MOSFET transient calculation

T

Techman_7

Full Member level 2
Joined
Dec 21, 2013
Messages
138
Helped
0
Reputation
0
Reaction score
1
Trophy points
1,298
Activity points
2,420
If a MOSFET is operated at different current levels and pulse widths (say 5ms, 15ms, 50ms etc. with only conduction loss), how to determine the Pd and Tj ?
 

Sort by date Sort by votes
Hi,

first of all it depends on frequency.

then calculate the average power dissipation. According V x I (as always)
then calculate the temperature rise
and add it to your ambient temperature


All as usual, nothing special (unless you missed to tell us) ...

--> thus you ill find many hundreds of application notes, examples, web sites, online calculators ... and so on.

It not even depends whether it´s a MOSFET, IGBT, triac, LED, resistor, diode, lamp, soldering iron, ... it all follows the same ruels of electronics and physics.

Klaus
 

Upvote 0 Downvote
Most exact junction temperature for arbitrary pulse load can be calculated with thermal model, if available, in a simulator. Dynamic thermal resistance curves in datasheet gives at least an idea.
 

Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…