HV301/HV311
Design Information, cont’d.
ThOsOVOque atisVessumOV he V hOVltedVasVꢂupOlyVceꢂeca avOVeid
hOVftlltwaigVdOfaia atisVeꢂꢂly.
Start up Overload Protection
S ep VuꢂVmus VbOVechaOvOdVwa haiVeVitmaielV100msVesVaidace Od
byV hOVPWRGDVꢂaiV peisa atiV tV hOVec avOVs e OVtpV hOVcapcua Vwall
pOsO VeidVeiVeu tme acVpOs ep VwallVaia ae OVef OpV12sVdOley.VVIfV hOpO
asVeiVtu ꢂu VtvOpltedVtpVshtp Vcapcua VdupaigVs ep Vuꢂ,V hOVcapcua Vwall
bOVaiVVeVcuppOi VmtdOVftpV hOV100msV amOVlama .
CRAMPVasV hOVOx OpielVceꢂeca tpVctiiOc OdV tV hOVRAMPVꢂai.
IRAMPVasV hOVtu ꢂu VcuppOi VfptmV hOVRAMPVꢂai,Vitmaielly
10µA,VwhOiV hOVvtl egOVdptꢂVtiVRSENSEVpOsas tpVasVzOpt.
ꢀINTVasV hOVai OpiellyVpOgule OdVsuꢂꢂlyVvtl egOVeidVceiVpeigO
fptmV8.5ꢀV tV12ꢀ.
Circuit Breaker
ThOVcapcua VbpOekOpVwallV paꢂVaiVlOssV heiV5µsVwhOiV hOVvtl egOVti
ꢀGS( h)VasV hOVge OV hpOshtldVvtl egOVtfV hOVOx OpielVꢂess
peisas tpVeidVmeyVbOVtb eaiOdVfptmVa sVde eshOO .
hOVSENSEVꢂaiVpOechOsVeVitmaielV100mꢀV(2.0VxVI ).VVAVpOsas tp
LIMIT
aiVsOpaOsVwa hV hOVSENSEVꢂaiVeidVeVceꢂeca tpVctiiOc OdVbO wOOi
hOVSENSEVeidVꢀ EEVꢂaisVmeyVbOVeddOdV tVdOleyV hOVpe OVtf
vtl egOVpasOVtiV hOVSENSEVꢂai,V husVꢂOpma aigVeVcuppOi VtvOp-
shtt VeidVdOleyaigVCapcua VBpOekOpVec ave ati.
ꢀGS(lama )VasV hOVOx OpielVꢂessV peisas tpVge O-stupcOVvtl egO
pOquapOdV tVtb eaiV hOVlama VcuppOi .VVI VasVdOꢂOidOi VtiV hO
ꢂessV peisas tp’sVchepec Opas acsVeidVmeyVbOVtb eaiOdVfptm
hOV peisfOpVchepec Opas acsVtiV hOV peisas tpVde eshOO .
Automatic Restart
gfsVasV hOV peisctiduc eicOVtfV hOVOx OpielVꢂessV peisas tp
eidVmeyVbOVtb eaiOdVfptmVa sVde eshOO .
ThOVAu tme acVROs ep VdOleyV amOVasVdapOc lyVꢂptꢂtp atielV tV hO
ceꢂeca eicOVe V hOVRAMPVꢂai.VAu tme acVROs ep VsOquOicOVas
ec ave OdVwhOiOvOpV hOV100msV amOtu VasVpOechOdVdupaigVs ep Vuꢂ
tpV hOVCapcua VBpOekOpVasV paꢂꢂOdVaiVltwVꢂtwOpVslOOꢂVtꢂOpe aig
mtdO.
RFBVasV hOVai OpielVfOOdbeckVpOsas tpVeidVasVitmaiellyV5kΩ.
ILIMITVasV hOVltedVcuppOi VwhOiV hOVvtl egOVdptꢂVtiV hOVR
SENSE
pOsas tpVasV50mꢀ.
ThOsOVOque atisVmeyVbOVusOdV tVcelcule OV hOVmaiamumVveluOVtf
CRAMPVftpV hOVmts Vcpa acelVsys OmVꢂOpftpmeicOVchepec Opas acs.
Au t-pO pyVceiVbOVeꢂꢂptxame OdVesVei
SSS- amOpVwa hV2.5µAVchepgOVuꢂVeid
chepgOVdtwiVcuppOi sV hptughV28ꢀ,V tVe
ctui VtfV256.VThOpOftpO,
2.5A
FtpVmexamumVcti ec VbtuicOVdupe atiVꢂpt Oc atiVchttsOVe
veluOVftpV PꢁRVeidVusOV hOVftlltwaigVOque ati:
2.5A
Cramp
2 × 8 × 256
2.5µA
tPOR × IRAMP
2.4 + VGS(th)
TAUTꢁRETRY
=
× Cpamꢂ
CRAMP
=
IfVcti ptlVtfVPWRGDVec avOVdOleyVasV hOVcpa acelVsys OmVꢂepem-
DuOV tV hOV2.5µAVmexVchepgOVcuppOi VeVpOsas tpVwhachVdpews
mtpOV heiV2.5µAVbOltwV8ꢀVwallVdaseblOV hOVeu tpO py.VTpyV t
kOOꢂV hasVpOsas tpVesVbagVesVꢂtssablO,VO.g.V2.5mý,VftpVmts
O Op,V hOiVchttsOVeVveluOVftpV
Oque ati:
PWRGDVeidVusOV hOVftlltwaig
MꢁSFETsVwa hVmexVꢀ tfV4ꢀV hasVwallVvepyV hOV10µAVcuppOi
stupcOVbyVtilyV4/2.5mý=1.6µA.
V
tPWRGD × IRAMP
VINT − VGS(lama ) − 1.2
CRAMP
=
A092605
8
SUPERTEX [ Supertex, Inc ]
