M54124L

M54124L MITSUBISHI | Alldatasheet

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EARTH LEAKAGE CURRENT DETECTOR M 54124L MITSUBISHI <CONTROL / DRIVER IC> PIN C O N FIG URAT IO N TO P VIEW DES CRIPT IO N The M54124L is a semiconductor integrated circuit consisting of an amplifier for a high-speed earth-leakage circuit breaker. FEAT URES l Satisfies JIS C 8371 l Temperature-stable input current threshold l High-input sensitivity (V T = 6.5mV) l Low external component count l Highly resistant to noise and power surges l Low power dissipation (P d = 5mW typ) l Can be used at 100V and 200V l High-density mounting eight-pin SIL package l Wide operating temperature range (Ta = -20 – +80 APP LICAT IO N High-speed earth-leakage circuit breakers FUNCT IO N The M54124L 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 and voltage regulator. It is connected to the secondary side of the zero-current transformer, ZCT, and detects leakage current in both inputs of the differential amplifier. Signals amplified by the differential amplifier are integrated by an external capacitor, and applied to the input pin of a one-shot multivibrator circuit having time-delay characteristics that are suitable for high-speed earth-leakage circuit breakers (such as specified in JIS C 8371). The one-shot multivibrator circuit normally maintains a low output. When the input current (earth- leakage) exceeds a specified level, a one-shot high pulse is output to turn on an externally connected thyristor. Outline 8P5 Differential amplifier output Reference voltage Input One shot multivibrator A One shot multivibrator B M54124L Output B LOC K D IAGR A M V R GND IN MA MB OS V S OD fi fi fi MA Differential amplifier output Input Reference voltage V R One shot multivibrator A Regulator Output circuit IN V R GND OD One shot multivibrator A MB One shot multivibrator B OS Output V S V R V CC One shot multivibrator B Comparator

EARTH LEAKAGE CURRENT DETECTOR M 54124L MITSUBISHI <CONTROL / DRIVER IC> OP ER A TION Discussion refers to the block diagram, application example, and operational waveform diagram.

• When an earth leakage current appears on the primary side of zero-current transformer ZCT, leakage signal voltage VIN appears on the secondary side and is input at IN with VR as the reference.
• In the half cycle when VIN is negative, capacitor C MA connected to pin MA charges until V IN reaches the trip voltage VT (DC). If voltage VMA at pin MA does not reach the MA threshold voltage, capacitor CMA discharges immediately at a current greater than the charge current, when the charging current phase is completed. When V MA reaches the M A threshold voltage, capacitor CMA discharges at a small current for a period time tCO during which the output of one-shot multivibrator A is high.
• During tCO , the same operation takes place again at capacitor C MB , causing one-shot multivibrator B to trigger current pulse of duration tOS at output pin OS.
• Earth leakage currents are detected when the amplitude of input voltage VIN exceeds the trip voltage VT (DC) for longer than the input detection time tMA .
• The output current is used to turn on the thyristor that opens the breaker contacts. OP ER A TING W A VEFOR M D IAGR A M : MA input detection time : MA detector on time : MB input detection time : OS output pulse width (MB detector on time) tMA tCO tMB tOS Note. The values in the parentheses are typical values for reference only. tMA (3ms )* VR IN VR Earth leakage signalVIN H L Comparator 0MA OD H L One-shot 0MB 0OS MA “ON” voltage MA “OFF” voltage MB “ON” voltage MB “OFF” voltage VT(DC) VMA VMB VOS tCO (65ms ) tMB (3ms ) tOS (95ms ) A1 output 1 output

EARTH LEAKAGE CURRENT DETECTOR M 54124L MITSUBISHI <CONTROL / DRIVER IC> Supply voltage Power dissipation Input current MA input current IS ABS O LUT E M AXIM UM RA TING S (Ta = -20 – 80°C unless otherwise noted) Symbol Ratings UnitParameter Conditions IIN IMA -250– +250 mA mA Pd Topr Operating temperature Storage temperature 200 mW (Note 1) Between IN and VR (Note 2) Between VR and GND, and between IN and GND When external voltage is applied When external voltage is applied When external voltage is applied -20– 80 -55– 125 mA Note 1: The surge waveform The waveform of surge current IS(SG) is shown on the left. It is applied less than once per minute. IS (SG) IIG VOD VOS Tstg Supply surge current Input pin current OD applied voltage OS applied voltage V V mA mA V REC O M M ENDE D O PERA TIN G C O NDITIO N S (Ta = -20 – 80°C unless otherwise noted) Limits Min. Typ. Max.Symbol UnitParameter VS Supplyvoltage when output is OFF 12 Capacitance between VSand GND C VS C OS Capacitance between OS and GND 1 mF mF EL ECT R ICAL CHARACT ERISTICS (Ta = -20 – 80°C unless otherwise noted) mA V mVrms mA Limits Min. Typ. Max.Symbol Test conditions UnitParameter IS Supply current -75 200 -150 1.2 VS = 12V, VIN = -15mV -200 -100 -75 –0.4 800 240 3.4 V mA ms Trip voltage OD sink current OD source current MA “ON” voltage VT VMAH VMAL IMBL VINC VRCL tMA tCO tMB tOS VS = 16V, VIN:60Hz sine wave VS = 16V, VIN = 0mV, VOD = 4V VS = 16V, VIN = -15mA Tempera- ture (°C ) Test circuit -20 +25 +80 VS = 16V, VIN = -15mA 4.4 1.7 –2.0 6.6 4.0 100 4.0 V V ms ms Note: VIN, is the input voltage with VR as reference. VIN is applied to IN through resistor R IN. C MA C MB R IN Capacitance between MA and GND Capacitance between MB and GND External resistor at IN 0.1 0.1 100 mF mF W IODL IODH IMBH IOSL IOSH VSM MA “OFF” voltage MB sink current MB source current OS sink current OS source current VS maximum current voltage IN, VR input clamp voltage VR clamp voltage MA input detection time MA detector on time MB input detection time OS input detection time IS = 7mA VS : open,IIN = –100mA VS = 16V, IVR = 20mA VS = 16V VS = 16V VS = 16V VS = 16V VS = 16V, VIN = -15mV, VOD = 4V VS = 16V, VIN = 0mA, VMB = 1.6V VS = 16V, VIN = -15mA, VMB = 1.6V VS = 16V, VIN = 0mA, VOS = 0.2V VS = 12V, VIN = -15mA, VOS = 1.6V ms 1.7 -150 240 2.8 0.8 120 -75 120 150 mA mA V mA mA 100% 40ms 50% IS(SG) 1ms 0m A Note 2: Applies to currents between IN and VR with pulse widths less than 1ms and duty cycles less than 12%. If AC current is applied, the current limit is 100mArms when the IC supply power is off. Remark: Circuit voltage at GND pin is 0V. Current flowing into the circuit is positive (no sign) and the current flowing out from the circuit is negative (negative sign), unless otherwise noted. Maximum values of rated and specified values are shown in absolute values.

