HV301/HV311
Functional Description, cont’d.
RAMPVꢂaiVcuppOi VasVpOducOdV tVzOptVeidV hOVvtl egOVtiV hO
RAMPVꢂaiVwallVbOVfaxOd,Vaidace aigV he V hOVcapcua VasVaiVcuppOi Vlama
mtdO.VDOꢂOidaigVtiV hOVveluOVtfV hOVltedVceꢂeca tpVeidV hO
ꢂptgpemmOdVcuppOi Vlama ,VchepgaigVmeyVcti aiuOVftpVstmOV amO,
bu VmeyVit VOxcOOdVeVitmaielV100msVꢂpOsO V amOVlama .VVꢁicOV hO
ltedVceꢂeca tpVhesVbOOiVchepgOd,V hOVtu ꢂu VcuppOi VwallVdptꢂ,
pOducaigV hOVvtl egOVtiV hOVSENSEVꢂai,VwhachVaiV upiVwall
aicpOesOV hOVRAMPVꢂaiVcuppOi ,V husVceusaigV hOVvtl egOVtiV hO
ceꢂeca tpVctiiOc OdV tV hOVRAMPVꢂaiV tVcti aiuOVpasaig,V hOpOby
ꢂptvadaigVyO Veit hOpVꢂptgpemmOdVdOley.VIfVduOV tVtu ꢂu VtvOp-
ltedVctida atisVdupaigVs ep uꢂ,VPWRGDVdtOsVit VechaOvOVei
ec avOVs e OVwa haiV100msVtpV hOVCapcua VBpOekOpVasV paꢂꢂOd,V hO
capcua VasVpOsO ,VꢂullaigVdtwiV hOVGATEV tVꢀ EE,VdaschepgaigV hO
ceꢂeca tpVctiiOc OdV tV hOVRAMPVꢂai,VcheigaigVPWRGDV tVei
aiec avOVs e O.VAV amOtu VtpVcapcua VbpOekOpVfeul VwallVaia ae OVei
Au t-RO pyVafVOieblOd.
ceꢂeca tpVwhach,VaiV upi,VꢂptgpemsVIipushVecctpdaigV t
Iipush=10µA-Clted/C2.
WhOiV hOVpemꢂVvtl egOVasVwa haiV1.2ꢀVtfV hOVpOgule OdVai Opiel
suꢂꢂlyVvtl egO,V hOVcti ptllOpVwallVftpcOV hOVGATEV OpmaielV tVe
itmaielV10ꢀ,V hOVPWRGDVꢂaiVwallVcheigOV tVeiVec avOVs e O,V hO
Capcua VBpOekOpVasVOieblOdVeidV hOVcapcua VwallV peisa atiV tVeVltw
ꢂtwOpVslOOꢂVmtdO.
WhOiV hOVvtl egOVtiV hOVSENSEVꢂaiVpasOsV tV100mꢀ,Vaidace aig
eiVtvOpVcuppOi Vctida ati,V hOVcapcua VbpOekOpVwallV paꢂVaiVlOssV hei
5µs.VThasV amOVmeyVbOVOx OidOdVbyV hOVedda atiVtfVOx Opiel
ctmꢂtiOi s.
A VeiyV amOVdupaigV hOVs ep VuꢂVcyclOVtpV hOpOef Op,VcptssaigV hO
UꢀVeidVꢁꢀVlama sV(aicludaigVhys OpOsas)VwallVceusOVeiVammOdae O
pOsO VtfVellVai OpielVcapcua py.VVWhOiV hOVaiꢂu VsuꢂꢂlyVvtl egO
pO upisV tVeVveluOVwa haiV hOVꢂptgpemmOdVUꢀVeidVꢁꢀVlama sVeViOw
s ep VuꢂVsOquOicOVwallVbOVaia ae Od.
