earth leakage current detector m5 4 1 2 8 l/fp mitsubishi des cri pt i o n the M54128 i s a semiconductor integrated circuit designed f o r high-speed type earth leakage breakers. this lc includes leakage a nd abnormal voltage detecting functions. f e at ures l lmprovement of ability against unwanted tripping due to iightning -surge. adopt the two times counting system. lmprovement of ability against needless action due to lightning- impulse. l lt is a possible that cope with lec owing to mode change. adopt the 1.5 times counting system. l high input impedance : filter circuit can be formed with externally attached c/r. lmprovement o f ability against needless action due t o high frequency and high harmonics. l high input sensitivity : v t = 6.5mvrms l abnormal voltage detecting (neutral conductor open-phase protection) function : neutral conductor op en-phase protection at single-phase three- wire system ln case of no use this function, stop this function and reduction of circuit current, possible. l low voltage operation : 7 to12v (conventional mitsubishi lcs : 12 to 20v) l low current dissipation : in stand-by condition : 820 m a typical (vs = 9v, ta = 25 c) when scr is on : 740 m a typical (vs = 9v, ta = 25 c) l highly stable design : employment of circuits of which characteristics fluctuations resulting from changes in supply voltage/ambient temperature are small. app l i cat i o n earth leakage breaker rec o m m e nde d o pera t i n g c o ndi t i o n s supply voltage range ?? ??? ?? ?? ?? ??? ? ?? ?? ??? ?? ?? ?? ??? ?? ?? ?? ??? 7 to12v operating ambient temperature ?? ?? ?? ?? ??? ?? ?? ?? ??? ?? ?? -20 to +85 c b l oc k d ia gr a m pi n c o n f i g urat i o n ( t o p v i e w ) outline 14p5a 14 11 12 13 1 4 3 2 10 5 9 6 8 7 m5 4128f p 1 4 5 3 2 6 7 8 9 10 11 12 13 14 m5 4128l outline 14p2n-a v s v cc p sav i bli t tdc of f c s crt gnd i ref v ref i lki t rc 1 t rc 2 p sel s crt of f c t tdc i bli p sav v cc v s gnd i ref v ref i lki t rc1 t rc2 p sel v s v cc p sav i bli t tdc off c s crt p sel t rc 2 t rc 1 i lki v ref i ref gnd power suppl y circuit abnormal voltage detection scr-driver leakage detection
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi 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 v cc pin. when the abnormal voltage detection function is not in use, ground the pin. circuit current can be reduced. ground i bli pin and t tdc pin also. input reference level pin of the leakage detection circuit. approx. 2.7v. another input pin of the leakage detection circuit. connects to capacitor for integrating output signals of the leakage input signal level discriminator. connects to condeser for removing noise. logic function switching pin used when detecting leakage. when the pin is grounded, s crt operates with the logic flow of negative input ? positive input ? negative input. w hen it is connected to v cc pin, s crt 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. pi n f unct i o n d escr i p t i o n function common l eakage detection, abnormal voltage detection, scr drive circuits pin no. pin name lf p 1 3 4 5 6 7 8 9 10 11 12 14 13 2 8 10 11 9 7 6 5 4 3 12 1 2 13 14 v s v cc i ref gnd p sav v ref i lki t rc1 t rc2 p sel off c i bli t tdc s crt
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi i / o eq ui val e nt ci rcui t 11-stages v s 200 band gap 1.3v v cc i ref external r ( 130k ) v ref i lki 2.7v 150 500 35 0 6 -stages v cc 2.5v 10 m a 100 off c t rc1 t rc2 10 m a m a t tdc 100 v cc 2.5v i bli 7 -stages 2k 200 k 3k s crt 800 50k 2k p sav p sel 2k 8
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi abs o l ut e m axi m um ra t i ng s (ta = 25 c, unless otherwise noted) s y mbol conditions parameter i s ratings unit source current max. supply voltage input voltage input current input current input voltage input current power dissipation operating temperature storage temperature v s max d v il i il i ig v ibl i ibl p d t opr t st g i lki - v ref i lki - v ref v ref - gnd i bli - gnd i bli - gnd t ypi cal charac t e r i s t i c s 4 15 -1.4 to +1.4 -5 to +5 10 -0.3 to +4.0 4 200 ma v v ma ma ma mw -20 to 85 -55 to125 v c c 250 200 15 0 100 50 0 0 25 50 75 100 125 150 thermal derating power dissipation p d (mw) ambient temperature t a ( c)
