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MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR DESCRIPTION
The M54128 is a semiconductor integrated circuit designed for high-speed type earth leakage breakers. This lC includes leakage and abnormal voltage detecting functions.
PIN CONFIGURATION (TOP VIEW)
GND 1
14 VS 13 VCC
FEATURES
q lmprovement of ability against unwanted tripping due to Iightning -surge. * Adopt the two times counting system. * lmprovement of ability against needless action due to lightningimpulse. q lt is a possible that cope with lEC owing to mode change. * Adopt the 1.5 times counting system. q High input impedance : * Filter circuit can be formed with externally attached C/R. * lmprovement of ability against needless action due to high frequency and high harmonics. q High input sensitivity : VT = 6.5mVrms q Abnormal voltage detecting (neutral conductor open-phase protection) function : * Neutral conductor open-phase protection at single-phase threewire system * ln case of no use this function, stop this function and reduction of circuit current, possible. q Low voltage operation : 7 to12V (conventional Mitsubishi lCs : 12 to 20V) q Low current dissipation : * In stand-by condition : 820A typical (Vs = 9V, Ta = 25C) * When SCR is ON : 740A typical (Vs = 9V, Ta = 25C) q Highly stable design : Employment of circuits of which characteristics fluctuations resulting from changes in supply voltage/ambient temperature are small.
IREF 2
M54128FP
VREF 3 ILKI 4 TRC1 5 TRC2 6 PSEL 7
12 PSAV 11 IBLI 10 TTDC 9 OFFC 8 SCRT
Outline 14P2N-A
SCRT 1 OFFC 2 TTDC 3 IBLI 4 PSAV 5 VCC 6
M54128L
VS 7 GND 8 IREF 9
VREF 10 ILKI 11
APPLICATION
Earth leakage breaker
TRC1 12 TRC2 13
RECOMMENDED OPERATING CONDITIONS
Supply voltage range * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * * * * * * * * * * * 7 to12V Operating ambient temperature * * * * * * * * * * * * * * * * * * * * * * * * -20 to +85C
PSEL 14
Outline 14P5A
BLOCK DIAGRAM
VS VCC PSAV IBLI TTDC OFFC SCRT
Abnormal voltage detection
SCR-driver
Power supply circuit
Leakage detection
GND
IREF
VREF
ILKI
TRC1
TRC2
PSEL
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR PIN FUNCTION DESCRIPTION
Pin No. L FP Common
7 6 9 8 5 14 13 2 1 12
Pin name
Function
VS VCC IREF GND PSAV
Power supply Output pin of internal constant-voltage circuit. Connects to capacitor for decoupling. Connects to resistor which sets constant current of each internal circuit. Approx. 1.3V. Grounding When in normal use, connect the pin to VCC pin. When the abnormal voltage detection function is not in use, ground the pin. Circuit current can be reduced. Ground IBLI pin and TTDC pin also.
Leakage detection, abnormal voltage detection, SCR drive circuits 10 3 VREF Input reference level pin of the leakage detection circuit. Approx. 2.7V. 11 4 Another input pin of the leakage detection circuit. ILKI 12 5 Connects to capacitor for integrating output signals of the leakage input signal level discriminator. TRC1 13 6 Connects to condeser for removing noise. TRC2 Logic function switching pin used when detecting leakage. When the pin is grounded, SCRT operates with the logic flow of negative input positive input 14 7 PSEL negative input. When it is connected to VCC pin, SCRT operates with the logic flow of negative input positive input. This IC will be restored to the initial condition after the specified period if : leakage input signal does not continue ; abnormal voltage input signal does not continue ; or leakage/abnormal voltage is detected and SCR becomes ON. The pin connects to capacitor for time settinng of this function. Input pin of the abnormal voltage detection circuit. Connects to capacitor for time setting of the abnormal voltage detection circuit. Output pin for drive a SCR.
