Author Topic: [ASK] Stacking up multiple TVS in series  (Read 787 times)

0 Members and 1 Guest are viewing this topic.

Online BravoV

  • Super Contributor
  • ***
  • Posts: 5408
  • Country: 00
[ASK] Stacking up multiple TVS in series
« on: November 03, 2015, 08:20:46 pm »
Currently I have only 5 Volt rated TVS in stock, plan is to protect power mosfet's Vgs (non logic level Vgs@20V max) by using 3 of these 5 volt TVSes connected in series to get up to 15 volt, also its only one off ad hoc project.

Will these work ?

Offline rs20

  • Super Contributor
  • ***
  • Posts: 2066
  • Country: au
Re: [ASK] Stacking up multiple TVS in series
« Reply #1 on: November 03, 2015, 08:31:17 pm »
Yeah, more or less. Your inaccuracies will be tripled, maybe check that it actually does shunt at the absolute max Vgs. Otherwise a nominal 5V TVS which actually trips at 8V * 3V = 24V Vgs and a dead mosfet. But the reason that

By contrast, things like gas discharge tubes and trisils cannot be used in series, because the V/I curve is discontinuous so you might end up with weird halfway states. But TVSs just have a nice monotonic VI curve; and putting them in series just triples the voltages.
 

Online BravoV

  • Super Contributor
  • ***
  • Posts: 5408
  • Country: 00
Re: [ASK] Stacking up multiple TVS in series
« Reply #2 on: November 04, 2015, 06:48:26 pm »
rs20, thank you !  :-+

Offline Kjelt

  • Super Contributor
  • ***
  • Posts: 4989
  • Country: nl
Re: [ASK] Stacking up multiple TVS in series
« Reply #3 on: November 04, 2015, 11:44:56 pm »
Interesting, going to test this soon, saves me also an extra component to order  :-+
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf