT is off Mean current over one cycle of the power supply frequency Max. 12 Note: Handling of unused pins when the abnormal voltage detection function not used: • Pin Rx is open • Pin TD is shorted to GND • Pin WF and pin IBL are open are shorted to GND Rev.1.0, Sep.16.2003, page 3 of 10 Typ. Unit 5.6 0.22 1 6.8 27 V mA µF µF µF kΩ M54125L Leakage Detection Function When a leakage current Ig occurs on the primary side of ZCT (a zero-phase current transformer), a leakage signal voltage VILK appears in the secondary-side output, and is input to the ILK input pin, with the bias pin VB as reference. During the half-cycle in which VILK is negative, in the interval in which the voltage is equal to or below the DC trip voltage VLKT, the capacitor CMM connected to the pin MM is charged. In this case, if the pin MM voltage VMM does not reache the MM positive-direction threshold voltage, when the charging interval ends the capacitor CMM is discharged with a current larger than the charging current. If the pin voltage VMM reaches the MM positive-direction threshold voltage, at this time the output OUT is "ON" (the state in which output current is flowing out), and at the same time a small current is discharged from the capacitor CMM. When VMM falls to the MM negative-direction threshold voltage, the output OUT is returned to "OFF" (the state in which output current flows in). That is, the leakage current for which the dead time tMM coincides with the interval during which the amplitude of the input voltage VILK is equal to or greater than the DC trip voltage VILK becomes the sense current of the ground-fault breaker. The output OUT is "ON" for the length of time tOUT, and the output current turns on the thyristor, effectively causing the breaker to operate. Abnormal Voltage Detection Function Normally, the rectified voltage of an AC power supply with uniform amplitude is voltage-divided and input to the abnormal voltage input pin IBL as the voltage VIBL. In this case, if the neutral line N is interrupted, depending on the load states of the voltage lines A and B, the input voltage VIBL may become a rectified voltage with amplitude alternating between high and low. At this time, the capacitor CWF connected to the pin WF discharges during the interval in which the amplitude of VIBL is equal to or greater than the abnormal voltage trip voltage VBLT. (When the discharge interval ends, the charging interval begins.) When the WF pin voltage VWF falls below the WF threshold voltage, the capacitor CTD of pin TD begins to charge, and after the delay time tTD has elapsed, when the TD pin voltage VTD reaches the TD threshold voltage, the output OUT is turned "ON", effectively causing the breaker to operate. When single-shot noise is superposed on the input voltage VIBL causing it to rise above VBLT, the original state is restored after approximately time tWF, thus preventing erroneous operation. Current flows in this abnormal voltage detection unit to enable operation only when an external resistor RX is connected to pin RX. Rev.1.0, Sep.16.2003, page 4 of 10 M54125L Operation Waveform Diagrams Rev.1.0, Sep.16.2003, page 5 of 10 M54125L Electrical Characteristics (unless otherwise noted, VCC = 5 V, Ta=-20 to 80°C) Symbol Quantity Measurement conditions Rated value Temperature Min. Unit Test circuit Max. IS1 Power supply current 1 VS Vs = 12V, ∆ILK = 0mV, Out : ”OFF” 0.7 mA 1 IS2 Power supply current 2 VS 1.2 mA 1 VLKT Trip voltage ILK and VB Vs = 16V, ∆ILK = –15mV, Out : “ON” Vs = 16V, ∆VILK = 60Hz 4 9 mVrms 3 IMM+ Sink current MM Vs = 16V, ∆ILK = 0mv VMN = 0.8V 25 170 370 µA 4 IMM– Source current MM Vs = 16V, ∆ILK = –15mV VMN = 0.8V 25 –110 –250 ms 4 tMM Dead time MM Vs = 16V 1.7 4 µA 10 IOU+ Sink current OUT Vs = 16V, ∆ILK = 0mv VMN = 0.2V 150 µA 5 IOU– Source current OUT Vs = 16V, ∆ILK = –15mv VMN = 0.8V –20 –200 µΑ 5 25 –100 80 IOUT Output pulse width OUT Vs = 16V VSM Voltage at max. current VS Is = 3.5mA, IS3 Power supply current 3 VS IS4 Power supply current 4 VS VBLT Trip voltage IBL Vs = 16V, IIBL Input current IBL Vs = 16V,VIBL = 4.5V 25 IWF+ IWF– tWF ITD+ ITD– tDT Sink current Source current Return time Sink current Source current Delay time WF WF WF TD TD TD Vs = 16V,VIBL = 4.5V, VWF = 0.5V Vs = 16V,VIBL = 0V VWF = 0.5V Vs = 16V, Vs = 16V, VIBL = 0V, VTD= 0.5V Vs = 16V, VIBL = 4.5V, VTD= 0.5V Vs = 16V, 25 25 Rev.1.0, Sep.16.2003, page 6 of 10 –70 25 100 ms 10 20 26 V 6 Vs = 12V, VILK : 0mV VIBL = 0V, OUT :”OFF” 1 mA 2 Vs = 12V, VILK : 0mV VIBL = 0V, OUT :”ON” 1.4 mA 2 25 3.7 25 25 1 –22 35 1 –22 200 4.1 V 7 0.8 µΑ 7 mA µΑ ms mA µΑ ms 8 8 11 9 9 12 –30 70 –30 420 M54125L Application Circuit Example Rev.1.0, Sep.16.2003, page 7 of 10 M54125L Measurement Circuits (unless otherwise specified, CMM = 0.22 µF, CWF = 1 µF, CTD=6.8 µF, RX = 27 kΩ) Rev.1.0, Sep.16.2003, page 8 of 10 M54125L Rev.1.0, Sep.16.2003, page 9 of 10 HE G Z1 1 10 e EIAJ Package Code SOP10-P-300-1.27 E Rev.1.0, Sep.16.2003, page 10 of 10 z D y Detail G b 5 6 JEDEC Code − x M F Weight(g) 0.12 A L1 A2 Detail F c Lead Material Alloy 42/Cu Alloy A1 Symbol e1 b2 e1 I2 A A1 A2 b c D E e HE L L1 z Z1 x y b2 Dimension in Millimeters Min Nom Max − − 2.15 − − 0.05 − − 1.75 0.4 0.45 0.55 0.13 0.15 0.2 5.93 6.13 6.33 5.1 5.3 5.5 − − 1.27 7.82 8.12 8.42 0.3 0.5 0.7 − − 0.41 − − 0.525 − − 0.675 − − 0.25 0.1 − − − 0° 10° − − 0.76 − − 7.62 − − 1.27 Recommended Mount Pad e Plastic 10pin 300mil SOP I2 10P2-C M54125L Package Dimensions L Sales Strategic Planning Div. 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