Mitsubishi M54125P Earth leakage current detector Datasheet

MITSUBISHI <CONTROL / DRIVER IC>
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR
DESCRIPTION
The M54125 is a semiconductor integrated circuit consisting of an
amplifier for high-speed earth leakage circuit breaker.
PIN CONFIGURATION (TOP VIEW)
Capacitor
MM →
← 1
Output OUT ← 2
FEATURES
APPLICATION
High-speed earth-leakage circuit breakers
3
NC
4
Capacitor CTD
← 5
TD →
Capacitor CWF
← 7
WF →
Input
IBL → 8
External resistor
RX → 9
NC
FUNCTION
The M54125 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, current
regulator, waveform regulator and delay circuit. The following
description refers to the block diagram, application example, and
operational waveforms.
GND
Input
6
NC
10
NC
11
VS
12
M54125L
● Satisfies JIS C 8371
● Temperature-stable input current trigger threshold (VLKT = 9mV)
● Capable of detecting a lost phase on the neutral line
● Economical, low external component count
● Highly resistant to noise and power surges
● Wide operating temperature range (Ta = -20 – +80°C)
ILK → 13
VB
Bias voltage
14
Outline 14P5A
ILK → 1
Input
VB
2
← 3
Capacitor MM →
Output OUT ← 4
GND
10
VS
9 ← RX
M54125P
Bias voltage
N.C: no connection
8 ← IBL Input
→ WF Capacitor CWF
7 ←
← TD
6 →
5
Outline 10P2-C
BLOCK DIAGRAM (Note: Pin No. in parentheses are of M54125L)
External
resistor
RX
9
(9)
VS
10
(12)
Input
IBL
8
(8)
Bias
current
source
Capacitor CWF
WF
7
(7)
Capacitor CWF
TD
6
(5)
Waveform
regulator
Delay
circuit
One-shot
multi vibrator
Output
circuit
Comparator
Voltage
regulator
VBLT
VCC
A • VLKT
VB
A
Amplifier
(13)
Comparator
(14)
1
2
ILK
Input
VB
Bias
(1)
M54125L/P
External resistor
(2)
(3)
3
4
5
MM
Capacitor
OUT
Output
GND
Capacitor CTD
MITSUBISHI <CONTROL / DRIVER IC>
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR
ABSOLUTE MAXIMUM RATINGS (Ta = -20 – 80°C unless otherwise noted)
Symbol
Parameter
IS
Supply voltage
IS(SO)
Supply surge current
∆VILK
ILK input voltage
VIBL
VOUT
Pd
Topr
Tstg
IBL input voltage
OUT applied voltage
Power dissipation
Operating temperature
Storage temperature
Conditions
Average supply current frequency
per cycle
(Note 1)
Pin VB serves as the voltage
reference
When external voltage is applied
Ratings
Unit
0–6
mA
0 – 12
mA
-1.8 – +1.8
V
-0.3 – 6
-0.3 – 4
160
-20 – 80
-55 – 125
V
V
mW
°C
°C
Note 1: IS(SG) current waveform, which is given in the following diagram, shall be one shot or less per minute.
12mA
IS(SG)
6mA
0mA
40µS
1µS
RECOMMENDED OPERATING CONDITIONS (Ta = -20 – 80°C unless otherwise noted)
Parameter
Symbol
VS
Supply voltage
IS
Supply current
CMM
CWF
CTD
RX
External capacitor MM
External capacitor WF
External capacitor TD
External resistor RX
When output OUT is OFF
Average power supply current per
cycle
Handling of unused pins when the abnormal voltage detection function is not used
• Pin RX must be left open
• Pin TD must be shorted to GND
• Pin WF and pin IBL may be left open or shorted to GND
Min.
12
Limits
Typ.
Max.
Unit
V
5.6
0.22
1
6.8
27
mA
µF
µF
µF
kΩ
MITSUBISHI <CONTROL / DRIVER IC>
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR
LEAKAGE DETECTION FUNCTION
ABNORMAL VOLTAGE DETECTION FUNCTION
When leakage current current Ig appears on the primary side of
zero-current transformer, ZCT, leakage signal voltage V ILK appears
on the secondary side and is input at ILK with bias VB as the
reference. In the half cycle when VILK is negative, capacitor CMM
connected to MM charges until VILK reaches the DC trip voltage.
