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MITSUBISHI
M54124L
EARTH LEAKAGE CURRENT DETECTOR
DESCRIPTION
The M54124L is a semiconductor integrated circuit consisting of an amplifier for a high-speed earth-leakage circuit breaker.
PIN CONFIGURATION (TOP VIEW)
FEATURES
q Satisfies JIS C 8371 q Temperature-stable input current threshold q High-input sensitivity (VT = 6.5mV) q Low external component count q Highly resistant to noise and power surges q Low power dissipation (Pd = 5mW typ) q Can be used at 100V and 200V q High-density mounting eight-pin SIL package q Wide operating temperature range (Ta = -20 - +80C)
Reference voltage Input VR 1 IN 2 GND Differential amplifier output One shot multivibrator A One shot multivibrator B Output 3
M54124L
OD 4 MA 5
MB 6
OS 7 VS 8
APPLICATION
High-speed earth-leakage circuit breakers
Outline 8P5
FUNCTION
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 (earthleakage) exceeds a specified level, a one-shot high pulse is output to turn on an externally connected thyristor.
BLOCK DIAGRAM
VCC Output circuit VR
VR Regulator 7 OS Output
1 0
One shot multivibrator A
1
One shot multivibrator B
1
0 Comparator
0
1 2 VR IN Reference Input voltage
3 GND
4 5 OD MA Differential One shot amplifier multivibrator A output
6 MB One shot multivibrator B
8 VS
MITSUBISHI
M54124L
EARTH LEAKAGE CURRENT DETECTOR
OPERATION
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 CMA connected to pin MA charges until VIN 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 VMA reaches the MA 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 CMB, 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.
OPERATING WAVEFORM DIAGRAM
Earth leakage signal VIN
IN VR VR VT(DC) Comparator 1 output OD VMA MA One-shot A1 output 0 H L tMA (3ms) H L MA "ON" voltage MA "OFF" voltage
tCO (65ms) VMB
MB "ON" voltage MB "OFF" voltage VOS
MB OS
0 0 tMB (3ms)
tOS (95ms) tMA tCO tMB tOS : MA input detection time : MA detector on time : MB input detection time : OS output pulse width (MB detector on time)
Note. The values in the parentheses are typical values for reference only.
MITSUBISHI
M54124L
EARTH LEAKAGE CURRENT DETECTOR
ABSOLUTE MAXIMUM RATINGS (Ta = -20 - 80C unless otherwise noted)
Symbol IS IS (SG) IIN IIG VOD IMA VOS Pd Topr Tstg Parameter Supply voltage Supply surge current Input current Input pin current OD applied voltage MA input current OS applied voltage Power dissipation Operating temperature Storage temperature
100% 50% 0mA 1s 40s
Conditions
Ratings 8 12 -250 - +250 30 6 4 6 200 -20 - 80 -55 - 125
Unit mA mA mA mA V mA V mW C C
(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
Note 1: The surge waveform IS(SG)
The waveform of surge current IS(SG) is shown on the left. It is applied less than once per minute.
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.
RECOMMENDED OPERATING CONDITIONS (Ta = -20 - 80C unless otherwise noted)
Symbol VS CVS COS CMA CMB RIN Parameter Supply voltage when output is OFF Capacitance between VS and GND Capacitance between OS and GND Capacitance between MA and GND Capacitance between MB and GND External resistor at IN Min. 12 1 1 0.1 0.1 100 Limits Typ. Max. Unit V F F F F
ELECTRICAL CHARACTERISTICS (Ta = -20 - 80C unless otherwise noted)
Symbol IS VT IODL IODH VMAH VMAL IMBL IMBH IOSL IOSH VSM VINC VRCL tMA tCO tMB tOS Parameter Supply current Trip voltage OD sink current OD source current MA "ON" voltage 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 Test conditions VS = 12V, VIN = -15mV VS = 16V, VIN: 60Hz sine wave VS = 16V, VIN = 0mV, VOD = 4V VS = 16V, VIN = -15mV, VOD = 4V VS = 16V, VIN = -15mA VS = 16V, VIN = -15mA 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 IS = 7mA VS : open, IIN = 100mA VS = 16V, IVR = 20mA VS = 16V VS = 16V VS = 16V VS = 16V
Temperature (C) Test circuit
Min. 4 120 -75 2.8 0.8 120 -75 200 -200 -100 -75 20 0.4 4.4 1.7 40 1.7 60
Limits Typ.
