TPS40305: TI WEBench Power Designer shows Depletion Mosfet, BOM shows Enhancement Mosfet

Noe Steiner

Part Number: TPS40305

I let Power Designer create a design for me: https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=6A2B344CF0EAC3CF

When i checked the schematic and searched for the recommended mosfets i found out, that these were Enhancement Mosfets. What should i use now and why is Power Designer showing a wrong symbol? Or am i just stupid?

over 2 years ago

0 Tahar Allag over 2 years ago

TI__Mastermind 30640 points

Hello Steiner,

Thanks you for reaching our for further clarifications.

Webench Tool provides initial recommended FET that can work with your design, but you can always change to what you need based on your requirement such as area, cost , efficiency etc.. Here is the LINK to NEXT-FET selection tool

www.ti.com/.../overview.html

Can you please point in which symbol that is not correct so we can fix it?

Thanks!

Tahar

0 Noe Steiner over 2 years ago in reply to Tahar Allag

Prodigy 20 points

Hello, thanks for the answer. If you check the schematics, "M1" & "M2" are showed as depletion mosfets, but in the datasheet that comes up if you follow the link it says that its an enhancement mosfet. Or am i wrong?

+1 Peter James Miller over 2 years ago

TI__Guru 52615 points

Noe Steiner

The TPS40305 should use Enhancement Mode N-Channel MOSFETs. I am not sure why the depletion mode MOFET symbol is used.

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TPS40305: TI WEBench Power Designer shows Depletion Mosfet, BOM shows Enhancement Mosfet