MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M54128 is a semiconductor integrated circuit designed for high-speed type earth leakage breakers. This lC includes leakage and abnormal voltage detecting functions. FEATURES 14 VS IREF 2 13 VCC VREF 3 ILKI 4 TRC1 5 M54128FP ● 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. ● lt is a possible that cope with lEC owing to mode change. • Adopt the 1.5 times counting system. ● 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. ● High input sensitivity : VT = 6.5mVrms ● 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. ● Low voltage operation : 7 to12V (conventional Mitsubishi lCs : 12 to 20V) ● Low current dissipation : • In stand-by condition : 820µA typical (Vs = 9V, Ta = 25°C) • When SCR is ON : 740µA typical (Vs = 9V, Ta = 25°C) ● Highly stable design : Employment of circuits of which characteristics fluctuations resulting from changes in supply voltage/ambient temperature are small. GND 1 12 PSAV 11 IBLI 10 TTDC TRC2 6 9 OFFC PSEL 7 8 SCRT Outline 14P2N-A SCRT 1 OFFC 2 TTDC 3 IBLI 4 PSAV 5 VCC VS 7 GND 8 M54128L 6 9 IREF VREF 10 ILKI 11 APPLICATION TRC1 12 Earth leakage breaker TRC2 13 RECOMMENDED OPERATING CONDITIONS PSEL 14 Supply voltage range • • • • • • • • • • • • • • •• • • • • • • • • • • • • • • • • • • • • • • • • • • 7 to12V Operating ambient temperature • • • • • • • • • • • • • • • • • • • • • • • • -20 to +85°C Outline 14P5A BLOCK DIAGRAM VS VCC PSAV IBLI TTDC Abnormal voltage detection OFFC SCRT SCR-driver Power supply circuit Leakage detection GND IREF VREF ILKI TRC1 TRC2 PSEL MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR PIN FUNCTION DESCRIPTION Pin No. L FP Common Pin name 7 14 6 13 9 2 8 1 VS VCC IREF GND 5 12 PSAV Function 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. 2 9 OFFC 4 11 3 10 1 8 IBLI TTDC SCRT 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. MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR I/O EQUIVALENT CIRCUIT VCC VS 200 2.7V 500 VREF ILKI 11-stages 350 150 BAND GAP 1.3V 6-stages IREF External R (130k) VCC 10µA 8 µA 10µA 2.5V 100 100 OFFC TRC1 TTDC TRC2 VCC 800 2.5V 200k 2k IBLI 3k 7-stages SCRT 50k 2k PSAV 2k PSEL MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR ABSOLUTE MAXIMUM RATINGS (Ta = 25°C, unless otherwise noted) Symbol IS VS MAX ∆VIL IIL IIG VIBL IIBL Pd Topr Tstg Parameter Conditions Source current Max. supply voltage Input voltage Input current Input current Input voltage Input current Power dissipation Operating temperature Storage temperature ILKI - VREF ILKI - VREF VREF - GND IBLI - GND IBLI - GND TYPICAL CHARACTERISTICS Thermal derating Power dissipation Pd (mW) 250 200 150 100 50 0 0 25 50 75 100 125 Ambient temperature Ta (°C) 150 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 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR ELECTRICAL CHARACTERISTICS (Ta = 25°C, unless otherwise noted) Leakage detection circuit 2ms circuit 1ms circuit IS0 IS1 IS2 IS3 IS0' IS1' IS3' – VS max Vion IIH VO VILKI VRCL EIOH VTH ETW1 – EIOH VTH ETW2 – VT Parameter Power supply circuit Symbol 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 VBLT – – IIBLT VIBLC EIOH VTH ETW4 EIOH VTH ETW3 VOL8 IOHc IOHn IOHh Vsoff 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 SCR drive circuit Reset circuit Abnormal voltage detecting circuit – SCRT pin “H” output current IOH holding supply voltage VS Test conditions 9V PSAV = VCC 9V PSAV = GND 9V Ta = -20 to 85°C – IS = 4mA ILKI -VREF VIN = VREF 9V IILKI = ±3mA IRCL = 5mA VO = 0V : IOH = -10.4µA 9V C = 0.01µF : TW1 = 2.3ms Ta = -20 to 85°C VO = 0V : IOH = -10.4µA 9V C = 0.0047µF : TW2 = 1.1ms Ta = -20 to 85°C 