STEF01 SOA and reaction time

[DamianP]

I have read the STEF01 datasheet looking for how STEF01 will respond to output short-circuit hard. After reading it I have no clue. What is the reaction time of the fuse to short circuit? Other vendos provide such informations.

Second issue is that there is no info about SOA of internal pass element. There are no clues to guess that power limiter will be triggered or not.
Other people also asked such questions on this forum, no response so far. Please respond or add missing data to datasheet.

[Peter BENSCH]

Well, STEF01 should not be confused with a classic fuse because it offers considerably more extensive functions.

The response time of the STEF01 cannot be found in the data sheet because it depends on the ambient conditions, the settings and the external circuitry. The last two points are reflected in the data sheet, section 5.1.4 (Current limit), the first is discussed there in section 5.2 (Protection circuits). In addition, it must be taken into account that the thermal protection is also influenced by the current load and the ambient temperature. All of this is application-specific and therefore not part of the general data sheet.

Hope that helps?

Good luck!
/Peter

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[DamianP]

I see, in my haste I forgot that this is a community forum. Sry, thx.

Could someone measure and share STEF01 reaction (where reaction time is visible) to output short-circuit while configured to 4A, operating from 24V? Share also details about PSU or battery, whatever you used as the power source.
You can help me and many people that search about this chip. BTW for some other people you could share result at say 12V. 

 

[DamianP]

Finally i owned the STEVAL-EFUSE01 and measured what i needed by myself. Setup was a 24V 10A PSU, unmodified evalboard, auto restart jumper inserted. Current probe was 50mOhm shunt. See the picture below. It is a input current (yellow) and input voltage (green) while STEF01 output short-circuit. Short-circuit peak is nice limited to 7A, reaction time is in microseconds. After 8ms thermal protection start to cycling the output current. Hope it will help someone.