Foldback Current Limiting Pdf Free > urlin.us/4c651

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McGraw-Hill..Professional…Many.power.supplies.employ.constant.current.limiting.protection;.foldback.goes.one.step.further.by.reducing.the.output.current.limit.linearly.as.output.voltage.decreases..However…it…adds…complexity…to…the…power…supply…and…can…trigger…"lockout"…conditions…with…non-ohmic…devices…that…draw…a…constant…current…independent…of…supply…voltage…(such…as…op-amps)….The..maximum..dissipation..in..the..foldback..design..is..three..times..lower..than..in..the..constant..current..limited..design…Power.dissipation.vs..For..a..simple..current..limit,..safely..handling..the..worst-case..scenario..(a..short..circuit)..would..therefore..require..a..much..larger..heatsink..and..output..transistor..than..would..be..required..under..normal..operating..conditions…P.d.i.s.s.i.p.a.t.i.o.n.i.n.r.e.g.u.l.a.t.o.r.=.(.V.i.n.−.V.o.u.t.)..I.o.u.t.{displaystyle.P{rm.{dissipation,in,regulator}}=(V{rm.{in}}-V{rm.{out}})times.I{rm.{out}}}…Here…Vin…=…12…V,…VOC…=…10…V,…Imax…=…1…A,…ISC=0.17…A….Billings..(1999)…

The…prime…purpose…of…foldback…current…limiting…in…linear…power…supplies…is…to…keep…the…output…transistor…within…its…safe…power…dissipation…limit….^.Keith.H..Foldback..also..significantly..reduces..the..power..dissipation..in..the..load..in..fault..conditions,..which..can..reduce..the..risks..of..fire..and..heat..damage…Switchmode…power…supply…handbook….p.1.113…References[edit]….Foldback.in.switched-mode.power.supplies.is.discouraged.because.of.these.disadvantages,.and.since.the.benefit.of.reducing.the.power.dissipation.does.not.apply…..When.the.load.attempts.to.draw.overcurrent.from.the.supply,.foldback.reduces.both.the.output.voltage.and.current.to.well.below.the.normal.operating.limits..With…a…linear…voltage…regulator,…the…output…voltage…Vout…and…output…current…Iout…are…maintained…by…simply…dissipating…away…the…surplus…of…input…voltage…Vin:….

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