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power supply supgrvlsory c! rcuit/ dual-voltage con! paratqr the mc3424 seriesisa dual-channel super~isory circuit, consist- ing of two uncommitted input comparators, a reference, otdtput comparators, with high current drive ar)d !r}dicator outputs for eac!~ channel. the input comparators feature programmable k)ys~eresis, high common-mode rejection, and wide commoyi-rnode range, capa- ble of comparing at ground potentia! with single-supply operation. separate de/ay pins are provided to increase noise immunity by de[aying atiivation of the outputs. a2.5 v bandgap vo!tage reference is pinned-out for referertci!~g the input comparators, or other exter- nal functions. independent high current drive and indicator ~utputs for each channel can source and sink up to 300 ma and 30 ma respectively, cfd os/ttl compatible digital inputs provide reii;ote .,~,:*~ activation of each chann~l?s outputs. an input enable pir] allows + ~~,+, ?,,,,?+ \ control of the input comparators. ~ :i:;, ~ ,*p aiihougt] this device is intended for power supply supervision,, the ?k~~, pinrled-out refere!]ce, uncommitted ir)put comparators, and ,~?%~~ other features, enable the mc3424 series to be utiiized fo$w~d8 range of applications. i. $::,.,,~!sii:,i e @ pinned-out 2.5 v ref~rence ,,, . ?+?. ~~~..:ya~d @ wide common-mode range ~ >\?. ,c,t. ~ programmable hysteresis +,+};. ~ ,,>.f o -programmable time d@lavs ~,,t. ,? .$? ~i,\\ ? ~~i , @ two 300 rna drive outputs -. ,/ ,., .,,.,, ?$$;::.t ~!~..$j~ o remote activation capability *$!. **\ . \ .:i)) @ wide supplv range: 4.5 v g vcc <.q;.~ . . ? ~;:$:!. ?~:l$.~~s> \ ~, \:;y;>, appll&ations ~t}> .,?:j\ ,.> *, . ..,, ..,,:<,., yi,. ,:+:.l .,,,. ~ @ dual over-voltage ?croivbarf*~&r@ 6&tion @ dual under-voltage supeq?5i~b?$? o over/u rider volt3ge p&qg@~3qfi @ spiit-suppiv supervisi&n ?:$ @ line-los9 sensin~??$*\~*? ~ proportional cont~\~~& @ programm8b~@~~$ eqtitincy switch @ battery ch~&~,2s> j.:.?\\-,\, ?fr . ?.,? . . . . ? if\\. *?.. .* . . . . ? dc power supply + vout under-voltage indication ??? ?-.c - -. mc3424, mc3424a MC3524, MC3524a i mc3324, mc3324a ~ ; p suffix plastic pack.4ge case $48 ceramic paci(age case 620 16 . ?.. .-?? (top view) -? ?j thus document conta!ns in formatte!+t on a nen, producf. spwtficatlons and in format!oo herslc a~e subject to chan~e \vithou! no?ice. ?c motoaow inc 1962 adi-594ri free datasheet http:///
. . .- .-. . . . . .- ?u.~ ?-?- maximum ratings cbtiparator input voltage range ; . -::;- r-emote activation input voltage range drive ouipuy shofi.~izuit currdmt ?t + .?+ indicator output sink. current . reference short-citctijt current . po~ver dissipation an$ thermal charac?efistics . . ceramic package ,. ?~-mqximum power oissipalioh @ ?~~:= 95c ? ?p~ - tbiprmal resistance ju:nction to ai[ roja plasqc package maximum pow~r pisai@ation-@ t~= 76c : .-. pd . . ?fher,mal resismnce..lunctio nto ait , : o,p~rating:junction?temperature . ceramic package ? f? g:?:$ .o~efating.a~b~ent temperstuz.e?ra~~% - -. . . ta --:- storage temperature,rangp . . .,- . . ., . . - t)t electric-al character istl~s ?; {4.5 v ? oc i e_.j~. ????? ?? ? , ; ,,, . low to ~high,[see: note ~ 1 unless otherwise specifi~~~)? (1) tiow = -$5.uc for mc$524, MC3524a thigh = +1250c?for MC3524, ~t~3524a = -~o~c for ~c3~~4, h~c33,24a ., .,. ?? .