LM2596S-ADJEVM: Current Limiting Protection

Dillon Brancheau

Part Number: LM2596S-ADJEVM
Other Parts Discussed in Thread: UCC39002, LM2596

If load of motor connected to output has max stall torque current of 4.2A, will current-limiting protection cause this chip to shutdown at 3A before it is damaged?

Also, can output of two of these chips be combined to provide more current?

over 8 years ago

0 JohnTucker over 8 years ago

TI__Guru**** 191445 points

Current limit for LM2596 is 4.5 A typical, 3.4 A minimum over temperature. It is very likely that the current limit will not activate at 4.2 A. Generally speaking, you cannot combine two of these in parallel. Typically, once converter will operate at maximum current and the other will supply the remainder. You could possibly consider using UCC39002 to connect two LM2596 in parallel

0 Dillon Brancheau over 8 years ago in reply to JohnTucker

Prodigy 30 points

John,

I am wondering why the datasheet lists max output load current of 3A for the LM2596 if the current limit is 4.5A typical?

0 JohnTucker over 8 years ago in reply to Dillon Brancheau

TI__Guru**** 191445 points

Current limit is set above the typical rated current for the device. Peak current will be higher than the load current by 1/2 ILp-p, so that has to be accounted for, plus some margin. Current limit is intended for fault protection, not to limit the current exactly at 3 A.

0 Dillon Brancheau over 8 years ago in reply to JohnTucker

Prodigy 30 points

It's an old code sir, but it checks out! +1

Thank you for your swift response

DB

/thread

0 JohnTucker over 8 years ago in reply to Dillon Brancheau

TI__Guru**** 191445 points

Just flying casual...

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LM2596S-ADJEVM: Current Limiting Protection