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi i s3 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 i so variation with ambient temperature maximum current voltage leakage detecting dc input voltage ilki pin input bias current v ref pin output voltage ilki-v ref input clamp voltage v ref -gnd clamp voltage t rc1 pin ?? output current precision trc1 threshold voltage t w1 pulse width precision t w1 variation with ambient temperature trc2 pin ??output current precision trc2 threshold voltage t w2 pulse width precision t w2 variation with ambient temperature total leakage detecting ac voltage v t variation with ambient temperature abnormal voltage detecting voltage v blt variation with supply voltage v blt variation with ambient temperature ibli pin input bias current ibli- gnd clamp voltage ttdc pin ?? output current precision ttdc threshold voltage delay time pulse width precision offc pin ?? output current precision offc threshold voltage reset timer pulse width precision scrt pin ?? output voltage scrt pin ?? output current i oh holding supply voltage el ect r i cal charact eri s t i cs (ta = 25 c, unless otherwise noted) test conditions parameter power supply circuit l eakage detection circuit 2ms circuit 1m s circuit abnormal voltage detecting circuit reset circuit scr drive circuit symbol i s0 i s1 i s2 i s0 ' i s1 ' i s3 ' v s max v ion i ih v o v ilki v rcl e ioh v th et w1 e ioh v th et w2 v t v blt i iblt v iblc e ioh v th et w4 e ioh v th et w3 v ol8 i ohc i ohn i ohh v soff p sav = v cc p sav = gnd ta = -20 to 85 c i s = 4ma i lki - v ref v in = v ref i ilki = 3ma i rcl = 5ma v o = 0v : i oh = -10.4 m a c = 0.01 m f : t w1 = 2.3ms ta = -20 to 85 c v o = 0v : i oh = -10.4 m a c= 0.0047 m f : t w2 = 1.1ms ta = -20 to 85 c 60hz ta = 25 ? 85 c ta = 25 ? -20 c ta = -20 to 85 c v in = v ref i in = 1ma v o = 0v : i oh = -8 m a c = 1.0 m f : t w4 = 300ms v o = 0v : i oh = -10 m a c = 0.33 m f : t w3 = 55ms i ol = 200 m a v o = 0.8v limits min. typ. max. unit 820 950 570 m a 840 950 570 m a 810 950 570 m a 740 870 520 m a 740 870 520 m a 760 870 520 m a 740 870 520 m a -0.07 ? / c 13.9 15 ? 7.5 mvdc 21 5 ? a 2.7 ? 1.2 ? 4.6 ? ? 0 -20 % 2.4 ? ? 5 -15 % -0.06 ? / c ? 0 -20 % 2.4 ? ? 5 -15 % -0.06 ? / c 6.5 mvrms -4.0 ? -4.0 ? 2.4 2.6 2.2 v 0.01 %/v 0.06 ? / c 120 300 ? a 7.2 ? ? 0 -20 % 2.4 ? ? 0 -30 % ? 0 -20 % 2.4 ? ? 0 -30 % 0.1 0.2 ? -260 -200 m a -220 -100 m a -180 -70 m a 9v 9v 9v 9v 9v 9v 9v 9v 9v 9v 9v 9v 9v 9v ta = -20 c ta = 25 c ta = 85 c 3.0 4.5 v v s
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi ear t h l eakag e d et ect i o n i lki input t rc1 pin t rc2 pin off c pin scr output scr output abno rm al vo l t ag e d e t e c t i o n i bli input off c pin t tdc pin scr output 2.4v 2.3ms 2.4v 2.4v 0.7v 55ms 55ms 2.4v 55ms 300 ms 2.4v 2.4v ] when p sel = gnd ] when p sel = v cc
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi pre caut i o n s f o r a p p l i c a t i o n note that the improvement examples i n the following precautions for application of M54128fp/l are merely examples. 1 . v s a pp l i e d v ol t a ge ( 1 ) l s circuit current (clamp circuit characteristics o f t h e equivalent circuit) i s a s shown i n typlcal charac- teristics figure 1 on page 9. attention should be given to the circuit current when designing the power supply circuit. (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 ) a t high temperatures, clamp voltage decreases and l s 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. r e sisto r o f i r e f p i n ( r = 130 k w ) reference constant curr ent source of the lc (for restraining fluctuations i n 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 . l a y o ut of pr i nt e d c i r c u i t b oa r d external noise (noise simulator etc.) may cause faulty operation of the lc. t o improve the noise immunity, layout the printed circuit board so that the wiring of the external c and r is made as short a s possible. special attention should be given to the wiring of the condensers connected to vs, vcc and s crt pins. 4 . b e c a r e f ul t h a t t h e v o l ta g e of s c r t o u t p ut p i n d oe s n ot b e co m e lo wer t h a n t h e g n d l evel. 5. c h a n g e in s e n s it ivit y d u e t o in su l a t i o n d e t e r i o r at io n if the insulation of zct input pin from the high voltage part might deteriorate, improvement might b e expected b y connecting a resistor of about r=100k w between v ref pin and gnd. i t should b e noted that the circuit current will increase a t i 2.7v/r (approx.). 