2
9
OFFC
4 3 1
11 10 8
IBLI TTDC SCRT
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
I/O EQUIVALENT CIRCUIT
VCC VS 200
2.7V VREF 11-stages BAND GAP 1.3V ILKI 150
500
350 6-stages
IREF
External R (130k)
VCC 10A 10A 8 A
2.5V
100 100
TRC1 TRC2
OFFC
TTDC
VCC 800
2.5V 2k IBLI
200k
3k 7-stages SCRT 50k 2k 2k
PSAV
PSEL
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
ABSOLUTE MAXIMUM RATINGS (Ta = 25C, unless otherwise noted)
Symbol IS VS MAX VIL IIL IIG VIBL IIBL Pd Topr Tstg Parameter Source current Max. supply voltage Input voltage Input current Input current Input voltage Input current Power dissipation Operating temperature Storage temperature Conditions Ratings 4 15 -1.4 to +1.4 -5 to +5 10 -0.3 to +4.0 4 200 -20 to 85 -55 to125 Unit mA V V mA mA V mA mW C C
ILKI - VREF ILKI - VREF VREF - GND IBLI - GND IBLI - GND
TYPICAL CHARACTERISTICS
Thermal derating
250
Power dissipation Pd (mW)
200
150
100
50
0 0
25
50
75
100
125
150
Ambient temperature Ta (C)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
ELECTRICAL CHARACTERISTICS (Ta = 25C, unless otherwise noted)
Symbol IS0 IS1 IS2 IS3 IS0' IS1' IS3' - VS max Vion IIH VO VILKI VRCL EIOH VTH ETW1 - EIOH VTH ETW2 - VT - VBLT - - IIBLT VIBLC EIOH VTH ETW4 EIOH VTH ETW3 VOL8 IOHc IOHn IOHh Vsoff Power supply circuit Parameter Source current: In stand-by condition Source current: While detecting leakage Source current: While detecting abnormal voltage Source current: Immediately after driving of SCR Source current: In stand-by condition Source current: While detecting leakage Source current: Immediately after driving of SCR ISO variation with ambient temperature Maximum current voltage Leakage detecting DC input voltage ILKI pin input bias current VREF pin output voltage ILKI-VREF input clamp voltage VREF-GND clamp voltage TRC1 pin "H" output current precision TRC1 threshold voltage TW1 pulse width precision TW1 variation with ambient temperature TRC2 pin "H" output current precision TRC2 threshold voltage TW2 pulse width precision TW2 variation with ambient temperature Total leakage detecting AC voltage VT variation with ambient temperature Abnormal voltage detecting voltage VBLT variation with supply voltage VBLT variation with ambient temperature IBLI pin input bias current IBLI-GND clamp voltage TTDC pin "H" output current precision TTDC threshold voltage Delay time pulse width precision OFFC pin "H" output current precision OFFC threshold voltage Reset timer pulse width precision SCRT pin "L" output voltage SCRT pin "H" output current IOH holding supply voltage Abnormal voltage detecting circuit VS Test conditions Min. 570 570 570 520 520 520 520 - - - - - - - -20 - -15 - -20 - -15 - - - - 2.2 - - - - -20 - -30 -20 - -30 - -200 -100 -70 - Limits Typ. 820 840 810 740 740 760 740 -0.07 13.9 7.5 2 2.7 1.2 4.6 - 2.4 - -0.06 - 2.4 - -0.06 6.5 -4.0 -4.0 2.4 0.01 0.06 120 7.2 - 2.4 - - 2.4 - 0.1 -260 -220 -180 3.0 Unit Max. 950 A 950 A 950 A 870 A 870 A 870 A 870 A - %/C 15 V - mVdc 15 nA - V - V - V 20 % - V 15 % - %/C 20 % - V 15 % - %/C - mVrms - % - % 2.6 V - %/V - %/C 300 nA - V 20 % - V 30 % 20 % - V 30 % 0.2 V A - - A - A 4.5 V
9V PSAV = VCC
9V PSAV = GND 9V Ta = -20 to 85C - IS = 4mA ILKI -VREF VIN = VREF 9V IILKI = 3mA IRCL = 5mA VO = 0V : IOH = -10.4A 9V C = 0.01F : TW1 = 2.3ms Ta = -20 to 85C VO = 0V : IOH = -10.4A
1ms circuit
2ms circuit
Leakage detection circuit
9V
C = 0.0047F : TW2 = 1.1ms Ta = -20 to 85C 9V 60Hz Ta = 25 85C 9V Ta = 25 -20C 9V - Ta = -20 to 85C 9V VIN = VREF IIN = 1mA VO = 0V : IOH = -8A C = 1.0F : TW4 = 300ms VO = 0V : IOH = -10A