EARTH LEAKAGE CURRENT DETECTOR M 54124L MITSUBISHI <CONTROL / DRIVER IC> TEST CIRCUI T (CMA = 0.1mF, CMB = 0.1mF, RIN = 100W , Diode are equivalent to MD234, unless otherwise noted) 1 2 4 5 7 8 9 10 11 VR IN GND OD MB OS VS IS VS R INVIN C MB MA 2 3 4 5 6 7 8 A 0.4V VMB VR IN GND OD MB OS VS VS R INVIN MA 2 3 4 5 6 871 VMA VMAH VMAL VMA VMB IMBL IMBH VR IN GND OD MB OS VS VMB R INVIN C MA MA 2 3 4 5 6 7 8 A VS IOSH C MB IOSL VR IN GND OD MB OS VS VOS R INVIN C MA MA 2 3 4 5 6 7 8 A VS IODL IODH VR IN GND OD MB OS VS VOD R INVIN C MB MA 2 3 4 5 6 7 8 A VS VR IN GND OD MB OS VS IS VSM R IN C MB MA 2 3 4 5 6 7 8 C MA V VR IN GND OD MB OS VS MA 2 3 4 5 6 87 IIN VINCV IIN IVR VR IN GND OD MB OS VS R IN C MB MA 2 3 4 5 6 7 8 C MA VRCLV VS tMA 1.45V VR IN GND OD MB OS VS VS R IN MA 2 3 4 5 6 87 C MA VIN VIN VMB tCO 1.85V 0.4V VMB 1.45V 0.4V tMB' VOS VR IN GND OD MB OS VS VS R IN C MB MA 2 3 4 5 6 87 C MA VIN *tMB = tMB' -tMA VIN VOS tOS 1.85V VOS VR IN GND OD MB OS VS VS R INVIN C MB MA 2 3 4 5 6 87 C MA VT is the value of VIN at which OS turns on (VOS > 0.4V) as VIN is increased gradually.

EARTH LEAKAGE CURRENT DETECTOR M 54124L MITSUBISHI <CONTROL / DRIVER IC> TYPICAL CHARAC TER ISTIC S Trip voltage vs. ambient temperature Ambient temperature Ta (°C ) -50 0 50 150-25 25 75 100 125 Trip voltage VT (mvrms) MA input detection time vs. ambient temperature Ambient temperature Ta (°C ) -50 0 50 150-25 25 75 100 125 MA input detection time tMA (ms) OS source current vs. ambient temperature Ambient temperature Ta (°C ) -50 -50 -400 0 50 150-25 25 -100 -150 -250 -300 -200 -350 75 100 125 OS source current IOSH (mA) Operating time vs. input voltage Input voltage V I(mVrms ) 1000 1 1035 7 10030 5070 300500 1000 Ta = 25°C 60H Z 700 500 300 100 Operating time tD (ms) OS output pulse width vs. ambient temperature Ambient temperature Ta (°C ) -50 160 0 50 150-25 25 100 120 140 75 100 125 OS output pulse width tSO (ms) MA continuous detection time vs. ambient temperature Ambient temperature Ta (°C ) -50 160 0 50 150-25 25 100 120 140 75 100 125 MA detector on time tCO (ms)

EARTH LEAKAGE CURRENT DETECTOR M 54124L MITSUBISHI <CONTROL / DRIVER IC> APP LICAT IO N EXA M PLE

• A high-speed earth-leakage circuit breaker using the M54124L V R IN GND OD MB OS V S MA M5 4124L R IN 100 W ZCT C MA C MB 0.1 m F 0.1 m F C OS m F C VS m F Power suppl y Load Note 3 MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary) Tel. +81-427-74-7813 Note 3 :