MITSUBISHI <CONTROL / DRIVER IC> M54122L EARTH LEAKAGE CURRENT DETECTOR The M54122L is a semiconductor integrated circuit with amplifier for a high-speed earth leakage circuit breaker. FEATURES ● Suitable for JIS C 8371 ● Good temperature characteristics of input sensitivity current ● High input sensitivity (VT = 13.5mV Typ.) ● Low external component count ● High noise and surge-proof ● Low power dissipation (Pd = 5mW Typ.) and may be used both as 100V and 200V. ● High mounting density by SIL package with 8 pins ● Wide temperature range (Ta = -20 – +80°C) PIN CONFIGURATION (TOP VIEW) Reference voltage VR → 1 Input IN → 2 GND 3 Differential amplifier output OD ← 4 Latch input SC → 5 Terminal for noise absorption NR → 6 Output OS ← 7 VS 8 APPLICATION BIAS DESCRIPTION AMP LATCH High speed earth leakage circuit breaker REG FUNCTION The M54122L circuit for the amplifying parts of earth leakage circuit breaker consists of differential amplifier, latch circuit and voltage regulator. It is connected to the secondary side of the zerocurrent transformer (ZCT) which detects leakage current in the both input of the differential amplifier. Signals amplified by differential amplifier are integrated by an external capacitor, and connects to the input terminal of latch circuit with output suitable for the characteristics of high-speed earth leakage circuit breaker. Latch circuit keeps low in the output till the input voltage reaches the fixed level, and output becomes high when the leakage current more than fixed flows. It drives a thyristor connected to the output terminal of latch circuit. Outline 8P5 BLOCK DIAGRAM Latch circuit Reference voltage generation circuit VS 8 AMP 7 GND 3 1 2 4 5 6 VR Reference voltage IN Input OD Differential amplifier output SC Latch input NR Terminal for noise absorption OS output MITSUBISHI <CONTROL / DRIVER IC> M54122L EARTH LEAKAGE CURRENT DETECTOR ABSOLUTE MAXIMUM RATINGS (Ta = -20 – 80°C unless otherwise noted) Parameter Symbol IS Conditions Supply current IVR VR terminal current IIN IN terminal current ISC Pd Topr Tstg SC terminal current Power dissipation Operating temperature Storage temperature Between VR-IN (Note 1) Between VR-GND Between IN-VR (Note 1) Between IN-VR (Note 1) Between IN-GND Between VR-IN (Note 1) Ratings Unit 8 250 30 -250 250 30 -250 5 mA mA mA mA mW °C °C 200 -20 – 80 -55 – 125 Note 1: Current value between VR and IN, and between IN and V R is less than 1ms in the pulse width, and duty cycle is less than 12%. In applying AC current continuously, it is 100mArms in the off-state. Remarks: GND terminal (pin 3 ) of the circuit is a basis of all the voltages except differential input clamp voltage of DC electrical characteristics, and direction of current is plus (no signal) in flowing into the circuit and is minus (– signal) in flowing out of it. Maximum value and minimum one are shown as absolute value. Please don’t apply voltage whose standard is GND terminal in VR and IN pin. RECOMMENDED OPERATING CONDITIONS (Ta = -20 – 80°C unless otherwise noted) Symbol VS CVS COS Parameter Supply voltage when latch circuit is off-state. External capacitor between VS and GND External capacitor between OS and GND Min. 12 Limits Typ. Max. 1 1 Unit V µF µF ELECTRICAL CHARACTERISTICS (Ta = -20 – 80°C unless otherwise noted) Symbol Parameter Test conditions IS1 Supply current VS = 12V, VR-VI = 30mV VT Trip voltage ITD1 Timed current 1 VS = 16V, VR-VI (Note 2) VS = 16V, VR-VI = 30mV VOD = 1.2V ITD2 Timed current 