LM5041: LM5041 load sharing with UC2907

Nesh Johny

Part Number: LM5041
Other Parts Discussed in Thread: UC2907, UCC29002

Dear Sir,

Is it possible to implement load sharing in LM5041, also i have following doubts:

1. How to use UC2907 with LM5041 is it possible at 900KHz

2. Is there any solution from which I can limit the reverse current from the output side if I parallel with another power supply with same output voltage. with output current rating of 20Amin

over 6 years ago

0 John Griffin1 over 6 years ago

TI__Mastermind 34465 points

Hello Johny,
Yes it is possible to use the LM5041 in a load sharing application. I suggest you use the UCC29002 rather than the UC2907 since the UCC29002 is a newer part with overall improved qualities and you can use the LM5041 with an oscillator frequency of 900kHz.
It is not possible to just parallel power supplies and expect to achieve proper current sharing. You will need both power supplies to be controllable by separate load share controllers and if designed properly you will be able to share loads with good accuracy at 20A.
I suggest that you obtain a design specification for your application and study the data sheet and design notes for the UCC29002 before your proceed to an actual circuit design.
Hope this helps.
Regards
John

0 Nesh Johny over 6 years ago in reply to John Griffin1

Expert 1310 points

thank you sir for the immediate reply. if I use UCC29002 as shown in datasheet,

1. whether LM5041 remote sensing is affected due to IC UCC29002

2. Why is 3 Diodes (D4,D5 & D6) required in the feedback circuit

0 John Griffin1 over 6 years ago in reply to Nesh Johny

TI__Mastermind 34465 points

Hello Johny
Where did you find this circuit?
I have not seen it before.
Regards
John

0 Nesh Johny over 6 years ago in reply to John Griffin1

Expert 1310 points

Dear Sir,

Please find the attached document.

UCC39002 Load-Share Controller for TPS40050 Modules.pdf

0 John Griffin1 over 6 years ago in reply to Nesh Johny

TI__Mastermind 34465 points

Hi Johny,
The purpose of the diodes D4,D5,D6 is described in Section 4.2 "Starting into a full system load" of the document you referenced above.
You will need to read the documents before you attempt to use any of these parts and you will find this advice very useful as you proceed.

Regards
John

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LM5041: LM5041 load sharing with UC2907