6. c l am p d io d e o f ib l i in p u t p in as shown in the equivalent circuit, it is made up of series resistor (approx. 2k w ) and seven stages of forward diode. ( 1 ) at high temperatures, the drop in diode v f may decrease the clamp voltage of the pin. if the voltage approaches t h e reference level of the comparator (2.4v) and current leaks occur, the overvoltage detection level may slightly fluctuate. form the detection circuit a s the figure below. i t i s recommended that r 1 , r 2 and v z be set as shown below. ( 2 ) during excessive input, as shown above, setting should b e made s o that the input pin voltage becomes 4.3v o r lower (to prevent the saturated comparator circuit from operating). ?v z 4.0v = ?r 1 + r 2 > 200k w ? w r 1 x r 2 r 1 + r 2 commercial power supply r s v s v z ic i bli pin input r1 r2 v z = < 7k
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi 7. r ese t t im e i n r eset cir c u i t this circuit is designed as a timer circuit of v l = 0.7v, v h = 2.5v and lo = 10 m a. when scr is on, the power supply route of the leakage detection and abnormal voltage detection circuits a r e 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. 8. a p p licat io n o f l e akag e d et ect io n f u n ctio n t o t im e d el ay fu nc t i on as shown in the figure below, by applying the neutral conductor open-phase protection function, i t i s possible t o provide t h e leakage detection function with time delay function (several 100ms). l n this case, however, the neutrai conductor open- phase protection function disappears. pin no. in parentheses are of l type. t = = 55ms 0.33 m f x (2.4 - 0.7) 10 m a c x (v h - v l ) i = note. t : time shorter than setting value ?ln the case of leakage detection : may become 10ms (50hz) shorter ?ln the case of abnormal voltage detection : may become 20ms (50hz) shorter off c pin waveform 0.7v 2.4v 0v s crt pin waveform 55ms t = 10 ? 20ms 3.1v v cc p sav i bli t tdc t rc1 t rc2 v cc p sav i bli t tdc t rc1 t rc2 ( example 2 ) ( example 1 )
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi t ypi cal charac t e r i s t i c s source current vs. supply voltage source current (ma) supply voltage (v) 4 3 2 1 0 0 5 10 15 85 c -20 c 25 c when standing by source current vs. supply voltage source current ( m a) supply voltage (v) 1000 900 800 700 600 6 8 10 12 t a = 25 c when detecting leakage when standing by when scr on source current vs. ambient temperature source current ( m a) ambient temperature ( c) 1000 900 800 700 600 -50 0 50 100 v s = 9v when detecting leakage source current vs. ambient temperature source current ( m a) ambient temperature ( c) 1000 900 800 700 600 -50 0 50 100 v s = 9v when standing by source current vs. ambient temperature source current ( m a) ambient temperature ( c) 1000 900 800 700 600 -50 0 50 100 v s = 9v when detectin g abnormal volta g e source current vs. ambient temperature source current ( m a) ambient temperature ( c) 1000 900 800 700 600 -50 0 50 100 v s = 9v when scr on
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi v ref output voltage vs. ambient temperature i ref output voltage vs. ambient temperature i ref output voltage (v) ambient temperature ( c) 1.5 1.4 1.3 1.2 1.1 -50 0 50 100 v s = 9v v ref output voltage (v) ambient temperature ( c) 2.9 2.8 2.7 2.6 2.5 -50 0 50 100 v s = 9v v cc output voltage vs. ambient temperature v cc output voltage (v) 6.0 5.5 5.0 4.5 4.0 -50 0 50 100 v s = 9v ambient temperature ( c) v cc output voltage vs. supply voltage v cc output voltage (v) 6.0 5.5 5.0 4.5 4.0 6 81 0 1 2 t a = 25 c supply voltage (v) v ref output voltage vs. supply voltage v ref output voltage (v) 2.9 2.8 2.7 2.6 2.5 6 81 0 1 2 t a = 25 c supply voltage (v) i ref output voltage vs. supply voltage i ref output voltage (v) 1.5 1.4 1.3 1.2 1.1 6 81 0 1 2 t a = 25 c supply voltage (v)
