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| MITSUBISHI M54125L/P EARTH LEAKAGE CURRENT DETECTOR DESCRIPTION The M54125 is a semiconductor integrated circuit consisting of an amplifier for high-speed earth leakage circuit breaker. PIN CONFIGURATION (TOP VIEW) Capacitor MM 1 FEATURES q Satisfies JIS C 8371 q Temperature-stable input current trigger threshold (VLKT = 9mV) q Capable of detecting a lost phase on the neutral line q Economical, low external component count q Highly resistant to noise and power surges q Wide operating temperature range (Ta = -20 - +80C) Output OUT 2 GND NC Capacitor CTD 3 4 TD 5 NC 6 M54125L Capacitor CWF Input WF 7 IBL 8 RX 9 NC 10 11 12 APPLICATION High-speed earth-leakage circuit breakers External resistor FUNCTION The M54125 is a semiconductor integrated circuit for use in the amplifier section of earth-leakage circuit breakers. It consists of a differential amplifier, one-shot circuit, output circuit, current regulator, waveform regulator and delay circuit. The following description refers to the block diagram, application example, and operational waveforms. Input Bias voltage NC VS ILK 13 VB 14 Outline 14P5A Input Bias voltage ILK 1 VB 2 10 VS N.C: no connection 9 RX External resistor M54125P Capacitor MM 3 Output OUT 4 GND 5 8 IBL Input 7 WF Capacitor CWF 6 TD Capacitor CTD Outline 10P2-C BLOCK DIAGRAM (Note: Pin No. in parentheses are of M54125L) VS 10 (12) External resistor RX 9 (9) Input IBL 8 (8) Capacitor CWF WF 7 (7) Capacitor CWF TD 6 (5) Bias current source Voltage regulator Comparator VBLT Waveform regulator Delay circuit VCC VB A * VLKT A Amplifier Comparator One-shot multi vibrator Output circuit (13) 1 ILK Input 2 (14) 3 VB Bias (1) 4 (2) 5 OUT Output (3) GND M54125L/P MM Capacitor MITSUBISHI M54125L/P EARTH LEAKAGE CURRENT DETECTOR ABSOLUTE MAXIMUM RATINGS (Ta = -20 - 80C unless otherwise noted) Symbol IS IS(SO) VILK VIBL VOUT Pd Topr Tstg Parameter Supply voltage Supply surge current ILK input voltage IBL input voltage OUT applied voltage Power dissipation Operating temperature Storage temperature Conditions Average supply current frequency per cycle (Note 1) Pin VB serves as the voltage reference When external voltage is applied Ratings 0-6 0 - 12 -1.8 - +1.8 -0.3 - 6 -0.3 - 4 160 -20 - 80 -55 - 125 Unit mA mA V V V mW C C Note 1: IS(SG) current waveform, which is given in the following diagram, shall be one shot or less per minute. 12mA IS(SG) 6mA 0mA 1S 40S RECOMMENDED OPERATING CONDITIONS (Ta = -20 - 80C unless otherwise noted) Symbol VS IS CMM CWF CTD RX Supply voltage Supply current External capacitor MM External capacitor WF External capacitor TD External resistor RX Parameter When output OUT is OFF Average power supply current per cycle Min. 12 Limits Typ. Max. Unit V 5.6 0.22 1 6.8 27 mA F F F k Handling of unused pins when the abnormal voltage detection function is not used * Pin RX must be left open * Pin TD must be shorted to GND * Pin WF and pin IBL may be left open or shorted to GND MITSUBISHI M54125L/P EARTH LEAKAGE CURRENT DETECTOR LEAKAGE DETECTION FUNCTION When leakage current current Ig appears on the primary side of zero-current transformer, ZCT, leakage signal voltage VILK appears on the secondary side and is input at ILK with bias VB as the reference. In the half cycle when VILK is negative, capacitor CMM connected to MM charges until VILK reaches the DC trip voltage. If the voltage at MM does not reach the MM positive threshold voltage, when the charging phase is completed, capacitor CMM discharges at a small current. The output OUT is reset to the off state (in which output current flows in) when VMM descends to the MM negative threshold voltage. Earth-leakage currents are detected when the amplitude of input voltage VILK exceeds the DC trip voltage VLKT for longer than the detection time tMM. The output OUT turns on for time tOUT. The output current is used to turn on the thyristor that opens the breaker contacts. ABNORMAL VOLTAGE DETECTION FUNCTION Normally VIBL, fixed amplitude AC supply that has been rectified and divided by a resistor, is input to abnormal voltage input IBL. When a fault occurs in the neutral line N, successive peaks of VIBL become alternately small and large, with the levels determined by the load on the AC power lines A and B. When the amplitude of VIBL exceeds the abnormal voltage trip voltage VBLT, capacitor CWF connected to pin WF