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rev.1.0, sep.16.2 003, page 1 of 10 M54125L earth leakage current detector rej03f0033-0100z rev.1.0 sep.16.2003 description the M54125L is a semiconductor integrated circuit having the functions of an amplifier for use with high-speed ground-fault breakers. features ? satisfies jis c 8371 ? good temperature characteristic of the input sense current (vlkt = 9 mv) ? internal neutral line open-phase (n open) detection function ? few external components ? good stability with respect to noise, surges ? broad operating temperature range (ta = ?20 to 80c) applications ? high-speed ground-fault breakers summary of functions the M54125L is an integrated circuit used in the amplifi cation unit of a high-speed ground-fault breaker, and consists of a differential amplifier, one-shot circuit, output circuit, constant-current circuit, waveform-shaping circuit, and delay circuit. operation is explained below, based on the block diagram, application example, and operating waveforms. block diagram
M54125L rev.1.0, sep.16.2 003, page 2 of 10 pin configuration (top view)
M54125L rev.1.0, sep.16.2 003, page 3 of 10 absolute maximum ratings (unless otherwise noted, ta = ?20 to 80c) symbol quantity conditions rated value unit is power supply voltage mean current over one cycle of the power supply frequency 0 to 6 ma is (so) power supply surge current (note 1) 0 to 12 ma ? v ilk ilk input voltage taking pin vb to be ground potential ?1.8 to +1.8 v v ibl ibl input voltage ?0.3 to 6 v v out out applied voltage with external voltage applied ?0.3 to 4 v pd power consumption 160 mw topr operating temperature ?20 to 80 c tstg storage temperature ?55 to 125 c note 1: the i s(sg) current waveform is as shown below; one surge or less in a given minute is assumed. recommended operating conditions (unless otherwise noted, ta = ?20 to c) rated value symbol quantity min. typ. max. unit vs power supply voltage when out is off 12 v is power supply current mean current over one cycle of the power supply frequency 5.6 ma c mm external capacitor mm 0.22 f c wf external capacitor wf 1 f c td external capacitor td 6.8 f rx external resistor r x 27 k ? note: handling of unused pins when the abno rmal voltage detection function not used: ? pin rx is open ? pin td is shorted to gnd ? pin wf and pin ibl are open are shorted to gnd
M54125L rev.1.0, sep.16.2 003, page 4 of 10 leakage detection function when a leakage current ig o ccurs on the primary side of zct (a zero- phase current transformer), a leakage signal voltage v ilk appears in the secondary-side output, and is input to the ilk input pin, with the bias pin vb as reference. during the half-cycle in which v ilk is negative, in the interval in which the voltage is equal to or below the dc trip voltage v lkt , the capacitor c mm connected to the pin mm is charged. in this case, if the pin mm voltage v mm does not reache the mm positive-direction threshold voltage, when the charging interval ends the capacitor c mm is discharged with a current larger than the charging current. if the pin voltage v mm reaches the mm positive-direction threshold voltage, at this time the output out is "on" (the state in which output current is flowing out), and at the same time a small current is discharged from the capacitor c mm . when v mm falls to the mm negative-direction threshold voltage, the outp ut out is returned to "off" (the state in which output current flows in). that is, the leakage current for which the dead time t mm coincides with the interval during which the amplitude of the input voltage v ilk is equal to or greater than the dc trip voltage v ilk becomes the sense current of the ground-fault breaker. the output out is "on" for the length of time t out , and the output current turns on the thyristor, effectively causing the breaker to operate. abnormal voltage detection function normally, the rectified voltage of an ac power supply with uniform amplitude is voltage-divided and input to the abnormal voltage input pin ibl as the voltage v ibl . in this case, if the neutral line n is interrupted, depending on the load states of the voltage lines a and b, the input voltage v ibl may become a rectified voltage with amplitude alternating between high and low. at this time, the capacitor c wf connected to the pin wf discharges during the interval in which the amplitude of v ibl is equal to or greater than the abnormal voltage trip voltage v blt . (when the discharge interval ends, the charging interval begins.) when the wf pin voltage v wf falls below the wf threshold voltage, the capacitor c td of pin td begins to charge, and after the delay time t td has elapsed, when the td pin voltage v td reaches the td threshold voltage, the output out is turned "on", effectiv ely causing the breaker to operate. when single-shot noise is superposed on the input voltage v ibl causing it to rise above v blt , the original state is restored after approximately time t wf , thus preventing erroneous operation. current flows in this abnormal voltage detection unit to enable operation only when an external resistor r x is connected to pin rx.