2 IO Output current VSC “ON” ISC “ON” IOSL VIC VIDC VSM IS2 SC ON voltage (Note 3) SC input current Output low-level current Input clamp voltage Differential input clamp voltage Maximum current voltage Supply current 2 (Note 4) VS “OFF” TON Latch circuit off-state supply voltage (Note 6) Operating time (Note 7) VS = 16V, short circuit between VR and VI, VOD = 0.8V IS1 = 580µA VSC = 1.4V IS1 = 530µA VOS = 0.8V IS1 = 480µA VS = 16V VS = 12V VS = 12V, VOSL = 0.2V VS = 12V, IIC = 20mA IIDC = 100mA ISM = 7mA VR-VI VOS = 0.6V (Note 5) VS = 16V, VR-VI = 0.3V Temperature(°C) Test circuit -20 25 80 -20 – +80 1 1 1 2 10 25 3 25 -20 25 80 25 25 Limits Typ.∗ Unit Max. 580 530 480 17 mVrms -12 -30 µA 4 17 37 µA -200 -100 -75 0.7 -20 – +80 5 5 5 6 7 8 9 10 11 12 25 13 0.5 25 14 2 -20 – +80 -20 – +80 -20 – +80 25 Min. 400 200 4.3 0.4 20 13.5 µA µA 1.4 5 6.7 2 28 900 V µA µA V V V µA V 4 ms Note ∗ : Typical values are at Ta = 25°C. Note 2: When standard value of voltage (60Hz) between VR and VI is minimum, and output OS is low-level, or when standard value of voltage (60Hz) between VR and VI is maximum, and output OS is high-level, it is considered as a good one. Note 3: When standard value of voltage VSC “ON” is minimum, and output OS is low-level, or when standard value of voltage VSC “ON” is maximum, and output OS is high-level, it is considered as a good one. Note 4: Supply current 2 is necessary to keep high in output OS. Note 5: After applying 30mV between VR and VI and shorting between them, it is considered as a good one if standard value of IGT flows out of output OS. Note 6: After supply voltage applies 12V and output OS is high-level, it is considered as a good one in the standard value of supply voltage and in the low-level of output OS. Note 7: Operating time is a time from applying fixed input till operating latch circuit in 0.047µF between OD and GND. MITSUBISHI <CONTROL / DRIVER IC> M54122L EARTH LEAKAGE CURRENT DETECTOR TEST CIRCUIT 1 2 VR IN GND OD SC NR OS VS 1 2 3 4 5 6 7 8 100 0.047 µF 0.047 µF VI VR IN GND OD SC NR OS VS IS 1 VS Open 3 4 2 3 4 5 6 7 VR IN GND OD SC NR OS VS 8 VS VI Vrms 0.047 µF 1 2 3 4 5 6 7 0.047 µF 1 2 3 0.047 µF 0.047 µF VOD ITD2 4 7 5 Open 3k Open VI 6 7 Open 8 IS 2 3 4 5 Open 100 VI 6 7 8 VS ISC “ON” µF 1 0.047 µF 10 2 3 4 5 Open VOS 2 3 4 5 6 7 6 7 4 5 Open 6 7 8 VS Open 3k VOS 0.047 µF 1 2 3 VSC 0.047 µF “ON” IIC 4 5 Open 100 VOSL 0.047 µF 2 3 VIDC 4 5 Open 100 0.047 µF 6 7 8 VS Open 0.047 µF VIC 0.047 µF 6 7 0.047 µF VR IN GND OD SC NR OS VS 8 1 2 ISM Open VSM 0.047 µF VI 13 0.047 µF 0.047 µF 12 1 Open IIDC 3 VI 8 VS VR IN GND OD SC NR OS VS 8 8 VS VR IN GND OD SC NR OS VS 11 1 2 0.047 µF Open IOSL VI VR IN GND OD SC NR OS VS 7 9 100 0.047 1 VR IN GND OD SC NR OS VS Open VOS 6 Open VOD 100 8 1 5 VR IN GND OD SC NR OS VS IO VSC 0.047 µF VR IN GND OD SC NR OS VS 4 ITD1 VI VR IN GND OD SC NR OS VS 8 VS 3 6 Open 100 2 100 VOS 0.047 µF 5 VR IN GND OD SC NR OS VS 1 Open 100 1k 0.047 µF 3 4 5 6 Open 100 7 8 VOS IS2 VI 0.047 0.047 IGT µF µF 0.047 µF 14 VR IN GND OD SC NR OS VS 1 2 3 4 5 6 Open 100 VI 7 VR IN GND OD SC NR OS VS 8 VS “OFF” 0.047 0.047 VOS 0.047 µF µF µF 1 2 3 4 5 6 7 8 VS Open 100 VI 0.047 0.047 µF µF 0.047 µF Note: The unit of resistance is ohm. Please insurt 0.01µF between pin 1 and pin 3 in test. MITSUBISHI <CONTROL / DRIVER IC> M54122L EARTH LEAKAGE CURRENT DETECTOR TYPICAL CHARACTERISTICS VCC voltage vs. supply voltage Supply current 1 vs. supply voltage 12 700 Ta = -25°C Supply current 