MITSUBISHI <CONTROL / DRIVER IC>
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 (V
T
= 13.5mV Typ.)
q
Low external component count
q
High noise and surge-proof
q
Low power dissipation (P
d
= 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 – +80°C)
Reference voltage
Input
V
R
→
IN
→
GND
1
2
3
4
5
6
7
8
REG
LATCH
AMP
Differential amplifier output
Latch input
Terminal for noise absorption
Output
O
D
←
S
C
→
N
R
→
O
S
←
V
S
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 zero-
current 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
V
S
8
Reference voltage generation circuit
Latch circuit
AMP
7
O
S
output
GND 3
1
V
R
Reference
voltage
2
IN
Input
4
O
D
Differential
amplifier
output
5
S
C
Latch
input
6
N
R
Terminal for
noise absorption
BIAS
MITSUBISHI <CONTROL / DRIVER IC>
M54122L
EARTH LEAKAGE CURRENT DETECTOR
ABSOLUTE MAXIMUM RATINGS
(Ta = -20 – 80°C unless otherwise noted)
Symbol
I
S
I
VR
Parameter
Supply current
V
R
terminal current
Between V
R
-IN (Note 1)
Between V
R
-GND
Between IN-V
R
(Note 1)
Between IN-V
R
(Note 1)
Between IN-GND
Between V
R
-IN (Note 1)
Conditions
Ratings
8
250
30
-250
250
30
-250
5
200
-20
–
80
-55
–
125
Unit
mA
mA
I
IN
I
SC
P
d
T
opr
T
stg
IN terminal current
S
C
terminal current
Power dissipation
Operating temperature
Storage temperature
mA
mA
mW
°C
°C
Note 1: Current value between V
R
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 V
R
and IN pin.
RECOMMENDED OPERATING CONDITIONS
(Ta = -20 – 80°C unless otherwise noted)
Symbol
V
S
C
VS
C
OS
Parameter
Supply voltage when latch circuit is off-state.
External capacitor between V
S
and GND
External capacitor between O
S
and GND
Min.
12
1
1
Limits
Typ.
Max.
Unit
V
µF
µF
ELECTRICAL CHARACTERISTICS
(Ta = -20 – 80°C unless otherwise noted)
Symbol
Parameter
Test conditions
Tempera-
ture(°C)
Test
circuit
Min.
Limits
Typ.
∗
400
I
S1
V
T
I
TD1
I
TD2
Supply current
Trip voltage
Timed current 1
Timed current 2
V
S
= 12V, V
R
-V
I
= 30mV
V
S
= 16V, V
R
-V
I
(Note 2)
V
S
= 16V, V
R
-V
I
= 30mV
V
OD
= 1.2V
V
S
= 16V, short circuit between
V
R
and V
I
, V
OD
= 0.8V
I
S1
= 580µA
V
SC
= 1.4V
I
S1
= 530µA
V
OS
= 0.8V
I
S1
= 480µA
V
S
= 16V
V
S
= 12V
V
S
= 12V, V
OSL
= 0.2V
V
S
= 12V, I
IC
= 20mA
I
IDC
= 100mA
I
SM
= 7mA
V
R
-V
I
V
OS
= 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
µA
mV
rms
µA
µA
µA
25
25
-20
25
80
25
25
-20 – +80
-20 – +80
-20 – +80
I
O
V
SC “ON”
I
SC “ON”
I
OSL
V
IC
V
IDC
V
SM
I
S2
V
S “OFF”
T
ON
Output current
S
C
ON voltage (Note 3)
S
C
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
µA
µA
V
V
V
µA
V
25
V
S
= 16V, V
R
-V
I
= 0.3V
25
0.5
2
4
ms
Note
∗
: Typical values are at Ta = 25°C.
Note 2: When standard value of voltage (60Hz) between V
R
and V
I
is minimum, and output O
S
is low-level, or when standard value of voltage (60Hz) between
V
R
and V
I
is maximum, and output O
S
is high-level, it is considered as a good one.
Note
3: When standard value of voltage V
SC “ON”
is minimum, and output O
S
is low-level, or when standard value of voltage V
SC “ON”
is maximum, and output O
S
is high-level, it is considered as a good one.
Note
4: Supply current 2 is necessary to keep high in output O
S
.
Note
5: After applying 30mV between V
R
and V
I
and shorting between them, it is considered as a good one if standard value of I
GT
flows out of output O
S.