=. +85d?c foz w3324 tic3324& ..- = 6c for mc3424, mc3424a = +70c for mc3424, mc3424a ,:- ! (2] the input ;ommo,n-mode voltage or?;nput sl~nal;oila~e shbuld not bg allowed to go negative by more than 300 mv, the l,pper f~~nc~!onaiii~,t.of thecom. . . . . . . . .~~n+de .,#&taw+.rwg.&w? tvptc all y-~i~c =?.4 vliits; .ua?w~tigr otiotfl ln~ti<~~ti go. io;4u t.ofis; !fide pendent of vcc, \y!th~ut .dev!ce .dest$uct i on... . ,, ,-, ,, (3) ~he vth(~s~ ) iirnits are approximately 0.5 t~mes the vref iim;ts over the appll~ab~e temperature range + ? ?, ~ . ? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ?(4) the v~h(o~~ i!m?tts ar~ apprixirn;tiiv the vref limits over the applicable temperature range, . . ., . free datasheet http:///
-. . . . . . . . . ..- -- . . . ? electrical characteristics (4.5 v , ..i~$: ;:;:&a. ta= 25c ,- -. . 50 250 .? ??, -?:50 !;. ;g~$~, ~: ?lowto thigh (notel) ? .? ? ?? ,? , -..$?,: -=, . 500 1000 _: . . . . ?mo ? +,$w ~~ comparator input funtitional co?m~on ti;c~? . -?4. 1 vcc-it -- --0:1 mode range (ta = 25c, note 2) vcc- 1~+$ :q.?::_ . . .,,$: ,\l$ . ,..,.. ~ ~>.. ,.,~$, ,x .- , ?:! $?,e ,,..,?~ ,: hysteresis activation voltage ?? ,, , 4?. v?h.( act) :? - ? ?, ,, ,:k.)!:t !,%j,$ :, . 1 , :.>, $+~) ?. \ ?.. v vcc = 15 v; vcl +, vc2+ = v~~; 7a = 25c :\. ,. : . . , %k:+ ;.; ~ ., 1~= lo% : . . , . . . . . ? . . . i ,2 ?, . ~$i+:$> ,,. . .1,2, :. -:,. . 1~ = 90% ?? 14 ?? - a *:: .: ? ?-? ?1:4 hysteresis current ? ~~ .}; -- -16 ~--- 12.5- ..,, :;?* ~~ --- ,.. vcc = 15 v; vcl_, vc2- = 2.5 v; vcl +, vc2+ = vcc; ta = 25c .,. ,, common mode rejection ratio cmrr --s0 .- 72 ~~ power supply rejection ratio , psrr ;. ? 95,?. - -,; @ input enable threshold (pin 16; note 3) . vfir([ej 0.9 input enable current (pin 16] . . . . ., . . . -- ..,, . . . . . . , ,?. ??? f.. -- ---- - ?7? ~~ ;a ., vil(le) = o v lil(le) -!: **+\,;o.5 -~5 _? ?? ?,:0.5: ? ?.,,! !.,:::,,l ; ~2.3 ??? ? vih(le) = 40 v ?. lll+(i~). ? {1 ~ %.05 1.0 ? 0.05 ? .,,. - 1?.0, . enable select 1 threshold }{qltage (~i~ 2} ,., ?. vth~e~,~} ~$:~;:%?? ?.. ..2.25 . . . . . .2..3 - 2.1 ~~~ - ~ 2.25- ;.4 -?v. delay pin voltage (idly = o ma) ?.t) -~ t! v low state ,,,,, ~ol(@lw. ., ,i.$ _ .x ? . .0.2 fi~ - : ; _< . . . .q:2 , ., ;, ~5 -.:: ,.. ,. ,11 high stat~ ???:??:< ? -? ??: - 1. vofi(pk. ?y ,*- , -.. . d,elay pin sourc# cd;~ent .; ?=,,..,. ~, t.rc,[ ~:$o:-. i v: iutput section i drive outp?tcurrent:~w %$6 (ta = 26c) ~ di/dt i - k-w% drive output trans@~~~?@$ection (ta = 25c) ldrv(trans) ? vcc =?0 v to? iq?g;$t &/dt =. 20? v(w;; ..- lndjcato,r,~~*~nsaturation voltage. ~ ln@@&hr;@titput leakage current , ~fgtit~mparate< t hresndd v (note 4) - remote activation threshold voltage ?? vth(ra) remota.activat~on curfent . . . . . ., vil(ra) = o v lll(ra} -,, ,, ?,, vih(ra) = 40 v i..l,hifij. , ~_. -.. propagation delay (vcc = 15 v; ta = 25c) :.?:. > t: - input to drive output tpl~(l,n/d~v), :? ?1~ ?mv:overdritie, cd~y q ?o ~f ??? :- .,. ,. remote aoti~a~iti to drive output ?p-:: fpl~(~a;dr~) ?-? ? 1.4 v overdrive (2.5 v to o v step) .:.. -: . ---- , ~~~ ~~ a :+.? 300 ? 200 30q ,?~ ma v;c;z.o : ??:? vcc-2.5?? vcc-2.o ?.- ? ? v 15 200 - 15 : , -200 na ---- .2.c ? ? ? 2.0 ?: ? ,i/ps? . 1.0 ? ?? ?? ?1.0 -_. (ii 4? -? ???? . . . . . . i . . . . . . . . . ., .fp~ak} .- . . . . ! . . ?-- .-, . .. . . . . ..- 560 800 ?? ~~o?- , 80~ -- -? ?rnv . . . . . ,. ,,. . . . ...< 25 200..? ?:- ?? 25- 200? na . ., ??-? 1.4 1.5 1.1 1 ;4 ? 1.,7 -v . - . . . . . . . . . . .- ,ph -100 -256 ? ,.-[m -25q -70 25~ _ ??;: , .~q 25q ? ,. :... ,, ., free datasheet http:///
