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M54124L
Earth Leakage Current Detector
REJ03F0031-0100Z Rev.1.0 Sep.16.2003
Description
The M54124L is a semiconductor integrated circuit having amplifier functions for high-speed earth leakage breakers.
Features
* * * * * * * * Satisfies JIS C 8371 standards Good temperature characteristic of input sense current High input sensitivity (VT=6.5 mV) Fewer external components, for greater economy Good stability with respect to noise, surges Can be used at both 100 V and 200 V with low power consumption (Pd=5 mW) 8-pin SIP for high mounting density Broad operating temperature range (Ta=-20 to 80C)
Applications
* High-speed earth leakage breaker
Summary of Functions
This integrated circuit is used in the amplification unit of earth leakage breakers, and consists of a differential amplifier, one-shot circuit, output circuit, and constant-voltage circuit. The secondary side of a zero-phase current transformer (ZCT) which detects leakage currents is connected to both inputs of the differential amplifier. The signal amplified by the differential amplifier is integrated by an external capacitor, and after obtaining a time delay satisfying the characteristics of a high-speed earth leakage breaker as stipulated in JIS C 8371, is connected to the input of the oneshot circuit. The one-shot circuit holds its output at "L" level until the input voltage reaches a prescribed level, and when a leakage current above the prescribed level flows, generates an "H" one-shot pulse at the output, to drive a thyristor connected to the output.
Rev.1.0, Sep.16.2003, page 1 of 9
M54124L
Block Diagram
Pin Configuration (Top view)
Rev.1.0, Sep.16.2003, page 2 of 9
M54124L
Explanation of Operation
Operation is explained referring to the block diagram, an application example, and operation waveform diagrams. * When a leakage current Ig occurs on the primary side of ZCT (the zero-phase current transformer), a leakage signal voltage VIN appears in the secondary-side output, and is input to the input pin IN with the reference voltage pin VR as reference. * During the half-cycle when VIN is negative, in the interval in which VIN is below the DC trip voltage VT (DC), the capacitor CMA connected to pin MA is charged. In this case, if the pin voltage VMA does not reach the MA turn-on voltage, when the charging interval ends the capacitor CMA is discharged with a current greater than the charging current. If the pin voltage VMA reaches the MA turn-on voltage, from that moment until VMA reaches the MA turnoff voltage, CMA is discharged with a small current, to obtain the time tCO. * During the interval of this time tCO, a similar operation is performed for the capacitor CMB, as a result of which an output current with pulse width tOS is output from the output pin OS. * That is, the leakage current when the interval during which the amplitude of the input voltage VIN is equal to or greater than the DC trip voltage VT (DC) coincides with the input detection time tMA (= tMB) is the sense current for the earth leakage breaker. * Also, the output current turns on the thyristor, opening an external contact point to cause the breaker to operate.
Operation Waveforms
Rev.1.0, Sep.16.2003, page 3 of 9
M54124L
Absolute Maximum Ratings
(Unless otherwise noted, Ta = -20 to 80C)
Symbol Is IS(SG) IIN IIG VOD IMA VOS Pd Topr Tstg Quantity Power supply voltage Power supply surge current Input current Input pin current OD applied voltage MA input voltage OS applied voltage Power consumption Operating temperature Storage temperature (Note 1) Across IN-VR (Note 2) Across VR-GND, IN-GND When an external voltage is applied When an external voltage is applied When an external voltage is applied Conditions Rated value 8 12 -250 to +250 30 6 4 6 200 -20 to 80 -55 to 125 Unit mA mA mA mA V mA V mW C C
Remarks: When not specified, voltages are expressed taking the circuit GND pin level to be 0 V, and currents are expressed taking the direction of flow into the circuit to be positive (no sign given), and the direction flowing out to be negative (prepended with "-"). Rated values, standard values, and other maximum and minimum values are given as absolute values. Note 1: The IS(SG) current waveform is as indicated on the right; there is one shot or less in one minute.