Note
6: After supply voltage applies 12V and output O
S
is high-level, it is considered as a good one in the standard value of supply voltage and in the low-level
of output O
S
.
Note
7: Operating time is a time from applying fixed input till operating latch circuit in 0.047µF between O
D
and GND.
MITSUBISHI <CONTROL / DRIVER IC>
M54122L
EARTH LEAKAGE CURRENT DETECTOR
TEST CIRCUIT
1
2
3
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
R
IN GND O
D
S
C
N
R
O
S
V
S
I
S
V
S
0.047
µF
Vrms
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
S
1
2
3
4
5
6
7
8
V
S
100
V
I
Open
0.047
µF
100
1k
V
I
Open
0.047 V
OS
µF
0.047
µF
100
0.047
µF
V
I
I
TD1
V
OD
Open
0.047
µF
0.047
µF
4
5
6
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
S
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
R
IN GND O
D
S
C
N
R
O
S
V
S
I
S
1
2
3
4
5
6
7
8
V
S
100
V
I
I
TD2
V
OD
Open
Open
0.047
µF
0.047
µF
Open
3k
Open
I
O
V
OS
0.047
µF
100
V
I
Open
0.047
µF
Open
3k V
OS
V
SC
“ON”
0.047
µF
V
SC
0.047
µF
0.047
µF
7
8
9
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
S
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
S
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
S
100
V
I
Open
Open
V
OS
0.047
µF
100
0.047
µF
V
I
Open
Open
I
OSL
V
OSL
0.047
µF
I
IC
0.047
µF
100
V
IC
Open
Open
0.047
µF
0.047
µF
I
SC “ON”
10
11
12
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
Open
I
IDC
V
IDC
100
V
I
Open
Open
0.047
µF
I
SM
V
SM
0.047
µF
100
V
I
Open
V
OS
I
S2
0.047
µF
0.047 0.047 I
GT
µF
µF
13
14
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
S
“OFF”
V
R
IN GND O
D
S
C
N
R
O
S
V
S
1
2
3
4
5
6
7
8
V
S
100
V
I
Open
100
V
I
Open
0.047 0.047
µF
µF
0.047
µF
0.047 0.047 V
OS
0.047
µF
µF
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
V
CC
voltage vs. supply voltage
12
T
a
= -25°C
25°C
8
75°C
6
4
2
0
8
10
12
14
16
18
20
700
Supply current 1 vs. supply voltage
Supply current 1 I
S1
(µA)
10
600
500
T
a
= -25°C
400
300
200
100
0
5
10
15
20
25
30
25°C
75°C
V
CC
voltage V
CC
(V)
Supply voltage V
S
(V)
V
CC
voltage generates by the constant voltage circuit in IC.
This is measured not by M54122L but by a special element.
Supply voltage V
S
(V)
Reference voltage vs. supply voltage
2.5
T
a
= 75°C
1000
900
800
Bias current vs. ambient temperature
Reference voltage V
R
(V)
2.0
Bias current I
IN
(nA)
25°C
-25°C
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 V
S
(V)
Ambient temperature T
a
(°C)
Differential amplifier output voltage
vs. differential input voltage
Differential amplifier output voltage V
OD
(V)
5
-50
Timed current 1 vs. ambient temperature
Timed current 1 I
TD1
(µA)
4
-40
3
-30
2
T
a
= 75°C
1
25°C
0
10
12
14
16
18
20
-25°C
-20
-10
0
-40
-20
0
20
40
60
80
100
Differential input voltage
∆V
I
= V
R –
V
IN
(mV)
Ambient temperature T
a
(°C)
MITSUBISHI <CONTROL / DRIVER IC>
M54122L
EARTH LEAKAGE CURRENT DETECTOR
O
S
voltage vs. S
C
voltage
8
4.5
Operating time vs. ambient temperature
Operating time T
ON
(ms)
1.8
4
O
S
voltage V
OS
(V)
6
T
a
=
75°C
25°C
-25°C
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
S
C
voltage V
SC
(V)
Ambient temperature T
a
(°C)
Output current vs. O
S
output voltage
-400
T
a
= -25°C
20
Trip voltage vs. ambient temperature
-300
25°C
-200
75°C
Trip voltage V
T
(mVrms)
2
3
4
5
6
7
Output current I
O
(µA)
16
12
8
-100
4
0
0
1
0
-50
-25
0
25
50
75
100
O
S
output voltage V
OS
(V)
Ambient temperature T
a
(°C)
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