If the voltage at MM does not reach the MM positive threshold
voltage, when the charging phase is completed, capacitor CMM
discharges at a small current. The output OUT is reset to the off
state (in which output current flows in) when VMM descends to the
MM negative threshold voltage.
Earth-leakage currents are detected when the amplitude of input
voltage VILK exceeds the DC trip voltage VLKT for longer than the
detection time tMM. The output OUT turns on for time tOUT. The
output current is used to turn on the thyristor that opens the
breaker contacts.
Normally VIBL, fixed amplitude AC supply that has been rectified
and divided by a resistor, is input to abnormal voltage input IBL.
When a fault occurs in the neutral line N, successive peaks of VIBL
become alternately small and large, with the levels determined by
the load on the AC power lines A and B.
When the amplitude of VIBL exceeds the abnormal voltage trip
voltage VBLT, capacitor CWF connected to pin WF discharges. After
the discharge shase is completed, charging begins again.) When
voltage VWF at WF drops below the WF threshold voltage,
capacitor CTD at TD charges, and after delay time tTD, when
voltage VTD at TD reaches the TD threshold voltage, output OUT
turns on, activating the circuit breaker. To avoid misoperation due
to the effect of repeated one-shot noise that brings VIBL above
VBLT, the voltage drops to the initial value only after time tWF.
This abnormal voltage detection circuit is enabled only when an
external resistor RX is connected to pin RX to enable the current
flow.
WAVEFORM DIAGRAM
1) Voltage waveform when earth leakage is detected.
VILK
ILK
VB VB
VLKT
Note: Values in the parentheses are for reference only.
MM positive direction threshold voltage
MM negative direction threshold voltage
VMM
MM
0
IMM
(3ms)
OUT 0
tOUT(45ms)
2) Voltage waveform when abnormal voltage is detected.
VISL
IBL
VBTL(3.9V)
0
VWF
WF
Noise
WF threshold voltage
0
TD threshold voltage
tWF(55ms)
VTD
TD
0
OUT 0
tTD(300ms)
MITSUBISHI <CONTROL / DRIVER IC>
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR
ELECTRICAL CHARACTERISTICS (VCC = 5V and Ta = -20 – 80°C unless otherwise noted)
Symbol
Parameter
Test conditions
Temperature
Pin VS
Pin VS
VS = 12V, ∆VILK = 0mV, Out : “OFF”
VS = 16V, ∆VILK = -15mV, Out : “ON”
Sink current
Source current
Detect inhibit time
Sink current
Pin ILK
and VB
Pin MM
Pin MM
Pin MM
Pin OUT
VS = 16V, VLKT : 60Hz
Test circuit 3
VS = 16V, ∆VILK = 0mV, VMM = 0.8V
VS = 16V, ∆VILK = -15mV, VMM = 0.8V
VS = 16V
VS = 16V, ∆VILK = 0mV, VOUT = 0.2V
25
25
IOU-
Source current
Pin OUT
VS = 16V, ∆VILK = -15mV
VOUT = 0.8V
-20
25
80
tOUT
Output pulse width
Pin OUT
VS = 16V
VSM
Maximum current
voltage
Pin VS
IS = 3.5mA
IS3
Supply current 3
Pin VS
IS4
Supply current 4
VBLT
Trip voltage
IS1
IS2
Supply current 1
Supply current 2
VLKT
Trip voltage
IMM+
IMMtMM
IOU+
Limits
Min.
Max.