. . . . . . ---- ,: . . . vh(~c*), hysteresis actwation vo~tage (v) : i ,.. ..? . . . ..- . . . . -------- . . . ?--- . . . . . . . . . . . . . . . ., ,, figures ? %ysteresis current versus temperature 15.0 r - ? . ~?.? ? { t~ ,. ~ vcc = 49?v~? ~?:- -? ve14.vc2l = z5 v vcl+, vc2+ = vcc ~ zt~:a . -.- ~ ?- ..-, * ~,., . -.. -.: ,... . ---- -- -. . . . . . . . . . . . ~ c . . . % 13.0 .?vcc=j.5v. .,. .? ; u . ~ ? ., .- m ., -, - - .:.. w . . . > .- ,. ? =. ,3 . -- ., , ..- ---- .-. ,,. . . . . 10,0 -55 -25 0 +25 +50 . , . . ,, i ,?. ..- ..-? .w...t,- @ a 4? figure 2 ? hysteresis activation voltage veysus temperature iref, reference output current (ma) ?- #. . . . . ,.. . flgur&6 ? reference short. circuitcurrent vorsus temperature 30 -- - 25 +z-? ??-???. ?-- ~g ~~zo - 0. y g+ uc. g: 1~ ? ? . w? ua ~v. =~, . ~g? i oj t ? ,. -?! ?- _8g 1. 50 . ..? , + ,1 ? ??? o!- ]_ -55 -25 ? ? o 25 50 75 100 125. ta, ambient temperature (c) . . . . . . . . . . . . . . . . . . . . . . . ,, .,,, .,, .-,, ... ,,-, ., ;:, free datasheet http:///
. .,. ,, .,- ... ,. -,-: . ..- . . . . . . .:, ,. .,,,. ,?. . . . . ,. .; ;7 ,!)s~?:;:..:? ,:, ???? ? figure 7 ?? output oemv time versus , dem~ capacitance :?,-? .,,$ ,.. . 106 . . . . . . . . . . . . . . t? . .- -. ?., ?. ?, vc~=15v . .;.. ?c .ta .; 250c . ..<. ~ ? ?,.:?:: g?lo i -.< . ..~ . . ... .?;?. - z . -. .- ?, .; :: ?? ~~ :7:.??:?: f . , ,,. ?... .- ~ 1.0 -.<. . . . / d:. ,. w.. ..: .?. . a ,- 3 .>.. -? *? 0.1 i . 2- ?2.5-e~ly ? j > toly = -a ; . . . . : . . ..- .,. -,?. ,,:? . 0.001 0.0001 0.001 0.01 0.1 1.0 10.0 ,.$fl~y, delay pin :apjcdianje (pf), . . .,.i.,.,- r ?.. ~,. , ,, ,..~?.!t!t f:gure 9-- 9rive output saturation vul?age ?,- wer~~ts uutp.ut peak .c~.~rent-? ..-?., . = ; 5.0 ?? ?-?- - .:? ? ? ?-????--?- - -?- ?: : ~: .; .=:+:,::t=-..i < ,.. : . . . . . . . . . .- ;.<- ~ . .- . . . . . ..- - 5 1 g ., j -. ,+.. ---- . . . . . . . . . . . . . . . ;,.. ~ ~~ --??-. . ,, .: ?~: !+ -_,? ... .,,-- / . . . .- .- .,. . , ,, . . f% > 0.2 ,-- :.. a .-.. . . . . . . - -..,? +*. e- .- - ?-?::?: :?-.:::~c =15 v;.. 2 / ?. ta = 25*c. ?< -i- - -...;:- .-..: .-.-. -.: ----- .! ? >, .; .; .- ,,. ; .*. -.:! ..\\ t.w:,~.:~..- . .,, .,.. . . . . . . . . . . .; 2.500 . . i ,*, \ a vcc..==i!~ v 2 ?-l~flv(pea~ = 200 mfi? 1.0% outv cycle@ 300 hz z a . + 2 2380 .3 - ~~ . \ . . . ,. / . . . . . . . . :. g / = l34a :.. .,, . . ,- -, . . . . . . . . ~ +- . ?... ---- =. > z , -, . . . . ; z2.300e >0 -55 -25 0 +25 +50 +75 +100 +125 ta, ambient temperature (c) ,. .,. -. . . . ?@ . ~l , , , , i i 1 1. 1 i o 5.0 10 15 20 25 30 35 40 vcc, power supply voltage (v) .,. . . . ., 5 free datasheet http:///