ꢁiV hOVt hOpVheid,VaiVfOOdbeckVceꢂeca tpVmtdO,VeVcuppOi VstupcO
tfV10µAVfptmV hOVRAMPVꢂaiVlama sV hOVdv/d VtfV hOVfOOdbeck
Design Information
Setting Under Voltage and Over Voltage Shut Down
FptmV hOVsOctidVOque atiVftpVeiVꢁꢀVshu VdtwiV hpOshtldVtfV65ꢀ
hOVveluOVtfVR3VmeyVbOVcelcule Od.
ThOVUꢀVeidVꢁꢀVꢂaisVepOVctiiOc OdV tVctmꢂepe tpsVwa hVitmaiel
1.21ꢀV hpOshtldsVeidV100mꢀVtfVhys OpOsasV(1.21ꢀV V50mꢀ).
ThOyVepOVusOdV tVdO Oc VuidOpVvtl egOVeidVtvOpVvtl egOVctida-
atisVe V hOVaiꢂu V tV hOVcapcua .VVWhOiOvOpV hOVꢁꢀVꢂaiVpasOsVebtvO
a sVhaghV hpOshtldV(1.26ꢀ)VtpV hOVUꢀVꢂaiVfellsVbOltwVa sVltw
hpOshtldV(1.16ꢀ)V hOVGATEVvtl egOVasVammOdae OlyVꢂullOdVltw,
hOVPWRGDVꢂaiVcheigOsV tVa sVaiec avOVs e OVeidV hOVOx Opiel
ceꢂeca tpVctiiOc OdV tV hOVRAMPVꢂaiVasVdaschepgOd.
65 × R3
OVOFF = 1.26 =
500kΩ
1.26 × 500kΩ
R3 =
= 9.69kΩ
65
ThOVcltsOs V1%VveluOVasV9.76kΩ.
Celcule atisVceiVbOVbesOdVtiVOa hOpV hOVdOsapOdVaiꢂu Vvtl egO
tꢂOpe aigVlama sVtpV hOVaiꢂu Vvtl egOVshu dtwiVlama s.VVIiV hO
ftlltwaigVOque atisV hOVshu dtwiVlama sVepOVessumOd.
FptmV hOVfaps VOque atiVftpVeVUꢀVshu VdtwiV hpOshtldVtfV35ꢀV hO
veluOVtfVR2VceiVbOVcelcule Od.
ThOVuidOpVvtl egOVeidVtvOpVvtl egOVshu VdtwiV hpOshtldsVceiVbO
ꢂptgpemmOdVbyVmOeisVtfV hOV hpOOVpOsas tpVdavadOpVftpmOdVby
R1,VR2VeidVR3.VSaicOV hOVaiꢂu VcuppOi sVtiV hOVUꢀVeidVꢁꢀVꢂais
epOViOglagablOV hOVpOsas tpVveluOsVmeyVbOVcelcule OdVesVftlltws:
35 × R2 + R3
(
)
UVOFF = 1.16 =
500kΩ
1.16 × 500kΩ
R2 =
− 9.76kΩ = 6.81kΩ
35
R2 + R3
UVOFF = VUVL = 1.16 = VEEUV(off )
OVOFF = VOVH = 1.26 = VEEOV(off )
×
R1 + R2 + R3
ThOVcltsOs V1%VveluOVasV6.81kΩ.
R3
×
ThOi
R1 + R2 + R3
R1 = 500kΩ − R2 − R3 = 483kΩ
ThOVcltsOs V1%VveluOVasV487kΩ.
WhOpOVV|ꢀEEUꢀ(tff)|VeidV|ꢀEEꢁꢀ(tff)|VpOle avOV tVꢀEEVepOVUidOpV&VꢁvOp
ꢀtl egOVShu VDtwiVThpOshtldVꢂtai s.
IfVwOVsOlOc VeVdavadOpVcuppOi VtfV100µAVe VeVitmaielVtꢂOpe aig
aiꢂu Vvtl egOVtfV50Vꢀtl sV hOi
50ꢀ
100µA
R1+ R2 + R3 =
= 500kΩ
A092605
5
SUPERTEX [ Supertex, Inc ]