M54125L rev.1.0, sep.16.2 003, page 5 of 10 operation waveform diagrams
M54125L rev.1.0, sep.16.2 003, page 6 of 10 electrical characteristics (unless otherwise noted, v cc = 5 v, ta=-20 to 80c) rated value symbol quantity measurement conditions temp- erature min. max. unit test circuit i s1 power supply current 1 vs vs = 12v, ? ilk = 0mv, out : ?off? 0.7 ma 1 i s2 power supply current 2 vs vs = 16v, ? ilk = ?15mv, out : ?on? 1.2 ma 1 v lkt trip voltage ilk and vb vs = 16v, ? v ilk = 60hz 4 9 mvrms 3 i mm+ sink current mm vs = 16v, ? ilk = 0mv v mn = 0.8v 25 170 370 a4 i mm? source current mm vs = 16v, ? ilk = ?15mv v mn = 0.8v 25 ?110 ?250 ms 4 t mm dead time mm vs = 16v 1.7 4 a10 iou+ sink current out vs = 16v, ? ilk = 0mv v mn = 0.2v 150 a5 ?20 ?200 25 ?100 iou? source current out vs = 16v, ? ilk = ?15mv v mn = 0.8v 80 ?70 ? 5 i out output pulse width out vs = 16v 25 100 ms 10 v sm voltage at max. current vs is = 3.5ma, 25 20 26 v 6 i s3 power supply current 3 vs vs = 12v, v ilk : 0mv v ibl = 0v, out :?off? 1ma2 i s4 power supply current 4 vs vs = 12v, v ilk : 0mv v ibl = 0v, out :?on? 1.4 ma 2 v blt trip voltage ibl vs = 16v, 3.7 4.1 v 7 i ibl input current ibl vs = 16v,v ibl = 4.5v 25 0.8 ? 7 i wf+ sink current wf vs = 16v,v ibl = 4.5v, v wf = 0.5v 25 1 ma 8 i wf? source current wf vs = 16v,v ibl = 0v v wf = 0.5v 25 ?22 ?30 ? 8 t wf return time wf vs = 16v, 35 70 ms 11 i td+ sink current td vs = 16v, v ibl = 0v, v td = 0.5v 25 1 ma 9 i td? source current td vs = 16v, v ibl = 4.5v, v td = 0.5v 25 ?22 ?30 ? 9 t dt delay time td vs = 16v, 200 420 ms 12
M54125L rev.1.0, sep.16.2 003, page 7 of 10 application circuit example
M54125L rev.1.0, sep.16.2 003, page 8 of 10 measurement circuits (unless otherwise specified, c mm = 0.22 f, c wf = 1 f, c td =6.8 f, r x = 27 k ? )
M54125L rev.1.0, sep.16.2 003, page 9 of 10
M54125L rev.1.0, sep.16.2 003, page 10 of 10 package dimensions sop10-p-300-1.27 weight(g) ? 0.12 jedec code eiaj package code lead material alloy 42/cu alloy 10p2-c plastic 10pin 300mil sop symbol min nom max a a 2 b c d e h e l l 1 y b 2 dimension in millimeters a 1 i 2 0.05 0.4 0.45 0.55 0.13 0.15 0.2 5.93 6.13 6.33 5.1 5.3 5.5 7.82 8.12 8.42 0.3 0.5 0.7 0.41 0.1 0 10 0.76 7 .62 1. 27 e e 1 10 6 5 1 h e e d e y f a a 2 a 1 l 1 l c detail f e b 2 e 1 i 2 recommended mount pad x z 1 0.525 0.675 0.25 z z z 1 detail g b x m g ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1.27 2.15 1.75 ? ? ? ? ? ? ?
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