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MITSUBISHI
M54122L
EARTH LEAKAGE CURRENT DETECTOR
DESCRIPTION
The M54122L is a semiconductor integrated circuit with amplifier for a high-speed earth leakage circuit breaker.
PIN CONFIGURATION (TOP VIEW)
FEATURES
q Suitable for JIS C 8371 q Good temperature characteristics of input sensitivity current q High input sensitivity (VT = 13.5mV Typ.) q Low external component count q High noise and surge-proof q Low power dissipation (Pd = 5mW Typ.) and may be used both as 100V and 200V. q High mounting density by SIL package with 8 pins q Wide temperature range (Ta = -20 - +80C)
Reference voltage Input
VR IN GND
1 2 3 4 5 6 7 8 REG
LATCH
AMP
Differential amplifier output Latch input Terminal for noise absorption Output
OD SC NR OS VS
APPLICATION
High speed earth leakage circuit breaker
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
VS 8 Reference voltage generation circuit
Latch circuit
AMP
7
OS output
GND 3
1 VR Reference voltage
2 IN Input
4 OD Differential amplifier output
5 SC Latch input
6 NR Terminal for noise absorption
BIAS
MITSUBISHI
M54122L
EARTH LEAKAGE CURRENT DETECTOR
ABSOLUTE MAXIMUM RATINGS (Ta = -20 - 80C unless otherwise noted)
Symbol IS IVR Parameter Supply current VR terminal current 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) Conditions Ratings 8 250 30 -250 250 30 -250 5 200 -20 - 80 -55 - 125 Unit mA mA
IIN ISC Pd Topr Tstg
IN terminal current SC terminal current Power dissipation Operating temperature Storage temperature
mA mA mW C C
Note 1: Current value between VR and IN, and between IN and VR 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 - 80C 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 1 1 Limits Typ. Max. Unit V F F
ELECTRICAL CHARACTERISTICS (Ta = -20 - 80C unless otherwise noted)
Symbol Parameter Test conditions
Temperature(C) Test circuit
Min.
Limits Typ. 400
IS1 VT ITD1 ITD2
Supply current Trip voltage Timed current 1 Timed current 2
VS = 12V, VR-VI = 30mV VS = 16V, VR-VI (Note 2) VS = 16V, VR-VI = 30mV VOD = 1.2V VS = 16V, short circuit between VR and VI, VOD = 0.8V IS1 = 580A VSC = 1.4V IS1 = 530A VOS = 0.8V IS1 = 480A VS = 16V VS = 12V VS = 12V, VOSL = 0.2V VS = 12V, IIC = 20mA IIDC = 100mA ISM = 7mA VR-VI VOS = 0.6V (Note 5)
-20 25 80
-20 - +80
1 1 1 2 3 4 5 5 5 6 7 8 9 10 11 12 13 14
10 -12 17 -200 -100 -75 0.7 200 4.3 0.4 20
13.5
Max. 580 530 480 17 -30 37
Unit A mVrms A A A
25 25 -20 25 80 25 25
-20 - +80 -20 - +80 -20 - +80
IO VSC "ON" ISC "ON" IOSL VIC VIDC VSM IS2 VS "OFF" TON
Output current 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) Latch circuit off-state supply voltage (Note 6) Operating time (Note 7)
1.4 5 6.7 2 28 900
25
-20 - +80
V A A V V V A V
25 VS = 16V, VR-VI = 0.3V 25
0.5 2 4
ms
Note : Typical values are at Ta = 25C. 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 0.047F between OD and GND.