25 25 25 25 25 25 -20 +25 +80 25 25 25
1 2 3 3 4 4 5 5 6 6 7 9 9 10 10 11 11
Max. 800 9 240 -150 3.4 1.2 240 -150
Unit A mVrms A A V V A A A A
30 2.0 6.6 4.0 100 4.0 150
V V V ms ms ms ms
Note: VIN, is the input voltage with VR as reference. VIN is applied to IN through resistor RIN.
MITSUBISHI
M54124L
EARTH LEAKAGE CURRENT DETECTOR
TEST CIRCUIT (CMA = 0.1F, CMB = 0.1F, RIN = 100, Diode are equivalent to MD234, unless otherwise noted)
1 2 3
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 VIN RIN CMB IS A VS VIN
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 RIN CMA CMB VS VOS VIN
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 RIN CMB VS A VOD IODL IODH
VT is the value of VIN at which OS turns on (VOS > 0.4V) as VIN is increased gradually.
4
5
6
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 VIN RIN VS VMA VMB VMAH
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 VIN RIN CMA VS A VMB IMBL IMBH VIN
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 RIN CMA CMB VS A VOS IOSL IOSH
VMA VMB
VMAL
0.4V
7
8
9
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 RIN CMA CMB
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 RIN CMA CMB VS
IS
V VSM
V VINC IIN IIN
IVR
V VRCL
10
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 RIN VIN VIN CMA VS VMB 1.85V 1.45V VMB tMA tCO 0.4V
11
VR IN GND OD MA MB OS VS 1 2 3 4 5 6 7 8 RIN VIN tMB = tMB' -tMA VIN 1.85V 1.45V 0.4V tOS tMB' CMA CMB VS VOS
VOS
MITSUBISHI
M54124L
EARTH LEAKAGE CURRENT DETECTOR
TYPICAL CHARACTERISTICS
Trip voltage vs. ambient temperature
16 14 8
MA input detection time vs. ambient temperature
MA input detection time tMA (ms)
100 125 150
7 6 5 4 3 2 1 0 -50
Trip voltage VT (mvrms)
12 10 8 6 4 2 0 -50
-25
0
25
50
75
-25
0
25
50
75
100 125 150
Ambient temperature Ta (C)
Ambient temperature Ta (C)
MA continuous detection time vs. ambient temperature
160 160
OS output pulse width vs. ambient temperature
MA detector on time tCO (ms)
140 120 100 80 60 40 20 0 -50
OS output pulse width tSO (ms)
-25 0 25 50 75 100 125 150
140 120 100 80 60 40 20 0 -50
-25
0
25
50
75
100 125 150
Ambient temperature Ta (C)
Ambient temperature Ta (C)
OS source current vs. ambient temperature
-400 1000 700 500 300
Operating time vs. input voltage
Ta = 25C 60HZ
OS source current IOSH (A)
-350 -300 -250 -200 -150 -100 -50 0 -50
Operating time tD (ms)
100 70 50 30 10 7 5 3 1
-25
0
25
50
75
100 125 150
1
3 5 7 10
30 50 100 70
500 1000 300
Ambient temperature Ta (C)
Input voltage VI (mVrms)
MITSUBISHI
M54124L
EARTH LEAKAGE CURRENT DETECTOR
APPLICATION EXAMPLE
* A high-speed earth-leakage circuit breaker using the M54124L
M54124L
VR 1 IN 2 GND 3 RIN 100 CMA 0.1F CMB 0.1F OD 4 MA 5 MB 6 OS 7 VS 8
Power supply
CVS 1F
Note 3 ZCT
COS 1F Load
Note 3 : MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary) Tel. +81-427-74-7813

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