figure 13 ?the complete yoltage sense ca pasill~ of the input comparators, .,! , ,., . . f~ > vr&f . ,.. . . . ?- .- ..., ?-. ... : ..-. :- ,?. ? vs > 2b? ,, . . . !.,. ,. .,?. --- ,., ,.. ,. .,:, ., :.-, ,. ,. :-, ,.. ., ,,. j .j w?th or w17hou-f programmable hysteresis. ? . . . . . . . . . . . . . . . . . - -voltage sense (vs.) -- . . ..- . . ,. .,,. :.? ? over ?? .?. . . . . . . . . .-. i vs ? ~~=~h~~ . 4? @ ~ .,, . ., ,. ,. ,, . . . .?.. .,, .+. > +. . ,. ,. . . . . . . . . vref ,. rh = vref ., . . . - . . . .. ??, ,? . . . ,., ., ,:. . . . ..- ?:?, ,,, .-, ,. ..-, 4.-.. .- under -, . -?.:- with hysteresis ? without hysteresi ?~?? ;~. j?_ , . . 1 vt-&f ,,, , -? ?j? . . r -?? .?. i~~h<2@ , = ?? ?? vref - y., i ??? ..,. ,.. ,. ;, . . . . 6 free datasheet http:///
?.? circuit description f ---- . -- ...:-. . ?? . . . . . ..-. . . . . . . ,---- . . . . . . . . . . . . . . . . . . . . . . . . . . r- ??? ?-l .. ngte: p1.~wfgld oui the back page (page 1.6) d.lhls.- sheet as a.referecce w.hil.a. - ra~ding the remainder of this document. the elock diagram will serve as an aid --.+n-studying the~npu.t. conft~uratlons on the pfsvlous page, fhw.clrcui.& dewrlptlgfi, ?? and th,e appli&ations !nfqrmat@nofl. the juhlowing?pag.qs. :,,, :, ~ :: . . . . . . . . . . . . . . . . . . . . . . . . ----- . . . . . . . . . . . . . . . . . . . . . . ..- . . . . . . . . . . . . . . . . . . . ,. ,.. the mc3424 seriesisa high.~ur+e.nt o,wput, dual chan- nel power supply supervisory circbit. basic circuit con- figuration is shown in figure 29. each channel fea~~~res a true differential input comparator with a common-mode range from ground?poiential tovcc -1 .,4 volts, wifil single . . suppiv operation. the inverting inputs of.each input corn- ?. - ~arator (cl-, ?c2?-[have a feedback acfiva~#d 12.5 ~a current sinkfor pragramrning input comparator% )fst~resis. source resistance of the inverting inpufs determines the amount of hysteresis for each input comparator. the hysteresis jeature can be defeated by reducing the invert- ing. input vdlfage of the respective input comparator to less than two diode drops (2?~ ~ 1.1 volts] ?above ?grid? (stie ?- ?-? ~ysferesis activation voltage specification). a complete rnatrixofvarious input comparator conditions is shown in figure 13 on page 6. the digital lnpuf enable (ie) pin provides full ?enable/ disable control of ane. or both of the input c@mpa!ators. acapacii~r (co ly).tiedto these delay pinswills~tablish a predictable delay time (tdly) of the qrivea<~~~$~~~jcator outputs for;the respective channel. the ~~~a~,?~ins are in~ernallv tied to the non-i nvertj,ng inp~~~~~m~put com- parators 1 ?dnd 2, which are referenc~~{k<.%vo its. there- fore, delay <.ime (tdly) is based &~~e$@~nsfam? current l~~~~so?rce) charging the exte~#a~~$dy capacitor (c dly? to 2.5 volts or: +,,, ,,, {! ~ ~ .*$?. -,,%, ,, ? :.,, .! figure 7 provides ~~~~,weiues for a wide range of time qel?ys.. ~._. ;ti 1.$ ti~ecapabiiitv of thq oelav pins is much greater tilan ,,$;2 .$* ty~?ea1200 pa source current, thus ?enabling a input com[~arato~ 1- enable control isallowed if the enable selectl /non-inverting.input (pin 2) is iessjhan 90%, of ?~~~~$g,pt~tively fa,st delay capacitor discharge time. !; ?. j ,wt+}each independent chafinel of the mc3424 series has a :$, the internal 2.5 volts reference (0.9 vref= 2.25 v]. if the . . .?:? ~~~ .,?,.