LM5050MK-1EVAL: ORing circuit using LM5050MK-1

Ambuj Agarwal

Intellectual 290 points

Hope this one is clear

I have two power sources and I need to check if I have implemented the power supply ORing properly.

over 7 years ago

0 Karikalan Selvaraj over 7 years ago

TI__Genius 16305 points

Hello Ambuj,

Thanks for posting the question.
Schematic picture is not very clear, could you please attach a better resolution picture of schematic.

Regards,
Kari.

0 Ambuj Agarwal over 7 years ago in reply to Karikalan Selvaraj

Intellectual 290 points

Hello Kari,

I have edited the schematic posted earlier.

Regards,
Ambuj

0 Ambuj Agarwal over 7 years ago in reply to Karikalan Selvaraj

Intellectual 290 points

I am still awaiting any response on my query.

0 Karikalan Selvaraj over 7 years ago in reply to Ambuj Agarwal

TI__Genius 16305 points

Hi Ambuj Agarwal,

I have looked at the updated schematics and have the following comments.

1. Thermal pad of U4 and U5 are drain of MOSFET and have to be connected to drain.
2. We recommend to connect Vs pin to the same source as connected the input IN pin through 100 ohm. (U2 Vs pin to Batt_in through R2 and U3 Vs pin to Ext_pwr through R3). This is to avoid leakage from out to in pin when one channel power is off.
3. MOSFET U4 and U6 are 30mohm FETs and recommended operating nominal current is 0.75A and max about 5A.

What is the nominal current and maxiumum current in this application.

Regards,
Kari.

0 Ambuj Agarwal over 7 years ago in reply to Karikalan Selvaraj

Intellectual 290 points

Thanks for the reply, albeit delayed. nominal current for my application is 1A, and max 1.5A.

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LM5050MK-1EVAL: ORing circuit using LM5050MK-1