DC/DC short circuit detection

[shaiko]

What is the common method for a DC/DC converter to detect a short circuit on the output?
Does it simply assume a short circuit because of overcurrent ? Or there're other ways?

 

[Nasser750gx]

What controller are you using? Intersil? Texas? IOR? Multiphase or single-phase?

 

[shaiko]

This one:
https://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=tps54140a&fileType=pdf

 

[malli_1729]

Most of the converters will have both over current protection and short circuit protection mechanisms....see the actual datasheet for details. generally short circuit will be associated with output voltage reduction in addition to Over currentt....

 

[shaiko]

Most of the converters will have both over current protection and short circuit protection

How is short circuit protection implemented if not via means of detecting current flow over a certain threshold ?

 

[dick_freebird]

You can detect a short circuit by direct current sense
(against a threshold that sits above max normal current
limit, and perhaps in concert with an output undervoltage
term, plus some idea about whether the part is in soft start).

You can check for failure-to-transition, on a switching
output. But this is not useful at the DC output of the
brick.

A key question is short-to-what? Most people think about
ground. There are other possibilities. But dealing with every
single stinkin' permutation of monkey screwdriver stupidity
will blow your design schedule right out of the water.

 

[Orson Cart]

The IC you have chosen has the capabiltiy for current limiting, so you are sorted.....

 

[shaiko]

The IC you have chosen has the capabiltiy for current limiting

I know that...but does it also have a mechanism for short circuit detection?
If it does, how does it work?

 

[FvM]

Review the "Overcurrent Protection and Frequency Shift" section in the TPS54140A datasheet and decide if it offers sufficient protection for your application.

 

[Anna Conda]

No it does not detect a short cct, you need to define how hard a short, 0.1V, 0.2V, 0.005V...?
if you need to detect a short you will need to devise your own ckt.