MOSFET Failure Analysis: Kutloisiso, Thibelo, le Tharollo

Kakaretso e Potlakileng:Li-MOSFET li ka hlōleha ka lebaka la likhatello tse fapa-fapaneng tsa motlakase, mocheso le mechine. Ho utloisisa mekhoa ena ea ho hloleha ho bohlokoa bakeng sa ho theha litsamaiso tse tšepahalang tsa motlakase. Tataiso ena e pharaletseng e hlahloba mekhoa e tloaelehileng ea ho hlōleha le mekhoa ea thibelo.

Mekhoa e Tloaelehileng ea ho hloleha ha MOSFET le Lisosa tsa Tsona

1. Liphoso Tse Amanang le Voltage

Ho senyeha ha heke ea oxide
Ho robeha ha avalanche
Punch-through
Tšenyo e tsitsitseng ea ho ntša

2. Ho hloleha ho Amanang le Mocheso

Karohano ea bobeli
Mocheso oa ho baleha
Sephutheloana delamination
Ho phahamisa terata ea bond

Mokhoa oa ho hloleha	Mabaka a mantlha	Matshwao a Temoso	Mekhoa ea ho Thibela
Karohano ea Heke ea Oxide	VGS e feteletseng, liketsahalo tsa ESD	Keketso ea ho lutla ha heke	Tšireletso ea motlakase oa heke, mehato ea ESD
Thermal Runaway	Ho felloa ke matla ho feteletseng	Mocheso o ntseng o phahama, lebelo le fokotsehileng la ho fetoha	Moqapi o nepahetseng oa mocheso, o fokotseha
Karohano ea Avalanche	Li-spikes tsa motlakase, ho fetoha ha inductive ho sa kenngoeng	Sekepe se sekhuts'oane sa "drain source".	Li-circuits tsa snubber, li-clamps tsa voltage

Winsok's Robust MOSFET Solutions

Moloko oa rona oa morao-rao oa MOSFET o na le mekhoa ea ts'ireletso e tsoetseng pele:

SOA e ntlafalitsoeng (Sebaka sa Ts'ebetso se Sireletsehileng)
Ts'ebetso e ntlafalitsoeng ea mocheso
Tšireletso ea ESD e hahiloeng ka hare
Meetso e lekantsoeng ka sekhahla

Lekola Letoto le Sirelelitsoeng la MOSFET

Tlhahlobo e Feletseng ea Mekhoa ea ho Hlōleha

Karohano ea Heke ea Oxide

Lintlha tsa bohlokoa:

Maximum Gate-Source Voltage: ± 20V e tloaelehileng
Botenya ba Heke ea Oxide: 50-100nm
Matla a Tšimo ea Karohano: ~ 10 MV/cm

Mehato ea Thibelo:

Kenya ts'ebetso ea ho koala motlakase oa heke
Sebelisa li-resistors tsa liheke tsa letoto
Kenya diode tsa TVS
Mekhoa e nepahetseng ea sebopeho sa PCB

Taolo ea Mocheso le Thibelo ea ho Hlōleha

Mofuta oa Pakete	Max Junction Temp	Recommended Derating	Tharollo ea ho Pholisa
HO TSA-220	175°C	25%	Heatsink + Fan
D2PAK	175°C	30%	Sebaka se seholo sa Koporo + Heatsink ea Boikhethelo
SOT-23	150°C	40%	Tšela ea Koporo ea PCB

Malebela a Bohlokoa a Moralo bakeng sa ho Tšepahala ha MOSFET

Setšoantšo sa PCB

Fokotsa sebaka sa loop ea heke
Matla a arohaneng le mabaka a pontšo
Sebelisa khokahano ea mohloli oa Kelvin
Ntlafatsa ho beoa ha mocheso ka tsela ea mocheso

Tšireletso ea Potoloho

Kenya tšebetsong li-circuits tse qalang ka bonolo
Sebelisa li-snubbers tse loketseng
Eketsa ts'ireletso ea reverse voltage
Lekola mocheso oa sesebelisoa

Mekhoa ea Tlhahlobo le Tlhahlobo

Protocol ea Motheo ea Teko ea MOSFET

Teko ea Static Parameters
- Matla a matla a monyako (VGS(th))
- Mohloli oa metsi o hanyetsang (RDS(ho)
- Heke leakage current (IGSS)
Teko e Matla
- Linako tsa phetoho (ton, toff)
- Litšobotsi tsa tefiso ea heke
- Bokhoni ba tlhahiso

Litšebeletso tsa Ntlafatso ea Botšepehi ba Winsok

Tlhahlobo e phethahetseng ea kopo
Tlhahlobo ea mocheso le ho ntlafatsa
Teko ea botšepehi le netefatso
Ts'ehetso ea laboratori ea tlhahlobo ea ho hloleha

Kopa Tlhahlobo ea ho Hloka
Tšehetso ea tekheniki

Lipalo-palo tse Tšepahalang le Tlhahlobo ea Bophelo Bohle

Lintlha tsa bohlokoa tsa ho Tšepahala

FIT Rate (E hloleha ka Nako)

Nomoro ea ho hloleha ka lihora tse bilione ea sesebelisoa

0.1 - 10 FIT

E ipapisitse le letoto la morao-rao la MOSFET la Winsok tlasa maemo a ikhethileng

MTTF (Nako e Bohareng ea ho hloleha)

Ho lebeletsoe bophelo bohle tlas'a maemo a boletsoeng

>10^6 lihora

Ho TJ = 125 ° C, motlakase oa lebitso

Sekhahla sa ho Pholoha

Liperesente tsa lisebelisoa tse ntseng li le teng ho feta nako ea tiisetso

99.9%

Ka lilemo tse 5 tsa ts'ebetso e tsoelang pele

Lintho tse Nyahamisang Bophelong bohle

Boemo ba ho sebetsa	Ntho e Nyatsang	Tšusumetso bophelong bohle
Mocheso (ka 10°C ka holimo ho 25°C)	0.5x	Phokotso ea 50%.
Voltage Stress (95% ea maemo a holimo)	0.7x	Phokotso ea 30%.
Maqhubu a ho Fetoha (2x lebitso)	0.8x	Phokotso ea 20%.
Mongobo (85% RH)	0.9x	Phokotso ea 10%.

Kabo ea monyetla oa bophelo bohle

Kabo ea Weibull ea bophelo bohle ba MOSFET e bonts'a ho hloleha ha pele, ho hloleha ho sa reroang, le nako ea mokhathala

Mabaka a Khatello ea Tikoloho

Temperature Cycling

85%

Tšusumetso phokotsong ea bophelo bohle

Power Cycling

70%

Tšusumetso phokotsong ea bophelo bohle

Khatello ea Mechini

45%

Tšusumetso phokotsong ea bophelo bohle

Liphetho tse potlakileng tsa liteko tsa bophelo

Mofuta oa Tlhahlobo	Maemo	Nako	Ho hloleha Rate
HTOL (Bophelo ba Tšebetso ea Mocheso o Phahameng)	150°C, Max VDS	1000 lihora	<0.1%
THB (Leeme la Mongobo oa Mocheso)	85°C/85% RH	1000 lihora	<0.2%
TC (Temperature Cycling)	-55°C ho ea ho +150°C	1000 lipotoloho	<0.3%