1 IS1 (µA) VCC voltage VCC (V) 10 25°C 8 75°C 6 4 2 0 600 500 Ta = -25°C 400 25°C 75°C 300 200 100 8 10 12 14 16 18 0 20 5 Supply voltage VS (V) 10 15 20 25 30 Supply voltage VS (V) VCC voltage generates by the constant voltage circuit in IC. This is measured not by M54122L but by a special element. Reference voltage vs. supply voltage Bias current vs. ambient temperature 2.5 1000 2.0 900 800 25°C -25°C Bias current IIN (nA) Reference voltage VR (V) Ta = 75°C 1.5 1.0 700 600 500 400 300 200 0.5 100 0 0 4 8 12 16 0 -40 20 0 20 40 60 80 100 Ambient temperature Ta (°C) Supply voltage VS (V) Differential amplifier output voltage vs. differential input voltage Timed current 1 vs. ambient temperature -50 5 Timed current 1 ITD1 (µA) Differential amplifier output voltage VOD (V) -20 4 3 2 Ta = 75°C 1 25°C -25°C 0 10 12 14 16 18 20 Differential input voltage ∆VI = VR – VIN (mV) -40 -30 -20 -10 0 -40 -20 0 20 40 60 80 Ambient temperature Ta (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54122L EARTH LEAKAGE CURRENT DETECTOR OS voltage vs. SC voltage Operating time vs. ambient temperature 4.5 6 Ta = 75°C 25°C Operating time TON (ms) OS voltage VOS (V) 8 -25°C 4 2 0 0.4 0.6 0.8 1 1.2 1.4 1.6 4 3.5 3 2.5 2 -50 1.8 SC voltage VSC (V) -25 0 25 50 75 100 Ambient temperature Ta (°C) Trip voltage vs. ambient temperature Output current vs. OS output voltage -400 20 Trip voltage VT (mVrms) Output current IO (µA) Ta = -25°C -300 25°C -200 75°C -100 0 0 1 2 3 4 5 OS output voltage VOS (V) 6 7 16 12 8 4 0 -50 -25 0 25 50 75 Ambient temperature Ta (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54122L EARTH LEAKAGE CURRENT DETECTOR APPLICATION EXAMPLE • HIGH-SPEED LEAKAGE CIRCUIT BREAKER WITH M54122L Supply voltage circuit Amplifier Output circuit M54122L Trip coil AC line R2 VS 8 C4 Voltage regulator Reference voltage generator Latch circuit AMP 3 GND 1 2 RL 4 5 RP 100Ω 6 7 C3 C1 C2 AC line R1 Note 8 SCR CR2AM CR03AM CR02AM C5 Note 9 ZCT Note 8 : Gate current must be selected. Please select voltage resistance by AC supply voltage. 9 : MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary) Tel. +81-427-74-7813 Operating time vs. input voltage 1000 700 500 300 Operating time tD (ms) Supply voltage circuit is connected as a previous diagram. Please decide constants R1, R2, C4, and C5 of a filter in order to keep at least 12V in VS, when normal supply current flows. In this case, please connect C4 (more than 1µF) and C2 (less than 1µF). ZCT and load resistance R L of ZCT are connected between input pin 1 and 2 . In this case protective resistance (RP = 100Ω) must be insurted. Sensitivity current is regulated by RL, and output of amplifier shows in pin 4 . External capacitor C1 between pin 44 and GND is used for noise removal. When large current is grounded in the primary side (AC line) of ZCT, the wave form in the secondary side of ZCT is distorted and some signals doesn’t appear in the output of amplifier. So please connect a varistor or a diode (2 pcs.) to ZCT in parallel. Latch circuit is used to inspect the output level of amplifier and to supply gate current on the external SCR. When input pin becomes more than 1.1V (Typ.), latch circuit operates and supply gate current in the gate of SCR connected to the output pin 7 . Pin 6 can be used in the open state, but please connect capacitor (about 0.047µF) between pin 6 and pin 7 . C1 = 0.047µF Ta = 25°C 60HZ 100 70 50 30 10 7 5 3 1 1 3 5 7 10 30 50 100 70 300 1000 500 Input voltage V1 (mVrms)