+~.d,e ,~rjve (orv) and indicator, output (lnd) which respectiveiv input?e?nable s@j@ctl?7n on-lnvertifi g?fnp~~t (pin 2) ?is ?~~,~x? ? sou~ce and;sink current s?im?~lta~eouslv. the orlve out- greater than 0.9 vref, comparator 1 is not affected by the,$ ?. ~utsare current -limit ed emitter-followers cadableof logic state of the iflput enable pin and always r~~$ins &ourcing 300maat aturn-on slewrate of2.0a/ps, ideal enabled. .-. . . . ,,,.~,:, \ :;*, .f~r d~iving ?crowbar? scr?s. the ~ndicator outputs are ?~e voltage threshold of the, l~,put ~nable~~~~&$ttl- ?-? --- o.pencollector, npn~ransistofs; -&tiable of sifiking-3g ma compatible, a l~gic level ?1 .? permits nor@&&&o#%ration ,4.> ;*$k,, .%4 ,, of input comparators, as stated ~b~ti&a ts~~:~ forces . . . ,$a:.,\. [c?,, *i the respective delav pin (oly1, ol~~k,$$a low state, independent of thejinput comparat&~s*xxate: ..q , >$:. ++ the sel~tive enabling feature$~fl~~tit ctimparator 1 is directly applicable when the .w~&~xsertes &used as an over- and under -vottage s~p~~:+,,, over-voltag~}~~t~~tion during power supply turn-on, while the?ti~q$&+~yol tagechannel (2)+an be d;sabled dur- ing fhe :@w~* sup?ply tuin-on-ris&,:time to the reg u?lated lev~j;tp?}$~g+@nting fal~e lndi,~.ti~n..o~an upder-voltage cofi~~$~~?m. if it is desired to monitor two? i?nd~endent ~w~~~s for an und~r-voltage conditiofi, both channels ! ,$;., v ~. cap be select ively?disabled until the slqtiest supply reaches its regulateq voltage. separ~te dqlayh~~s(dlyl, 0ly2)4reprovi6ed~ ~reach channel to i~d~.endentlv delay t,he drive and indicator outpufs, thus ~~viding greater input noise immunity. the two oelav pins are essentiality the-eu:putsof fhe respective input comparators, and provide a constant current source of tvpicallv 200 pa$flhqn the non-inverting input voltage is greater than the inverting- tnp~t level .: (vcl+ > vc.1 -; vc,~+ > yc,~-)., _ :. .-. - . . . . . . . . . . . . . @ ?. . . . . . :..:. ?. . . ?? mo-torol?a ,,? . (- -.. . . . . to provide suffic.i.sntj~~ve for leo?s, smalt relays or reguiar shut-down circ-~itry: these current capabilities applvto both channels oper~ting simultaneously, provid- ing device power dissipation iimita are, not exceeded. separate ttl-compatible remote act!vatign in~uts ?? (ra1, ra2) for each channel wiii activate the drive and indicator outputs of th,e respective channel, independent of the input comparator state, when a low logic level is -applied. the active low for remote activation permits latching of the respective outputs by connecting the indicator output, via a < 5.0 k resistor to the remote activation-irtput of the same channel?; a shown in figure 17. latching? will now oc?cur by either: ~~the remote acti. vatton inputs with a shor~duration 10-w iog?ic?level, o; bj the input comp~rators? unlatching of each channel is accomplished wtth a short duration, hi~h logic tevel at the remote activation pin. the mc3424 series has an ;nternai 2.5 v bandgap refer@r,ce capable of sourcing up to 10ma of ioadcurrent for external bias circuits. this reference has?afl accuiacy oj <4.-oyq for the basic debices and ~1 .0% for the a-suffix devica types at 25c. the reference has a tvpical temper- ature coefficient of 30 pp=m/oc for a-suffix devices, i, .,. ,,j 7 free datasheet http:///