Reset circuit
9V
9V C = 0.33F : TW3 = 55ms 9V IOL = 200A Ta = -20C 9V VO = 0.8V Ta = 25C Ta = 85C -
SCR drive circuit
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
EARTH LEAKAGE DETECTION
ILKI input
2.4V TRC1 pin
2.3ms
TRC2 pin
2.4V
2.4V OFFC pin 0.7V 55ms SCR output 55ms SCR output
VWhen PSEL = GND
VWhen PSEL = VCC
ABNORMAL VOLTAGE DETECTION
2.4V IBLI input
2.4V OFFC pin
2.4V TTDC pin
300ms 55ms SCR output
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
PRECAUTIONS FOR APPLICATION
Note that the improvement examples in the following precautions for application of M54128FP/L are merely examples. 1. VS applied voltage (1) ls circuit current (clamp circuit characteristics of the equivalent circuit) is as shown in TYPlCAL CHARACTERISTICS figure 1 on page 9. Attention should be given to the circuit current when designing the power supply circuit.
6. Clamp diode of IBLI input pin As shown in the equivalent circuit, it is made up of series resistor (approx. 2k) and seven stages of forward diode. (1) At high temperatures, the drop in diode VF may decrease the clamp voltage of the pin. If the voltage approaches the reference level of the comparator (2.4V) and current leaks occur, the overvoltage detection level may slightly fluctuate. Form the detection circuit as the figure below. It is recommended that R1, R2 and VZ be set as shown below.
RS VS IC Commercial power supply VZ R2 VZ Input R1 IBLI pin
* R1 + R2 > 200k (2) Use of the lC by rectifying commercial power supply a) As Vz, be sure to use zener diode of 12V or less (not exceeding the absolute maximum rating of 15V). b) At high temperatures, clamp voltage decreases and ls increases. lncrease of ls will be restricted at Rs, however. (3) lf normal DC power supply is used, use the lC at Vs=7to10V. 2. Resistor of IREF pin (R = 130k) Reference constant current source of the lC (for restraining fluctuations in supply voltage characteristics and ambient temperature characteristics). Since this resistor determines the characteristics of each circuit, use of high-precision resistor (2%) is recommended. 3. Layout of printed circuit board External noise (noise simulator etc.) may cause faulty operation of the lC. To improve the noise immunity, layout the printed circuit board so that the wiring of the external C and R is made as short as possible. Special attention should be given to the wiring of the condensers connected to Vs, Vcc and SCRT pins. 4. Be careful that the voltage of SCRT output pin does not become lower than the GND level. 5. Change in sensitivity due to insulation deterioration If the insulation of ZCT input pin from the high voltage part might deteriorate, improvement might be expected by connecting a resistor of about R=100k between VREF pin and GND. It should be noted that the circuit current will increase at I = 2.7V/R (approx.). * R1 x R2 < 7k R1 + R2
(2) During excessive input, as shown above, setting should be made so that the input pin voltage becomes 4.3V or lower (to prevent the saturated comparator circuit from operating). * VZ = 4.0V
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
7. Reset time in reset circuit This circuit is designed as a timer circuit of VL = 0.7V, VH = 2.5V and lo = 10A. When SCR is ON, the power supply route of the leakage detection and abnormal voltage detection circuits are shut off, VL does not drop to 0.7V as shown below and therefore reset time may become shorter. Set the reset time somewhat longer in advance.
