december 2011 ? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 ka2803b ? earth leakage detector ka2803b earth leakage detector features ? low power consumption: 5mw, 100v/200v ? built-in voltage regulator ? high-gain differential amplifier ? 0.4ma output current pulse to trigger scrs ? low external part count ? dip & sop packages, high packing density ? high noise immunity, large surge margin ? super temperature characteristic of input sensitivity ? wide operating tem perature range: t a = -25 ? c to +80 ? c ? operation from 12v to 20v input functions ? differential amplifier ? level comparator ? latch circuit description the ka2803b is designed for use in earth leakage circuit interrupters, for operat ion directly off the ac line in breakers. the input of t he differential amplifier is connected to the secondary co il of zct (zero current transformer). the amplifi ed output of differential amplifier is integrated at external capacitor to gain adequate time delay specified in ksc4613. the level comparator generates a hi gh level when earth leakage current is greater t han the fixed level. 8-dip 8-sop ordering information part number operating temperature range package packing method ka2803b -25 to +80c 8-lead, dual inline package (dip) tube ka2803bd -25 to +80c 8-lead, small outline package (sop) tape and reel
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 2 ka2803b ? earth leakage detector block diagram figure 1. block diagram application circuit figure 2. full-wave application circuit figure 3. half-wave application circuit application information (refer to full-wave application circuit in figure 2) figure 2 shows the ka2803b connected in a typical leakage current detector syst em. the power is applied to the v cc terminal (pin 8) directly from the power line. the resistor r s and capacitor c s are chosen so that pin 8 voltage is at least 12v. the value of c s is recommended above 1f. if the leakage current is at the load, it is det ected by the zero current transformer (zct). the output voltage signal of zct is amplified by the differential amplifier of the ka2803b internal circuit and appears as a half-cycle sine wave signal referred to i nput signal at the output of the amplifier. the amplifie r closed-loop gain is fixed about 1000 times with internal feedback resistor to compensate for zero current transformer (zct) variations. the resistor r l should be selected so that the breaker satisfies the r equired sensing current. the protection resistor r p is not usually used when high current is injected at the br eaker; this resistor should be used to protect the earth leakage detector ic (ka2803b). the range of r p is from several hundred ?? to several k ? . capacitor c 1 is for the noise canceller and a standard value of c 1 is 0.047f. capacitor c2 is also a noise canceller capacitance, but it is not usually used. when high noise is present, a 0.047f capacitor may be connected between pins 6 and 7. the amplified signal finally appears at the pin 7 with pulse signal through the internal latch circuit of the ka2803b. this signal drives the gate of the external s cr, which energizes the trip coil, which opens the circuit br eaker. the trip time of the breaker is determined by capacitor c 3 and the mechanism breaker. this c apacitor should be selected under 1f to satisfy the required trip time. the full-wave bridge supplies power to the ka2803b during both the positive and negative half cycles of the line voltage. this allows the hot and neutral lines to be interchanged.
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 3 ka2803b ? earth leakage detector absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the devic e may not function or be operable above the recommended operating c onditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stre sses above the recommended operating conditi ons may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v cc supply voltage 20 v i cc supply current 8 ma p d power dissipation 300 mw t l lead temperature, soldering 10 seconds 260 c t a operation temperat ure range -25 +80 c t stg storage temperature range -65 +150 c electrical characteristics t a = -25c to +80c unless otherwise specified. symbol parameter conditions test circuit min. typ. max. unit s i cc supply current 1 v cc =12v v r =open v i =2v t a = -25c figure 4 580 a t a = +25c 300 400 530 t a = +80c 480 v t trip voltage v cc =16v, v r =2v~2.02v, v i =2 figure 5 14 16 18 mv (ms) note 1 12.5 14.2 17.0 i o(d) differential amplifier current current 1 v cc =16v, v r ~v i =30mv, v od =1.2v figure 7 -12 20 -30 a differential amplifier current current 2 v cc =16v, v od =0.8v,v r , v i short=v p figure 8 17 27 37 i o output current v sc =1.4v, v os =0.8v, v cc =16.0v t a = -25c figure 9 200 400 800 a t a = +25c 200 400 800 t a = +80c 100 300 600 v scon latch-on voltage v cc =16v figure 10 0.7 1.0 1.4 v i scon latch input current v cc =16v figure 11 -13 -7 -1 a i osl output low current v cc =12v, v osl =0.2v figure 12 200 800 1400 a v idc differential input clamp voltage v cc =16v, i idc =100ma figure 13 0.4 1.2 2.0 v v sm maximum current voltage i sm =7ma figure 14 20 24 28 v i s2 supply current 2 v cc =12.0v, v osl =0.6v figure 15 200 400 900 a v soff latch-off supply voltage v os =12.0v figure 16 7 8 9 v v sc =1.8v i idc =100.0ma t on response time v cc =16v, v r -v i =0.3v, 1v ? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 4 ka2803b ? earth leakage detector test circuits figure 4. supply current 1 figure 5. trip voltage figure 6. v pn1 for v p measurement figure 7. differential amplifier output current 1 figure 8. differential amplifier output current 2 figure 9. output current
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 5 ka2803b ? earth leakage detector test circuits (continued) figure 10. latch-on voltage figure 11. latch input current figure 12. output low current figure 13. differential input clamp voltage figure 14. maximum current voltage figure 15. supply current 2 figure 16. latch-off supply voltage figure 17. response time
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 6 ka2803b ? earth leakage detector typical performance characteristics figure 18. supply current figure 19. differential amplifier output current (v r -v i =30mv, v od =1.2v) figure 20. differential amplifier output current (v r , v i =v p , v od =0.8v) figure 21. output current figure 22. output low current figure 23. v cc voltage vs. supply current 1
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 7 ka2803b ? earth leakage detector typical performance characteristics (continued) figure 24. differential amplifier output current 1 figure 25. differential amplifier output figure 26. latch input current figure 27. output low current figure 28. output current figure 29. v cc voltage vs. supply current 2
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 8 ka2803b ? earth leakage detector typical performance characteristics (continued) figure 30. differential input clamp voltage figure 31. latch-off supply voltage figure 32. latch-on input voltage figure 33. maximum supply figure 34. trip and output figure 35. output response time
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 9 ka2803b ? earth leakage detector physical dimensions c 7 typ 7 typ .430 max [10.92] b a .400 .373 [ 10.15 9.46 ] .250.005 [6.350.13] .036 [0.9 typ] .070 .045 [ 1.78 1.14 ] .100 [2.54] .300 [7.62] .060 max [1.52] .310.010 [7.870.25] .130.005 [3.30.13] .210 max [5.33] .140 .125 [ 3.55 3.17 ] .015 min [0.38] .021 .015 [ 0.53 0.37 ] .010 +.005 -.000 [ 0.254 +0.127 -0.000 ] pin #1 pin #1 (.032) [r0.813] (.092) [?2.337] top view option 1 top view option 2 .001[.025] c n08erevg c. does not include mold flash or protrusions. dambar protrusions shall not exceed d. does not include dambar protrusions. b. controling dimensions are in inches a. conforms to jedec registration ms-001, mold flash or protrusions shall not exceed variations ba e. dimensioning and tolerancing notes: reference dimensions are in millimeters .010 inches or 0.25mm. .010 inches or 0.25mm. per asme y14.5m-1994. figure 36. 8-lead, dual inline package (dip) package drawings are provided as a servic e to customers considering fairchild co mponents. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online pack aging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 10 ka2803b ? earth leakage detector physical dimensions 8 0 see detail a notes: unless otherwise specified a) this package conforms to jedec ms-012, variation aa, issue c, b) all dimensions are in millimeters. c) dimensions do not include mold flash or burrs. d) landpattern standard: soic127p600x175-8m. e) drawing filename: m08arev13 land pattern recommendation seating plane c gage plane x 45 detail a scale: 2:1 pin one indicator 4 8 1 b 5 a 5.60 0.65 1.75 1.27 6.20 5.80 3.81 4.00 3.80 5.00 4.80 (0.33) 1.27 0.51 0.33 0.25 0.10 1.75 max 0.25 0.19 0.36 0.50 0.25 r0.10 r0.10 0.90 0.40 (1.04) option a - bevel edge option b - no bevel edge 0.25 cba 0.10 c figure 37. 8-lead, small outline package (sop) package drawings are provided as a servic e to customers considering fairchild co mponents. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online pack aging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2000 fairchild semiconductor corporation www.fairchildsemi.com ka2803b ? rev. 1.0.7 11 ka2803b ? earth leakage detector
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