,.. , ??- -??_ ????c- crowbar scr considerations referring to figure 14, it can be seen that the crowbar scr, when activated, is subject to a large current surge from theoutput capacitance, co?t, this capacitance consists of the power su,pply;output ca,p3cit6rk, the load?s decoupling capacitors, and in thc,c,~s~, of figyre 14a, the ? ?supply?s input filter capacitori. this s,urgecur.r? nt'isiilus- trated in figure 1,5, and can ce~se s&,r failure o.r de~ra- ~atian by any one, of?thre,e rnectia,nisrns: &~dj, ?b$.o!ute ? peak sljrge, or?12t, the interreiatjons~ jp??of th.6se fafiure methods and the breadth of the applications make speci - ficatio,rr of the scr by the semiconductor, manufacturer di~fi,cqlt. and ,expensiv~. ,therefore, tile. designer must ?e?mpirjcally determine the ?scr and circu?i~?-e lernents -< which resu?it ?in reliable and ?effective ovp operation. howev&r, an und~rstanding of the factors whlcll influence : fhe:~cr?sdil?dt and surgb ca~abilizi~~sir nplifies~h?ist ask. c, ., . . . ?.,di/d? .,?, ,.. as the gate, regian af the scr is.driven on, its .mea ,., .,. .,, ,:, ,.. of.o~nducti~n .takes. a finita amount of time to grow, startirlg asoverysmail region andgradualtyspreading. since the anode current flows through this turned-on gate region, very high current densities can occur in the gate region if high anode currents appear quickiy !@i/dl!. this cap result ilv ,jrnrn~dia~~ destruction of the scr or gradu,al.degradation of its forward blocki~g vo[~age capabilities ?depending on theseverityof the occasion. - . . . ..- ..-. .,, the value of di/dt that an scr can safely h*@~.jis influenced by its coristruction and the cha~.$:~}~(twtlcs of the gate drive signal. ~ center-ga;e-t~~a~;+~~h has more di/dt capability than a corner-g~~-.j$~~:type, and heavily overdriving (3 to 5 tim6s~~~~~@$ scr gate with a fast <1.0 ys rise time sig&$#&&4$! maximize its ? ,< ~ . ~.+,:,, < y:,t, di/dt capability. a typical rnaxi~,u~ number in phase control scrs of less than 5@,a(w?s) rating might be 200 a/ps, assuming a ~~~~$rrent of five times igt ~n?d?,: 1.0 pa rise tirne~~~~@hgdone this, a di/dt prob- lem is seen to still e~#f$~q&designer can aiso decrease ., -t$? the di/dt of the e~$+~t waveform by adding induc- tance in seri,$%~it~:the scr, as shown in figure 16. ? ?of course:: t~~#:%wuc~?s the circuit?s ability to rapidly reduce t~~s~$,~%s voltage and a tradeoff must be made . . . . betw~$n;h~dy voltage ;educt ion-a ~d dijdi.? ~ ~ ~~:i,.y> ?\i*l. ;,:;: figu~e?q 4?-typlcalcrow@#@ ci;cuit .,,., (ilil . . 1 ? i , i ., +1 i i i ~? - ck .,. : ,. .?, . + .-. ,. 4 series da-. ,,---- l ~v-... m ?? ~~-k?. + ?needed if supply not current limited uu1 free datasheet http:///