- VL) T = C x (VH = 0.33F x (2.4 - 0.7) = 55ms I 10A
3.1V
2.4V OFFC pin waveform 0.7V 55ms
* ln the case of leakage detection : May become 10ms (50Hz) shorter * ln the case of abnormal voltage detection : May become 20ms (50Hz) shorter
SCRT pin waveform
0V Note. t : time shorter than setting value t = 10 - 20ms
8. Application of leakage detection function to time delay function As shown in the figure below, by applying the neutral conductor open-phase protection function, it is possible to provide the leakage detection function with time delay function (several 100ms). ln this case, however, the neutraI conductor openphase protection function disappears. Pin No. in parentheses are of L type.
VCC
PSAV
IBLI
TTDC TRC1 TRC2
VCC
PSAV
IBLI
TTDC TRC1 TRC2
(Example 1)
(Example 2)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
TYPICAL CHARACTERISTICS
Source Current vs. Supply Voltage
4 When standing by 85C 3 900 1000 Ta = 25C
Source Current vs. Supply Voltage
Source current (mA)
Source current (A)
25C
When detecting leakage
2 -20C
800
When standing by
When SCR ON 700
1
0 0 5 10 15
600 6 8 10 12
Supply voltage (V)
Supply voltage (V)
Source Current vs. Ambient Temperature
1000 VS = 9V When standing by 900
Source Current vs. Ambient Temperature
1000 VS = 9V When detecting leakage 900
Source current (A)
Source current (A)
800
800
700
700
600 -50
0
50
100
600 -50
0
50
100
Ambient temperature (C)
Ambient temperature (C)
Source Current vs. Ambient Temperature
1000 VS = 9V When detecting abnormal voltage 900
Source Current vs. Ambient Temperature
1000 VS = 9V When SCR ON 900
Source current (A)
800
Source current (A)
0 50 100
800
700
700
600 -50
600 -50
0
50
100
Ambient temperature (C)
Ambient temperature (C)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
IREF Output Voltage vs. Supply Voltage
1.5 Ta = 25C
IREF Output Voltage vs. Ambient Temperature
1.5 VS = 9V
IREF output voltage (V)
IREF output voltage (V)
1.4
1.4
1.3
1.3
1.2
1.2
1.1 6 8 10 12
1.1 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
VREF Output Voltage vs. Supply Voltage
2.9 Ta = 25C
VREF Output Voltage vs. Ambient Temperature
2.9 VS = 9V
VREF output voltage (V)
2.7
VREF output voltage (V)
6 8 10 12
2.8
2.8
2.7
2.6
2.6
2.5
2.5 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
VCC Output Voltage vs. Supply Voltage
6.0 Ta = 25C
VCC Output Voltage vs. Ambient Temperature
6.0 VS = 9V
VCC output voltage (V)
5.0
VCC output voltage (V)
5.5
5.5
5.0
4.5
4.5
4.0 6 8 10 12
4.0 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
TRC1,2 "H" Output Current vs. Supply Voltage
12 Ta = 25C
TRC1,2 "H" Output Current vs. Ambient Temperature
12 VS = 9V
IRC1,2 "H" output current (A)
TRC1,2 "H" output current (A)
11
11
10
10
9
9
8 6 8 10 12
8 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
TRC1,2/OFFC/IBLI/TTDC Threshold Voltage vs. Supply Voltage
3.0 Ta = 25C 3.0
TRC1,2/OFFC/IBLI/TTDC Threshold Voltage vs. Ambient Temperature
VS = 9V
Threshold voltage (V)
Threshold voltage (V)
2.5
2.5
2.0 6 8 10 12
2.0 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
TRC1 Pulse Width vs. Supply Voltage
