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Gate Driver ICs Forum Discussions

User22451
Level 1
Level 1
Dear Community,

Hi, to all
I want to test desat pin function without any kind circuit?
Is there any approach for test only fault section without connecting igbt/mosfet to it?
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1 Solution
Abhilash_P
Moderator
Moderator 25 likes received 250 replies posted 250 sign-ins
Moderator
Hi,

The desat pin of 1ed family can be tested as follows,
" For this testing the desat pin external circuit (cap, resistor and diode) is still required. If you give an ON signal to the driver and reverse bias that DESAT diode, the constant current source will will eventually charge up the desat capacitor and trigger DESAT protection. This step is similar to the case that when a short circuit is happening and the Vce(sat) is too high and not able to clamp (bring down) the desat pin voltage."


Regards,
Abhilash P

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3 Replies
Abhilash_P
Moderator
Moderator 25 likes received 250 replies posted 250 sign-ins
Moderator
Hi,

The desat pin of 1ed family can be tested as follows,
" For this testing the desat pin external circuit (cap, resistor and diode) is still required. If you give an ON signal to the driver and reverse bias that DESAT diode, the constant current source will will eventually charge up the desat capacitor and trigger DESAT protection. This step is similar to the case that when a short circuit is happening and the Vce(sat) is too high and not able to clamp (bring down) the desat pin voltage."


Regards,
Abhilash P
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User22451
Level 1
Level 1
hey,
Thanks, Abhilash P for the reply. I have another doubt about which type of cap we have to use electrolyte, ceramic, or titanium.
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Abhilash_P
Moderator
Moderator 25 likes received 250 replies posted 250 sign-ins
Moderator
Hi,

It can only be a ceramic capacitor. This is because the range of capacitance for this is in several hundreds pF.

Regards,
Abhilash P
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