9V 60Hz Ta = 25 → 85°C 9V Ta = 25 → -20°C 9V – Ta = -20 to 85°C 9V VIN = VREF IIN = 1mA VO = 0V : IOH = -8µA 9V C = 1.0µF : TW4 = 300ms VO = 0V : IOH = -10µA 9V C = 0.33µF : TW3 = 55ms 9V IOL = 200µA Ta = -20°C 9V VO = 0.8V Ta = 25°C Ta = 85°C – 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 µA 950 µA 950 µA 870 µA 870 µA 870 µA 870 µA – %/°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 µA – – µA – µA 4.5 V MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR EARTH LEAKAGE DETECTION ILKI input 2.4V TRC1 pin 2.3ms 2.4V TRC2 pin 2.4V OFFC pin 0.7V 55ms SCR output ✽When PSEL = GND 55ms SCR output ✽When PSEL = VCC ABNORMAL VOLTAGE DETECTION 2.4V IBLI input 2.4V OFFC pin 2.4V TTDC pin 300ms 55ms SCR output MITSUBISHI <CONTROL / DRIVER IC> 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. 2kΩ) 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 R1 IC Commercial power supply IBLI pin Input VZ R2 VZ • R1 + R2 > 200kΩ (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 = 130kΩ) 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=100kΩ 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 Ω 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 <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR 7. Reset time in reset circuit This circuit is designed as a timer circuit of V L = 0.7V, VH = 2.5V and lo = 10µA. 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. H - VL) T = C x (V = 0.33µF x (2.4 - 0.7) = 55ms I 10µA 3.1V 2.4V OFFC pin waveform 0.7V • ln the case of leakage detection : May become 10ms (50Hz) shorter • ln the case of abnormal voltage detection : May become 20ms (50Hz) shorter 55ms 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 (Example 1) VCC PSAV IBLI TRC2 TTDC TRC1 (Example 2) TRC2 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR TYPICAL CHARACTERISTICS Source Current vs. Supply Voltage Source Current vs. Supply Voltage 4 1000 When standing by Ta = 25°C 85°C 900 25°C Source current (µA) Source current (mA) 3 2 -20°C 1 When detecting leakage 800 When standing by When SCR ON 700 600 0 0 5 10 6 15 8 Supply voltage (V) Source Current vs. Ambient Temperature 1000 1000 VS = 9V When detecting leakage VS = 9V When standing by 900 Source current (µA) 900 Source current (µA) 12 Supply voltage (V) Source Current vs. Ambient Temperature 800 700 600 -50 0 50 800 700 600 -50 100 Ambient temperature (°C) 0 50 100 Ambient temperature (°C) Source Current vs. Ambient Temperature Source Current vs. Ambient Temperature 1000 1000 VS = 9V When SCR ON VS = 9V When detecting abnormal voltage 900 Source current (µA) 900 Source current (µA) 10 800 700 600 -50 0 50 Ambient temperature (°C) 100 800 700 600 -50 0 50 Ambient temperature (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR IREF Output Voltage vs. Ambient Temperature IREF Output Voltage vs. Supply Voltage 1.5 1.5 VS = 9V 1.4 IREF output voltage (V) IREF output voltage (V) Ta = 25°C 1.3 1.2 8 10 1.3 1.2 1.1 -50 1.1 6 1.4 12 Supply voltage (V) 100 VREF Output Voltage vs. Ambient Temperature 2.9 2.9 Ta = 25°C VS = 9V 2.8 VREF output voltage (V) VREF output voltage (V) 50 Ambient temperature (°C) VREF Output Voltage vs. Supply Voltage 2.7 2.6 2.5 8 6 10 2.8 2.7 2.6 2.5 -50 12 Supply voltage (V) 0 50 100 Ambient temperature (°C) VCC Output Voltage vs. Supply Voltage VCC Output Voltage vs. Ambient Temperature 6.0 6.0 Ta = 25°C VS = 9V 5.5 VCC output voltage (V) VCC output voltage (V) 0 5.0 4.5 4.0 6 8 10 Supply voltage (V) 12 5.5 5.0 4.5 4.0 -50 0 50 Ambient temperature (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR TRC1,2 “H” Output Current vs. Supply Voltage TRC1,2 “H” Output Current vs. Ambient Temperature 12 