Ta = 25C TRC1 = 0.01F
TRC1 Pulse Width vs. Ambient Temperature
VS = 9V TRC1 = 0.01F
TRC1 pulse width (ms)
TRC1 pulse width (ms)
3
3
2
2
6
8
10
12
-50
0
50
100
Supply voltage (V)
Ambient temperature (C)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
Total Leakage Detection AC Voltage vs. Supply Voltage Total leakage detection AC voltage (mVrms) Total leakage detection AC voltage (mVrms)
8 Ta = 25C TRC1 = 0.01F fin = 60Hz 7 8
Total Leakage Detection AC Voltage vs. Ambient Temperature
VS = 9V TRC1 = 0.01F fin = 60Hz 7
6
6
5
5
4 6 8 10 12
4 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
TTDC "H" Output Current vs. Supply Voltage
10 Ta = 25C
TTDC "H" Output Current vs. Ambient Temperature
10 VS = 9V
TTDC "H" output current (A)
TTDC "H" output current (A)
9
9
8
8
7
7
6 6 8 10 12
6 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
TTDC Pulse Width vs. Supply Voltage
350 Ta = 25C TTDC = 1.0F
TTDC Pulse Width vs. Ambient Temperature
350 VS = 9V TTDC = 1.0F
TTDC pulse width (ms)
300
TTDC pulse width (ms)
300
250 6 8 10 12
250 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
OFFC "H" Output Current vs. Supply Voltage
12 Ta = 25C
OFFC "H" Output Current vs. Ambient Temperature
12 VS = 9V
OFFC "H" output current (A)
11
OFFC "H" output current (A)
6 8 10 12
11
10
10
9
9
8
8 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
OFFC "L" Output Voltage vs. Supply Voltage
1.2 Ta = 25C
OFFC "L" Output Voltage vs. Ambient Temperature
1.2 VS = 9V
1.0
OFFC "L" output voltage (V)
6 8 10 12
OFFC "L" output voltage (V)
1.0
0.8
0.8
0.6
0.6
0.4
0.4 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
OFFC Pulse Width vs. Supply Voltage
80 Ta = 25C OFFC = 0.33F
OFFC Pulse Width vs. Ambient Temperature
80 VS = 9V OFFC = 0.33F
OFFC pulse width (ms)
60
OFFC pulse width (ms)
6 8 10 12
70
70
60
50
50
40
40 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
SCRT "L" Output Voltage vs. "L" Output Current
0.4 VS = 9V Ta = 25C
SCRT "L" output voltage (V)
0.3
0.2
0.1
0
0
200
400
600
800
1000
1200
"L" output current (A)
SCRT "L" Output Voltage vs. "L" Supply Voltage
0.4 Ta = 25C IOL = 200A
SCRT "L" Output Voltage vs. Ambient Temperature
0.4 VS = 9V IOL = 200A
SCRT "L" output voltage (V)
0.3
SCRT "L" output voltage (V)
0.3
0.2
0.2
0.1
0.1
0
6
8
10
12
0 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
SCRT "H" Output Current vs. Supply Voltage
400 Ta = 25C
SCRT "H" Output Current vs. Ambient Temperature
400 VS = 9V
SCRT "H" output current (A)
300
SCRT "H" output current (A)
0 2 4 6 8 10 12
300
200
200
100
100
0
0 -50
0
50
100
Supply voltage (V)
Ambient temperature (C)
MITSUBISHI
M54128L/FP
EARTH LEAKAGE CURRENT DETECTOR
APPLICATION EXAMPLE
T. Coil AC-LINE
SCR
VS
VCC PSAV
IBLI
TTDC
OFFC
SCRT
Abnormal voltage detection Power supply circuit
SCR driving
M54128L/FP
Earth leakage detection PSEL GND IREF VREF ILKI TRC1 TRC2
Note
Z C T VAn implementation example, which should be fully examined.
Note : MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary) Tel. +81-427-74-7813

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