. ? . ;, -- .,. . . . . . . . . . :,, , ,.. l . . .:-, . . . ,.:, . ,?., ., ,. -?..? 2. surge current if the peak current and/or th~.d~ration o~.~h.e. s.urg%$,~~t~ .- ,, . . . . . ._ ,. ... . --- -. . . . . . . . is excessive, immediate destruction due to device ~~, ? . .. ---- . ..-. . . . - overheating wil[ result. the surge capability of th<~ sgi@ ? crowbar scr ?se1.egt:@n guide ~ ., ,. ., is directly proportional to its die area.. i! tb$$~.?:? imposed by the dc power s+~pi~: ~1$$* $;+* .,$ ~ l , !* . <$ ~+~-.. ,! ;,.,, ,, ,;,, ., ?? .?:,,,.,! * ~. *,:?, figure 16 -??gl#?&ul~%lewerts a= ecting ... ..-.,. . .~g$+~ ~~*.g.e & di/&t ..:, . . . . ..-. ..-. :._ 0-~, ?~.~ i ,. -..., r.& ~ emp~r!cali.y determined ? ?-- device ?-- , lrms ?!f~m paci ., . . . applications information ,, . ;...!-.?. . . . . . ,.. figure 17 ? overvoltage protgctign d#?spli7supplies with delay and ..-. . . . . . latched-fault indication. positive . .- +w? ~+ power supply 1? . . . . . . . . . = -vo fa~lt indicator 4.7 k ?-. . indicator resets , ,1,1 . . .f4c3524, a ?lh overvoltage sense 4 ~ w = 120 ?o ?drvt * ,.. . ..-. f ?~ ,, . :-j negative ?vj? ~ powei supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . free datasheet http:///
.,. . ..-. . . . .-. ,. ... ,-. . ,! !??:. , . . . . . . . . . . . . . . ?:. .,,. $ ., figure 19 ? latching overvoltage sensing circuit <: !?! ?: ?? ;-j.. .?., $ i ).{ ::. wit? !n,termlu~nt au~q a~rm;,,::.,~, f . ? ?} ? :jr.. vln>2.5v . . . . . ,,. . ,,: 1,... .,v~.?f..,., .? !.!.- . . . . . . . . . . . . . !. ?., ,, ..!?, j ,.:; ,? , loojf . ..4.. a. ----- . . . . . . . . . .-, 10 ,, ~-- ,, -$ ,,1 ? .k mallorv illl,:o,,a,ert ~~~~~ ,,:? l.ok . . . ..- . . -.-. .? .- hysteresis.. l.. .90? ? ~ ? ~?: voltage a@ust . . .- . ,:. 3 .- . . %; - . . . . . . ..& ., -._.-:, . . , . . ..; .!. .- .,-* -. ..-},: . . ? . . . . . . . . ._, + pick-up..vcl{aqe range: 19?v to 29 v hystereslh: 2~0,v i-q 70 v? . . . . . . . ..- drop-out voltage = pick-up voltage - . . hvsteresls voltage ,. .,. - . . . . . . . . . . . . . . . . ,_ ..,. ----- . . . . . . . . . . . . . . . . . . . . . . ??. ?--? @ .-. . free datasheet http:///
. . .,, .- figure 21 ? 9,0 v battery charger with zero sense load current . . . . . . -. .. ?- vbat= 9.0 v 2.5k ,.. . . . .,: ri ? chazge clrr6nt l.- . . . . . . . .- - --- 12v & t -4.. 2 cl+ drv~ ..-. . . . . . . . ------ .1 ,., =: ?c3?24?: indi ++c2+oiy2? ?--?grid-?? 8 ?? ?-? - . . . . . 12v v !? . i the 8.8 volt charge reference is derived from vref using corn~@k~i$.:& l\v\ ator 2 as an opamp. thel~l -.. rh product determines the final char~~ 8.8 v -l -_-v-#-h- voltage. keslstor h1 limits the charge current. ,+:?3 $~ battery decay t vcc - vbat 3.0 v .,$ ? ?i.l \ ? :*j1 , ~ lchg=~= ? ??j, ., . . r1 ?? : ?? -. +21 :..?g?- t:j.:;,t.\,\,\*<.\\ t , ,,\:: \*,., ,,:, figur&.~%t#proportional control circuit , . . ---- ----- -- ?- -------- ---- . . . . . . . . . . . . . . ... - -.. . . . . . . . . . , ., ?,, ,.. . #.- . . - -? ,,,. : ~, ., ~-+ . . ? --a+ .,,. . .1 ...,,,,.: , . . . ...?... ;. ,?.*.-. . . . . . . .--, . : . - ..,!-..?- .,, ,., ..:., ., .-,., ,: ?-? :.. : .,,. ,.. , .. -...! :l~.- . . . ..,. , ..,t, ------ .+, . ., . ...>..- . . . . . . --------------- -- . . . . . . . . . . . . . . . . . . . . - - -... .- .- e... . . . . . . . . . . . . . . . ---- . . . . . . . . . . -. ..,.. ------- . . . . . . . . . . . ,. . . ?b ,. ., ~qrp@q,&+ seyiqa~dycfar kyra$,tiet$ inc. - -- - -. , . . ..- ... -- -, >.k.... ,?, 12 ~~~ ,. free datasheet http:///