Recommended Operating Conditions
(unless otherwise noted, Ta = -20 to 80C)
Rated value Symbol Vs CVS COS CMA CMB RIN Quantity Power supply voltage (when output is turned off) VS-GND capacitance OS-GND capacitance MA-GND capacitance MB-GND capacitance IN external resistance 0.1 0.1 100 Min. 12 1 1 Typ. Max. Unit V F F F F
Rev.1.0, Sep.16.2003, page 4 of 9
M54124L
Electrical Characteristics
(unless otherwise noted, Ta = -20 to 80C)
Measurement conditions Symbol IS VT IODL IODH VMAH VMAL IMBL IMBH IOSL IOSH Quantity Power supply current Trip voltage OD sink current OD source current MA turn-on voltage MA turn-off voltage MB sink current MB source current OS sink current OS source current Vs = 12 V, VIN = -15 mV Vs = 16 V 60 Hz sine wave Vs = 16 V, VIN = 0 mV, VOD = 4 V Vs = 16 V, VIN = -15 mV, VOD = 4 V Vs = 16 V, VIN = -15 mV Vs = 16 V, VIN = -15 mV Vs = 16 V, VIN = 0 mV, VMB = 1.6 V Vs = 16 V, VIN = -15 mV, VMB = 1.6 V Vs = 16 V, VIN = 0 mV, VOS = 0.2 V Vs = 12 V, VIN = -15 mV, VOS = 1.6 V Is = 7 mA Vs = Open, IIN = 100 mA Vs = 16 V, IVR = 20 mA Vs = 16 V Vs = 16 V Vs = 16 V -20 +25 +80 25 25 25 25 25 25 25 25 25 Temperature Measurement circuit 1 2 3 3 4 4 5 5 6 6 Rated value Min. Typ. Max. 800 9 240 -150 3.4 1.2 240 -150 Unit A mVrms A A V V A A A A
4 120 -75 2.8 0.8 120 -75 200 -200 -100 -75 20 0.4 4.4 1.7 40 1.7
VSM VINC VRCL tMA tCO tMB tOS
VS voltage at maximum current IN, VR input clamping voltage VR clamping voltage MA input detection time MA continuous detection time MB input detection time
7 9 9 10 10 11
30 0.2 6.6 4.0 100 4.0 150
V V V ms ms ms ms
OS input detection Vs = 16 V 11 60 time Note: VIN is the input voltage relative to VR, and is input to the input pin IN via the resistor RIN.
Rev.1.0, Sep.16.2003, page 5 of 9
M54124L
Measurement Circuits
(unless otherwise noted, CMA = 0.1 F, CMB = 0.1 F, RIN = 100 , and diodes are equivalent to MD234)
Rev.1.0, Sep.16.2003, page 6 of 9
M54124L
Characteristic Curves
Rev.1.0, Sep.16.2003, page 7 of 9
M54124L
Application Circuit Example (High-speed earth leakage breaker using the M54124L)
Rev.1.0, Sep.16.2003, page 8 of 9
M54124L
8P5
JEDEC Code -- Weight(g) 0.73 Lead Material Cu Alloy
Plastic 8pin 340mil SIP
Package Dimensions
EIAJ Package Code SIP8-P-340-2.54
A2
A1
L
A
Rev.1.0, Sep.16.2003, page 9 of 9
D E
1
e b b1 b2
8
E1 c
Symbol
SEATING PLANE
A A1 A2 b b1 b2 c D E E1 e L
Dimension in Millimeters Min Nom Max 8.3 -- -- -- -- 1.2 -- -- 6.4 0.4 0.5 0.6 1.1 1.2 1.5 0.75 0.85 1.15 0.22 0.27 0.34 19.0 19.2 18.8 2.6 2.8 3.0 1.2 1.3 1.1 -- -- 2.54 -- -- 3.0
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