discharges. After the discharge shase is completed, charging begins again.) When voltage VWF at WF drops below the WF threshold voltage, capacitor CTD at TD charges, and after delay time tTD, when voltage VTD at TD reaches the TD threshold voltage, output OUT turns on, activating the circuit breaker. To avoid misoperation due to the effect of repeated one-shot noise that brings VIBL above VBLT, the voltage drops to the initial value only after time tWF. This abnormal voltage detection circuit is enabled only when an external resistor RX is connected to pin RX to enable the current flow. WAVEFORM DIAGRAM 1) Voltage waveform when earth leakage is detected. VILK ILK VB VB VLKT MM positive direction threshold voltage VMM Note: Values in the parentheses are for reference only. MM negative direction threshold voltage MM 0 IMM (3ms) OUT 0 tOUT(45ms) 2) Voltage waveform when abnormal voltage is detected. VISL Noise VBTL(3.9V) IBL 0 VWF WF threshold voltage WF 0 tWF(55ms) VTD TD threshold voltage TD 0 tTD(300ms) OUT 0 MITSUBISHI M54125L/P EARTH LEAKAGE CURRENT DETECTOR ELECTRICAL CHARACTERISTICS (VCC = 5V and Ta = -20 - 80C unless otherwise noted) Symbol IS1 IS2 VLKT IMM+ IMMtMM IOU+ IOUtOUT VSM Parameter Supply current 1 Supply current 2 Trip voltage Sink current Source current Detect inhibit time Sink current Source current Output pulse width Maximum current voltage Supply current 3 Pin VS Pin VS Pin ILK and VB Pin MM Pin MM Pin MM Pin OUT Pin OUT Pin OUT Pin VS Test conditions VS = 12V, VILK = 0mV, Out : "OFF" VS = 16V, VILK = -15mV, Out : "ON" VS = 16V, VLKT : 60Hz Test circuit 3 VS = 16V, VILK = 0mV, VMM = 0.8V VS = 16V, VILK = -15mV, VMM = 0.8V VS = 16V VS = 16V, VILK = 0mV, VOUT = 0.2V VS = 16V, VILK = -15mV VOUT = 0.8V VS = 16V IS = 3.5mA VS = 12V, VILK : 0mV VIBL = 0V, OUT : "OFF" Test circuit 2 VS = 12V, VILK : -15mV VIBL = 12V, OUT : "ON" Test circuit 2 VS = 16V VS = 16V, VIBL = 4.5V Test circuit 7 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 25 25 25 1 -22 35 1 -22 200 3.6 25 Temperature Limits Min. Max. 0.7 1.2 4 9 370 -250 4 Unit mA mA mVrms A A ms A A Test circuit 1 1 25 25 -20 25 80 170 -110 1.7 150 -200 -100 -70 25 20 4 4 10 5 5 10 6 100 26 ms V IS3 Pin VS 1 mA IS4 VBLT IIBL IWF+ IWFtWF ITD+ ITDtDT Supply current 4 Trip voltage Input current Sink current Source current Recovery time Sink current Source current Delay time Pin VS Pin IBL Pin IBL Pin WF Pin WF Pin WF Pin TD Pin TD Pin TD 1.4 4.1 0.8 mA V A mA A ms mA A ms 8 8 11 9 9 12 7 -30 70 -30 420 APPLICATION EXAMPLE AC power input ANB TD CWF RX VS RX IBL WF CTD Bias current source Voltage regulator VCC VB Comparator VBLT A * VLKT Waveform regulator Delay circuit A Amplifier ILK VB Comparator One-shot multivibrator Output circuit M54125L/P MM CMM OUT GND ANB Load Note 2 ZCT Note 2 : MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary) Tel. +81-427-74-7813 MITSUBISHI M54125L/P EARTH LEAKAGE CURRENT DETECTOR TEST CIRCUIT (CMM = 0.22F, CTD = 6.8F and RX = 27k unless otherwise noted) 1 IS 1 and IS 2 Measurement 2 VS IS 3 and IS 4 Measurement VS VILK VILK ILK VB MD234 or Equivalent CMM MM OUT VOUT GND IBL WF TD VOUT VS RX A IS 1, IS 2 ILK VB CMM MM OUT GND VS RX IBL CWF WF TD CTD RX A IS 3, IS 4 VIBL : IS 2 is the value after OUT turns on. (Vout > 0.5V) : IS 4 is the value after OUT turns on. 3 VLKT 4 VS VIBL ILK VB CMM MM OUT IBL WF TD VS RX IMM+ and IMM- Measurement VS VILK ILK VB A IMM+ IMMVMM MM OUT GND VS RX IBL WF TD VOUT GND : VLKT is the value of VIBL when OUT turns on as VIBL is gradually increased. 5 IOU+, IOU- Measurement VS VILK ILK VB CMM IOU+ A IOUVOUT MM OUT GND IBL WF TD VS RX 6 VSM Measurement ILK VB MM OUT GND VS RX IBL WF TD IS + VSM V - MITSUBISHI M54125L/P EARTH LEAKAGE CURRENT DETECTOR 7 VBLT, IIBL Measurement VS 8 IWF+, IWF- Measurement VS ILK VB MM OUT GND VS RX IBL WF TD + V VWF VIBL RX IIBL A ILK VB MM OUT GND VS RX IBL WF TD IWF+ A IWFVWF VIBL RX : VBLT is the value of VIBL when VF = 0.5V. 9 ITD+, ITD- Measurement 10 tMM, tOUT Measurement VS VS VILK ILK VB CMM VS RX IBL WF TD ILK VB MM OUT GND VS RX IBL WF TD ITD+ A ITDVTD VILK VIBL RX VOUT MM OUT GND 10ms 1.8V 1.4V VOUT tMM 0.5V tOUT 11 tWF Measurement VS 12 tTD Measurement VS ILK VB MM OUT GND VS RX IBL CF WF TD 0.5V 3k VTD VOUT RX VIBL ILK VB MM OUT GND VS RX IBL CF WF CTD TD RX VIBL VIBL VTD 4.5V 0V 0.5V tWF VIBL VOUT tTD 0V 0.5V 4.5V |
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