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi t rc1,2 /off c /i bli /t tdc threshold voltage vs. ambient temperature t rc1,2 ??output current vs. ambient temperature t rc1,2 ??output current ( m a) ambient temperature ( c) 12 11 10 9 8 -50 0 50 100 v s = 9v t rc1,2 ??output current vs. supply voltage i rc1,2 h?output current ( m a) 12 11 10 9 8 6 81 0 1 2 t a = 25 c supply voltage (v) threshold voltage (v) ambient temperature ( c) 3.0 2.5 2.0 -50 0 50 100 v s = 9v t rc1 pulse width vs. ambient temperature t rc1 pulse width (ms) 3 2 -50 0 50 100 ambient temperature ( c) v s = 9v t rc1 = 0.01 m f t rc1,2 /off c /i bli /t tdc threshold voltage vs. supply voltage threshold voltage (v) 3.0 2.5 2.0 6 81 0 1 2 t a = 25 c supply voltage (v) t rc1 pulse width (ms) 3 2 6 81 0 1 2 supply voltage (v) t a = 25 c t rc1 = 0.01 m f t rc1 pulse width vs. supply voltage
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi total leakage detection ac voltage vs. ambient temperature ambient temperature ( c) 8 7 6 5 4 -50 0 50 100 total leakage detection ac voltage vs. supply voltage total leakage detection ac voltage (mvrms) 8 7 6 5 4 6 81 0 1 2 supply voltage (v) t tdc ??output current vs. ambient temperature t tdc ??output current ( m a) ambient temperature ( c) 10 8 6 -50 0 50 100 v s = 9v t tdc pulse width vs. ambient temperature t tdc pulse width (ms) 300 -50 0 50 100 ambient temperature ( c) v s = 9v t tdc = 1.0 m f t tdc ??output current vs. supply voltage t tdc ??output current ( m a) 10 8 6 6 81 0 1 2 t a = 25 c supply voltage (v) t tdc pulse width (ms) 300 250 6 81 0 1 2 supply voltage (v) t a = 25 c t tdc = 1.0 m f t tdc pulse width vs. supply voltage 9 7 350 t a = 25 c t rc 1 = 0.01 m f f in = 60hz v s = 9v t rc 1 = 0.01 m f f in = 60hz total leakage detection ac voltage (mvrms) 9 7 350 250
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi off c h?output current vs. supply voltage off c h?output current ( m a) supply voltage (v) 12 11 10 9 8 6 8 10 12 t a = 25 c off c l?output voltage vs. supply voltage off c l?output voltage (v) supply voltage (v) 1.2 1.0 0.8 0.6 0.4 6 8 10 12 t a = 25 c off c pulse width vs. supply voltage off c pulse width (ms) supply voltage (v) 80 70 60 50 40 6 8 10 12 t a = 25 c off c = 0.33 m f off c h?output current vs. ambient temperature off c h?output current ( m a) ambient temperature ( c) 12 11 10 9 8 -50 0 50 100 v s = 9v off c l?output voltage vs. ambient temperature off c l?output voltage (v) ambient temperature ( c) 1.2 1.0 0.8 0.6 0.4 -50 0 50 100 v s = 9v off c pulse width vs. ambient temperature off c pulse width (ms) ambient temperature ( c) 80 70 60 50 40 -50 0 50 100 v s = 9v off c = 0.33 m f
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi s crt ??output voltage vs. ??output current s crt ??output voltage (v) ??output current ( m a) 0.4 0.3 0.2 0.1 0 0 200 v s = 9v t a = 25 c 400 600 800 1000 1200 s crt ??output voltage vs. ??supply voltage s crt ??output voltage (v) supply voltage ( v ) 0.4 0.3 0.2 0.1 0 6 t a = 25 c i ol = 200 m a 81 0 1 2 s crt ??output current vs. supply voltage s crt ??output current ( m a) supply voltage ( v ) 400 300 200 100 0 0 t a = 25 c 48 1 2 26 1 0 s crt ??output voltage vs. ambient temperature s crt ??output voltage (v) ambient temperature ( c) 0.4 0.3 0.2 0.1 0 -50 v s = 9v i ol = 200 m a 0 50 100 s crt ??output current vs. ambient temperature s c rt ??output current ( m a) ambient temperature ( c) 400 300 200 100 0 -50 0 50 100 v s = 9v
earth leakage current detector m5 4 1 2 8 l/fp mitsubishi app l i cat i o n exa m p l e ] an implementation example, which should be fully examined. ac-line v s v cc p sav t. coil scr i bli t tdc off c s crt m5 4128l /f p i ref v ref i lki t rc1 t rc2 p sel gnd z c t power suppl y circuit abnormal voltage detection scr driving earth leakage detection mz core series by soryo denshi kagaku co., ltd (mitsubishi subsidiary) tel. +81-427-74-7813 note : note
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