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Mitsubishi
Mitsubishi

M54124L Datasheet

EARTH LEAKAGE CURRENT DETECTOR


M54124L Datasheet Preview


MITSUBISHI <CONTROL / DRIVER IC>
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.
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 – +80°C)
APPLICATION
High-speed earth-leakage circuit breakers
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 (earth-
leakage) exceeds a specified level, a one-shot high pulse is output
to turn on an externally connected thyristor.
PIN CONFIGURATION (TOP VIEW)
Reference voltage
Input
VR 1
IN 2
GND 3
Differential amplifier output OD 4
One shot multivibrator A MA 5
One shot multivibrator B MB →← 6
Output OS 7
VS 8
Outline 8P5
BLOCK DIAGRAM
VR
1
0
Comparator
1
One shot
multivibrator
A
0
Output
circuit
1
One shot
multivibrator
B
0
VCC
VR
1
VR
Reference
voltage
2
IN
Input
3
GND
45
OD MA
Differential One shot
amplifier multivibrator A
output
6
MB
One shot
multivibrator B
7
OS
Output
8
VS
Page 1

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.
MITSUBISHI <CONTROL / DRIVER IC>
M54124L
EARTH LEAKAGE CURRENT DETECTOR
OPERATING WAVEFORM DIAGRAM
Earth leakage signal VIN
IN
VR VR
Comparator H
1 output L
OD
MA 0
One-shot H
A1 output L
MB 0
OS 0
VT(DC)
MA “ON” voltage
VMA MA “OFF” voltage
tMA(3ms)
tCO(65ms) MB “ON” voltage
VMB
tMB(3ms)
tOS(95ms)
MB “OFF” voltage
VOS
tMA : MA input detection time
tCO : MA detector on time
tMB : MB input detection time
tOS : OS output pulse width (MB detector on time)
Note. The values in the parentheses are typical values for reference only.
Page 2

MITSUBISHI <CONTROL / DRIVER IC>
M54124L
EARTH LEAKAGE CURRENT DETECTOR
ABSOLUTE MAXIMUM RATINGS (Ta = -20 – 80°C unless otherwise noted)
Symbol
Parameter
Conditions
Ratings
Unit
IS
IS (SG)
IIN
IIG
VOD
IMA
VOS
Pd
Topr
Tstg
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
(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
8
12
-250 – +250
30
6
4
6
200
-20 80
-55 125
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)
100%
50%
mA
mA
mA
mA
V
mA
V
mW
°C
°C
1µs 40µs
0mA
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 – 80°C 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
Limits
Min. Typ. Max.
12
1
1
0.1
0.1
100
Unit
V
µF
µF
µF
µF
ELECTRICAL CHARACTERISTICS (Ta = -20 – 80°C unless otherwise noted)
Symbol
IS
VT
IODL
IODH
VMAH
VMAL
IMBL
IMBH
IOSL
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
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
IOSH
OS source current
VS = 12V, VIN = -15mA, VOS = 1.6V
VSM
VINC
VRCL
tMA
tCO
tMB
tOS
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
Note: VIN, is the input voltage with VR as reference. VIN is applied to IN through resistor RIN.
Tempera-
ture (°C)
25
25
25
25
25
25
-20
+25
+80
25
25
25
Test
circuit
1
2
3
3
4
4
5
5
6
6
7
9
9
10
10
11
11
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.
Max.
800
9
240
-150
3.4
1.2
240
-150
Unit
µA
mVrms
µA
µA
V
V
µA
µA
µA
µA
30 V
±2.0 V
6.6 V
4.0 ms
100 ms
4.0 ms
150 ms
Page 3
Part Number M54124L
Manufactur Mitsubishi
Description EARTH LEAKAGE CURRENT DETECTOR
Total Page 6 Pages
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