. . . . ,, .,.. ., . . . . . -. ?? .. .. - . . . . ..-. ,. .,,,,. ,..- ;,. :., : :. :.. .. c,?. .?, , . .? /. ?-,? -.;-?, ? i : ~?.? ??i?i -: ..! . ----- -.. -- .-. . . . ------- . . . flgure23? alterniilng~wo tone generator ? . (european sirenj - . . -. . . ..- ..?. ----- --- ----. , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,, . . . . . . . -? . . . . . . . . . . . . . . . .? . . ., this inforrngtion~a$ be~~c~efuljy checwd ahdis betieyedta be eqtir~j.relia$le. howevef, no fewonmbilityis assbmed for indcc.ura6ib&. motorola resewes the right :o.ma![a chaf)gas to any products herein to improve. rel.iability, f.unctinn or d~sign. motorola does notassume any iiabflity aris)ng out of the application or usa of any product or circuit described herein. no license is conveyed under patent rights in afl y, form. when this document contains information on a naw product, specifications herein are subject to change without notice, . . free datasheet http:///
. . . . !?- f?:?- -. ?.-*. --- . . ,, ,?,. ;-,..., ?.? ..: . . . .- ?----- . ..- . . . ..? . . . . . ., . . . . . . . . . . . . . . . ! figure 25 ? photoflash cqnverter ,, ii . . . . . . . . . . .- , . . . . -. . . ...? ,.. ,6.ov 9 ..- tl: . . . . . ,. .,.- t2: .? . . . 4 b ?? 3.9 k 9 :, ? 1. cl?_ 4 * vref -,. . . . . . 16 ,e mc3q 5 c ~ m? ., 12 . ~a? r > c2+ 30:1 step up .,., . . shutter 20 ~f 500 v ,., ,, ,. 750 frequency indicator on whe~ input signal frequency < f(tri~) 1 f(trip) = 2go0 coly,l. . . . cdly 2 = 100 coly 1 .?. -. . . . . . . . . . . . . . . . . . . . . . . . . . . ..?. ~ free datasheet http:///
figure 27 ? emergency lighting system .? ,;~ ~ip32. - - , ,.::.. r,: jl:, . . . . . . . . . . . ..? . . . . . . . . . . ..:, , :??.:..:-? ,,: . . . . . . l,ok ,, : . . . . -k l..,, . . . 8.5 v 4 b? w ind1 vcc ,o~ t{.h~:? ,r:p -. ..? .- ? ?am --- .. _.. _.. . drv? ,., .,. a ---- .-. . 1? . . 1?- .,. - ,*, *\ + & ,, .,,.,.. . . . & & ,- 28a. ., -. ..:,~.., ,+ 280. ?.. . . . . 28 c. .:. , ,,, . ., ,, .,, - $. . --, . . . . . . . . . . ?... . .-.< all diodes are 1n4001 28 a. fixed positive t.c. j : ?:?~. . . . . . . , 28 b. variable positive or negative t.c. 28 c, variable positive or.negative t, c:.with a!most .ce,nstant ~/,9~tage. . . . . . . . . . -.. . . -. ------ . . . . . . ---- . . . . . . . . . . -?: . . . ..- ?, .,-,?., ?.- ,.: -? ? -?. ?:- -~ ..?. .---. :? ,?. ,...~ ... . free datasheet http:///
t . ..? . . . figure 29 ? MC3524/3424/3324 block diagram l .! ,., . ., -.. . . . . . . . . . ---- . . ?@ . ...?.?.- -------- . . . . . . . . ..- . . . . . . . . . . . . . . . . . . . .- ?h l ., note 5 ,_. ~ ,! i ?7??? , .- ,, . 1, 8,9, and 1s), 5. rounoeo co rnerso~lonal, . . free datasheet http:///
1 ,. t . . ?@ ., . . . , i. ?: ;:?-. .- ,-. ~ ~----- ---- : ,$~y,..~. t. : .,. . . . . ) s*? ,., *>s\,< ?y? *, ,-. . ti. y?.-. . . . .,?$,.!~. ,,, .-..,. . . -_ }, ~,,,!~ .-. - , $ :t$,:..? ? ,. as indicated?;n the note o; page 7, the diagram appea;;@on.~g~~${~~ ,, ia-; ,..-.-, ..\ the data sheet: and rbprinted below, ?&es i nte nd~d%-s a::fold-o~t<.sr~~$to : ?i? ?&simplify coflsultation.of the diagram wh~leteadchg, the text: ln@&,rteritly, ,, . . . page 16 was ~rinted.+a$tandard page,:ather than a fold-ou~:~~~p~dingly, . this diagram is being supplied s~paratelyfor easy c~~rek~i&;~&th the text. : ?!? ?; : . . ..-. . . .: j drive 2 free datasheet http:///

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