12 VS = 9V TRC1,2 “H” output current (µA) IRC1,2 “H” output current (µA) Ta = 25°C 11 10 9 8 10 10 9 8 -50 8 6 11 12 100 Ambient temperature (°C) TRC1,2/OFFC/IBLI/TTDC Threshold Voltage vs. Supply Voltage TRC1,2/OFFC/IBLI/TTDC Threshold Voltage vs. Ambient Temperature 3.0 VS = 9V Threshold voltage (V) Ta = 25°C Threshold voltage (V) 50 Supply voltage (V) 3.0 2.5 6 8 10 2.5 2.0 -50 2.0 12 50 100 Ambient temperature (°C) TRC1 Pulse Width vs. Supply Voltage TRC1 Pulse Width vs. Ambient Temperature VS = 9V TRC1 = 0.01µF TRC1 pulse width (ms) 3 2 6 0 Supply voltage (V) Ta = 25°C TRC1 = 0.01µF TRC1 pulse width (ms) 0 8 10 Supply voltage (V) 12 3 2 -50 0 50 Ambient temperature (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR Total Leakage Detection AC Voltage vs. Ambient Temperature 8 Ta = 25°C TRC1 = 0.01µF fin = 60Hz 7 6 5 4 8 6 10 12 Total leakage detection AC voltage (mVrms) Total leakage detection AC voltage (mVrms) Total Leakage Detection AC Voltage vs. Supply Voltage 8 VS = 9V TRC1 = 0.01µF fin = 60Hz 7 6 5 4 -50 100 Ambient temperature (°C) TTDC “H” Output Current vs. Supply Voltage TTDC “H” Output Current vs. Ambient Temperature 10 Ta = 25°C VS = 9V TTDC “H” output current (µA) TTDC “H” output current (µA) 50 Supply voltage (V) 10 9 8 7 6 8 10 9 8 7 6 -50 6 12 0 50 100 Supply voltage (V) Ambient temperature (°C) TTDC Pulse Width vs. Supply Voltage TTDC Pulse Width vs. Ambient Temperature 350 350 Ta = 25°C TTDC = 1.0µF VS = 9V TTDC = 1.0µF TTDC pulse width (ms) TTDC pulse width (ms) 0 300 250 6 8 10 Supply voltage (V) 12 300 250 -50 0 50 Ambient temperature (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR OFFC “H” Output Current vs. Supply Voltage OFFC “H” Output Current vs. Ambient Temperature 12 12 VS = 9V OFFC “H” output current (µA) OFFC “H” output current (µA) Ta = 25°C 11 10 9 8 6 8 10 11 10 9 8 -50 12 Supply voltage (V) 1.2 VS = 9V OFFC “L” output voltage (V) OFFC “L” output voltage (V) Ta = 25°C 1.0 0.8 0.6 6 8 10 1.0 0.8 0.6 0.4 -50 12 Supply voltage (V) 0 50 100 Ambient temperature (°C) OFFC Pulse Width vs. Supply Voltage OFFC Pulse Width vs. Ambient Temperature 80 80 Ta = 25°C OFFC = 0.33µF VS = 9V OFFC = 0.33µF 70 OFFC pulse width (ms) OFFC pulse width (ms) 100 OFFC “L” Output Voltage vs. Ambient Temperature 1.2 60 50 40 50 Ambient temperature (°C) OFFC “L” Output Voltage vs. Supply Voltage 0.4 0 6 8 10 Supply voltage (V) 12 70 60 50 40 -50 0 50 Ambient temperature (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR SCRT “L” Output Voltage vs. “L” Output Current 0.4 SCRT “L” output voltage (V) VS = 9V Ta = 25°C 0.3 0.2 0.1 0 0 400 200 600 800 1000 1200 “L” output current (µA) SCRT “L” Output Voltage vs. “L” Supply Voltage SCRT “L” Output Voltage vs. Ambient Temperature 0.4 0.4 VS = 9V IOL = 200µA SCRT “L” output voltage (V) SCRT “L” output voltage (V) Ta = 25°C IOL = 200µA 0.3 0.2 0.1 0 6 8 10 0.3 0.2 0.1 0 -50 12 50 100 Supply voltage (V) Ambient temperature (°C) SCRT “H” Output Current vs. Supply Voltage SCRT “H” Output Current vs. Ambient Temperature 400 400 VS = 9V SCRT “H” output current (µA) Ta = 25°C SCRT “H” output current (µA) 0 300 200 100 0 0 2 4 6 8 Supply voltage (V) 10 12 300 200 100 0 -50 0 50 Ambient temperature (°C) 100 MITSUBISHI <CONTROL / DRIVER IC> M54128L/FP EARTH LEAKAGE CURRENT DETECTOR APPLICATION EXAMPLE T. Coil SCR AC-LINE VS IBLI VCC TTDC OFFC SCRT PSAV Abnormal voltage detection Power supply circuit SCR driving M54128L/FP Earth leakage detection PSEL GND IREF VREF ILKI TRC1 TRC2 Note Z C T ✽An implementation example, which should be fully examined. Note : MZ Core Series by Soryo Denshi Kagaku Co., Ltd (Mitsubishi Subsidiary) Tel. +81-427-74-7813