MITSUBISHI
M54122L
EARTH LEAKAGE CURRENT DETECTOR
TEST CIRCUIT
1 2 3
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8
VR IN GND OD SC NR OS VS IS VS 0.047 F
Vrms
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8 VS
1
2
3
4
5
6
7
8 VS
100 VI
Open 0.047 F
100 1k VI
Open 0.047 VOS F
0.047 F
100 0.047 F VI
ITD1 VOD
Open 0.047 F 0.047 F
4
5
6
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8 VS
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8
VR IN GND OD SC NR OS VS IS
1 2 3 4 5 6 7 8 VS
100 VI VOD ITD2
Open Open 0.047 F 0.047 F
Open 3k
Open
IO VOS 0.047 F
100 VI
Open 0.047 F
Open 3k VOS VSC
"ON" 0.047 F
VSC 0.047 F
0.047 F
7
8
9
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8 VS
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8 VS
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8 VS
100 VI
Open
Open VOS
0.047 F
100 0.047 F VI
Open
Open IOSL VOSL 0.047 F IIC 0.047 F
100 VIC
Open
Open 0.047 F 0.047 F
ISC "ON"
10
11
12
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8
Open IIDC VIDC
100 VI
Open
Open 0.047 F
ISM VSM
0.047 F
100 VI
Open
VOS IS2 0.047 F
0.047 0.047 IGT F F
13
14
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8 VS
"OFF"
VR IN GND OD SC NR OS VS
1 2 3 4 5 6 7 8 VS
100 VI
Open
100 VI
Open 0.047 0.047 F F 0.047 F
0.047 0.047 VOS 0.047 F F F
Note: The unit of resistance is ohm. Please insurt 0.01F between pin 1 and pin 3 in test.
MITSUBISHI
M54122L
EARTH LEAKAGE CURRENT DETECTOR
TYPICAL CHARACTERISTICS
VCC voltage vs. supply voltage
12 Ta = -25C 25C 8 75C 6 4 2 0 8 10 12 14 16 18 20 700
Supply current 1 vs. supply voltage
Supply current 1 IS1 (A)
10
600 500 Ta = -25C 400 300 200 100 0 5 10 15 20 25 30 25C 75C
VCC voltage VCC (V)
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.
Supply voltage VS (V)
Reference voltage vs. supply voltage
2.5 Ta = 75C 1000 900 800
Bias current vs. ambient temperature
Reference voltage VR (V)
2.0
Bias current IIN (nA)
25C -25C
700 600 500 400 300 200 100
1.5
1.0
0.5
0 0 4 8 12 16 20
0 -40
-20
0
20
40
60
80
100
Supply voltage VS (V)
Ambient temperature Ta (C)
Differential amplifier output voltage vs. differential input voltage Differential amplifier output voltage VOD (V)
5 -50
Timed current 1 vs. ambient temperature
Timed current 1 ITD1 (A)
4
-40
3
-30
2 Ta = 75C 1 25C 0 10 12 14 16 18 20 -25C
-20
-10
0 -40
-20
0
20
40
60
80
100
Differential input voltage VI = VR - VIN (mV)
Ambient temperature Ta (C)
MITSUBISHI
M54122L
EARTH LEAKAGE CURRENT DETECTOR
OS voltage vs. SC voltage
8 4.5
Operating time vs. ambient temperature
Operating time TON (ms)
1.8
4
OS voltage VOS (V)
6
Ta = 75C
25C
-25C
3.5
4
3
2
2.5
0 0.4
0.6
0.8
1
1.2
1.4
1.6
2 -50
-25
0
25
50
75
100
SC voltage VSC (V)
Ambient temperature Ta (C)
Output current vs. OS output voltage
-400 Ta = -25C 20
Trip voltage vs. ambient temperature
-300 25C -200 75C
Trip voltage VT (mVrms)
2 3 4 5 6 7
Output current IO (A)
16
12
8
-100
4
0 0 1
0 -50
-25
0
25
50
75
100
OS output voltage VOS (V)
Ambient temperature Ta (C)
MITSUBISHI
M54122L
EARTH LEAKAGE CURRENT DETECTOR
APPLICATION EXAMPLE * HIGH-SPEED LEAKAGE CIRCUIT BREAKER WITH M54122L
Supply voltage circuit Amplifier M54122L Trip coil AC line R2 VS C4 3 GND Output circuit
8
Voltage regulator
Reference voltage generator
AMP
Latch circuit
1 RL AC line
2 RP 100
4
5
6 C3
7
C1 C2 Note 9 ZCT
Note 8 SCR CR2AM CR03AM CR02AM
R1
C5
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
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 1F) and C2 (less than 1F). ZCT and load resistance RL of ZCT are connected between input pin 1 and 2 . In this case protective resistance (RP = 100) 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 0.047F) between pin 6 and pin 7 .
Operating time vs. input voltage
1000 700 500 300
C1 = 0.047F Ta = 25C 60HZ
Operating time tD (ms)
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)

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