0.7
1.2
Unit
mA
mA
4
9
mVrms
170
-110
1.7
150
-200
-100
-70
25
370
-250
4
µA
µA
ms
µA
4
4
10
5
µA
5
100
ms
10
20
26
V
6
VS = 12V, VILK : 0mV
VIBL = 0V, OUT : “OFF”
Test circuit 2
1
mA
Pin VS
VS = 12V, VILK : -15mV
VIBL = 12V, OUT : “ON”
Test circuit 2
1.4
mA
Pin IBL
VS = 16V
4.1
V
0.8
µA
IIBL
Input current
Pin IBL
IWF+
IWFtWF
ITD+
ITDtDT
Sink current
Source current
Recovery time
Sink current
Source current
Delay time
Pin WF
Pin WF
Pin WF
Pin TD
Pin TD
Pin TD
25
3.6
VS = 16V, VIBL = 4.5V
Test circuit 7
VS = 16V, VIBL = 4.5V, VWF = 0.5V
VS = 16V, VIBL = 0V, VWF = 0.5V
VS = 16V
VS = 16V, VIBL = 0V, VTD = 0.5V
VS = 16V, VIBL = 4.5V, VTD = 0.5V
VS = 16V
25
25
25
25
25
1
-22
35
1
-22
200
-30
70
-30
420
APPLICATION EXAMPLE
CWF
AC power input
A N B
CTD
RX
VS
IBL
RX
Bias
current
source
Voltage
regulator
WF
TD
Waveform
regulator
Delay
circuit
One-shot
multivibrator
Output
circuit
Comparator
VBLT
VCC
VB
A • VLKT
A
Amplifier
ILK
VB
Test
circuit
1
1
Comparator
M54125L/P
MM
OUT
GND
CMM
Note 2
ZCT
Note 2 : MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary)
Tel. +81-427-74-7813
A N B
Load
mA
µA
ms
mA
µA
ms
7
8
8
11
9
9
12
MITSUBISHI <CONTROL / DRIVER IC>
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR
TEST CIRCUIT (CMM = 0.22µF, CTD = 6.8µF and RX = 27kΩ unless otherwise noted)
1
2
IS 1 and IS 2 Measurement
IS 3 and IS 4 Measurement
VS
VS
∆VILK
∆VILK
ILK
VB
MD234 or
Equivalent
VS
RX
A
ILK
IS 1, IS 2
CMM
A
VS
VB
RX
RX
IS 3, IS 4
CMM
MM
IBL
MM
IBL
OUT
WF
OUT
WF
GND
TD
GND
TD
CWF
VOUT
VOUT
VIBL
CTD
∗: IS 2 is the value after OUT turns on. (Vout > 0.5V)
3
∗: IS 4 is the value after OUT turns on.
4
VLKT
IMM+ and IMM- Measurement
VS
VS
∆VILK
VIBL
ILK
VS
ILK
VS
VB
RX
VB
RX
MM
IBL
MM
IBL
OUT
WF
GND
TD
CMM
OUT
VOUT
GND
A
IMM+
IMM-
WF
VMM
TD
∗: VLKT is the value of VIBL when OUT turns on as VIBL is
gradually increased.
5
6
IOU+, IOU- Measurement
VSM Measurement
VS
∆VILK
ILK
VS
ILK
VS
VB
RX
VB
RX
IOU+
MM
IBL
MM
IBL
A
OUT
WF
OUT
WF
IOU-
GND
TD
GND
TD
CMM
VOUT
+
VSM V
IS
MITSUBISHI <CONTROL / DRIVER IC>
M54125L/P
EARTH LEAKAGE CURRENT DETECTOR
7
8
VBLT, IIBL Measurement
IWF+, IWF- Measurement
VS
ILK
VS
VB
RX
MM
IBL
OUT
WF
GND
TD
VS
ILK
VS
VB
RX
MM
IBL
OUT
WF
GND
TD
RX
IIBL
A
RX
IWF+
A
IWF-
VIBL
+
V VWF
-
VIBL
VWF
∗: VBLT is the value of VIBL when VF = 0.5V.
9
10
ITD+, ITD- Measurement
VS
tMM, tOUT Measurement
VILK
VS
ILK
VS
VB
RX
MM
IBL
OUT
WF
GND
TD
CMM
ILK
VS
VB
RX
MM
IBL
OUT
WF
ITD+
GND
TD
A
RX
VOUT
VIBL
VTD
ITD-
10ms
VILK
1.8V
1.4V
0.5V
VOUT
tOUT
tMM
11
tWF Measurement
ILK
tTD Measurement
VS
VB
RX
MM
IBL
RX
VIBL
CµF
OUT
12
VS
WF
VS
ILK
VS
VB
RX
MM
IBL
OUT
WF
GND
TD
VIBL
CTD
VTD
TD
VIBL
CµF
0.5V
3kΩ
GND
RX
VOUT
4.5V
4.5V
0V
VTD
0.5V
tWF
VIBL
0V
0.5V
VOUT
tTD
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