MITSUBISHI <CONTROL / DRIVER IC> 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 Output OUT 2 FEATURES APPLICATION High-speed earth-leakage circuit breakers 3 NC 4 Capacitor CTD 5 TD Capacitor CWF 7 WF Input IBL 8 External resistor RX 9 NC 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. GND Input 6 NC 10 NC 11 VS 12 M54125L Satisfies JIS C 8371 Temperature-stable input current trigger threshold (VLKT = 9mV) Capable of detecting a lost phase on the neutral line Economical, low external component count Highly resistant to noise and power surges Wide operating temperature range (Ta = -20 - +80C) ILK 13 VB Bias voltage 14 Outline 14P5A ILK 1 Input VB 2 3 Capacitor MM Output OUT 4 GND 10 VS 9 RX M54125P Bias voltage N.C: no connection 8 IBL Input WF Capacitor CWF 7 TD 6 5 Outline 10P2-C BLOCK DIAGRAM (Note: Pin No. in parentheses are of M54125L) External resistor RX 9 (9) VS 10 (12) Input IBL 8 (8) Bias current source Capacitor CWF WF 7 (7) Capacitor CWF TD 6 (5) Waveform regulator Delay circuit One-shot multi vibrator Output circuit Comparator Voltage regulator VBLT VCC A * VLKT VB A Amplifier (13) Comparator (14) 1 2 ILK Input VB Bias (1) M54125L/P External resistor (2) (3) 3 4 5 MM Capacitor OUT Output GND Capacitor CTD MITSUBISHI <CONTROL / DRIVER IC> M54125L/P EARTH LEAKAGE CURRENT DETECTOR ABSOLUTE MAXIMUM RATINGS (Ta = -20 - 80C unless otherwise noted) Symbol Parameter IS Supply voltage IS(SO) Supply surge current VILK ILK input voltage VIBL VOUT Pd Topr Tstg 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 Unit 0-6 mA 0 - 12 mA -1.8 - +1.8 V -0.3 - 6 -0.3 - 4 160 -20 - 80 -55 - 125 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 40S 1S RECOMMENDED OPERATING CONDITIONS (Ta = -20 - 80C unless otherwise noted) Parameter Symbol VS Supply voltage IS Supply current CMM CWF CTD RX External capacitor MM External capacitor WF External capacitor TD External resistor RX When output OUT is OFF Average power supply current per cycle 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 Min. 12 Limits Typ. Max. Unit V 5.6 0.22 1 6.8 27 mA F F F k MITSUBISHI <CONTROL / DRIVER IC> M54125L/P EARTH LEAKAGE CURRENT DETECTOR LEAKAGE DETECTION FUNCTION ABNORMAL VOLTAGE DETECTION FUNCTION When leakage current current Ig appears on the primary side of zero-current transformer, ZCT, leakage signal voltage V ILK 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. 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 Note: Values in the parentheses are for reference only. MM positive direction threshold voltage MM negative direction threshold voltage VMM MM 0 IMM (3ms) OUT 0 tOUT(45ms) 2) Voltage waveform when abnormal voltage is detected. VISL IBL VBTL(3.9V) 0 VWF WF Noise WF threshold voltage 0 TD threshold voltage tWF(55ms) VTD TD 0 OUT 0 tTD(300ms) MITSUBISHI <CONTROL / DRIVER IC> M54125L/P EARTH LEAKAGE CURRENT DETECTOR ELECTRICAL CHARACTERISTICS (VCC = 5V and Ta = -20 - 80C unless otherwise noted) Symbol Parameter Test conditions Temperature Pin VS Pin VS VS = 12V, VILK = 0mV, Out : "OFF" VS = 16V, VILK = -15mV, Out : "ON" Sink current Source current Detect inhibit time Sink current Pin ILK and VB Pin MM Pin MM Pin MM Pin OUT 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 25 25 IOU- Source current Pin OUT VS = 16V, VILK = -15mV VOUT = 0.8V -20 25 80 tOUT Output pulse width Pin OUT VS = 16V VSM Maximum current voltage Pin VS IS = 3.5mA IS3 Supply current 3 Pin VS IS4 Supply current 4 VBLT Trip voltage IS1 IS2 Supply current 1 Supply current 2 VLKT Trip voltage IMM+ IMMtMM IOU+ Limits Min. Max. 0.7 1.2 Unit mA mA 4 9 mVrms 170 -110 1.7 150 -200 -100 -70 25 370 -250 4 A A ms A 4 4 10 5 A 5 100 ms 10 20 26 V 6 VS = 12V, VILK : 0mV VIBL = 0V, OUT : "OFF" Test circuit 2 1 mA Pin VS VS = 12V, VILK : -15mV VIBL = 12V, OUT : "ON" Test circuit 2 1.4 mA Pin IBL VS = 16V 4.1 V 0.8 A IIBL Input current Pin IBL IWF+ IWFtWF ITD+ ITDtDT Sink current Source current Recovery time Sink current Source current Delay time Pin WF Pin WF Pin WF Pin TD Pin TD Pin TD 25 3.6 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 -30 70 -30 420 APPLICATION EXAMPLE CWF AC power input A N B CTD RX VS IBL RX Bias current source Voltage regulator WF TD Waveform regulator Delay circuit One-shot multivibrator Output circuit Comparator VBLT VCC VB A * VLKT A Amplifier ILK VB Test circuit 1 1 Comparator M54125L/P MM OUT GND CMM Note 2 ZCT Note 2 : MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary) Tel. +81-427-74-7813 A N B Load mA A ms mA A ms 7 8 8 11 9 9 12 MITSUBISHI <CONTROL / DRIVER IC> M54125L/P EARTH LEAKAGE CURRENT DETECTOR TEST CIRCUIT (CMM = 0.22F, CTD = 6.8F and RX = 27k unless otherwise noted) 1 2 IS 1 and IS 2 Measurement IS 3 and IS 4 Measurement VS VS VILK VILK ILK VB MD234 or Equivalent VS RX A ILK IS 1, IS 2 CMM A VS VB RX RX IS 3, IS 4 CMM MM IBL MM IBL OUT WF OUT WF GND TD GND TD CWF VOUT VOUT VIBL CTD : IS 2 is the value after OUT turns on. (Vout > 0.5V) 3 : IS 4 is the value after OUT turns on. 4 VLKT IMM+ and IMM- Measurement VS VS VILK VIBL ILK VS ILK VS VB RX VB RX MM IBL MM IBL OUT WF GND TD CMM OUT VOUT GND A IMM+ IMM- WF VMM TD : VLKT is the value of VIBL when OUT turns on as VIBL is gradually increased. 5 6 IOU+, IOU- Measurement VSM Measurement VS VILK ILK VS ILK VS VB RX VB RX IOU+ MM IBL MM IBL A OUT WF OUT WF IOU- GND TD GND TD CMM VOUT + VSM V IS MITSUBISHI <CONTROL / DRIVER IC> M54125L/P EARTH LEAKAGE CURRENT DETECTOR 7 8 VBLT, IIBL Measurement IWF+, IWF- Measurement VS ILK VS VB RX MM IBL OUT WF GND TD VS ILK VS VB RX MM IBL OUT WF GND TD RX IIBL A RX IWF+ A IWF- VIBL + V VWF - VIBL VWF : VBLT is the value of VIBL when VF = 0.5V. 9 10 ITD+, ITD- Measurement VS tMM, tOUT Measurement VILK VS ILK VS VB RX MM IBL OUT WF GND TD CMM ILK VS VB RX MM IBL OUT WF ITD+ GND TD A RX VOUT VIBL VTD ITD- 10ms VILK 1.8V 1.4V 0.5V VOUT tOUT tMM 11 tWF Measurement ILK tTD Measurement VS VB RX MM IBL RX VIBL CF OUT 12 VS WF VS ILK VS VB RX MM IBL OUT WF GND TD VIBL CTD VTD TD VIBL CF 0.5V 3k GND RX VOUT 4.5V 4.5V 0V VTD 0.5V tWF VIBL 0V 0.5V VOUT tTD