LM5060: LM5060 usage in ORing configuration

Prodigy 120 points

Christophe Niclaes49

Replies: 6

Views: 74

Part Number: LM5060

Hello,

I'm using the LM5060 as power-path controller in an application with a schematic very similar to "Example Number 3: Reverse Polarity Protection with Resistor".

I'd like to connect the output of a Flyback DC/DC converter (PoE power supply) at the output of this schematic unsing a ORing configuration between the last MOSFET of the LM5060 schematic as the first diode and the output of the flyback MOSFET as the second diode.

Can I do that? Does the LM5060 support ORing configurations?

Guru 53675 points

Rakesh
- Sep 15, 2020 11:32 AM
Hi Chris,

LM74700-Q1 would be the right device for Oring configuration. Please go through the datasheet and let us know if you have any further questions.

Best Regards, Rakesh

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Prodigy 120 points

Christophe Niclaes49
- Sep 15, 2020 2:09 PM
In reply to Rakesh:

For sure LM74700-Q1 seams to be a good ideal diode controller.

But I want to avoid an additional chip and want to use LM5060 for its MIN/MAX input voltage control capabilities.

So what will be the behavior of LM5060 if another power supply is feed at its output through a diode?
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Guru 53675 points

Rakesh
- Sep 16, 2020 4:03 AM
In reply to Christophe Niclaes49:

Hi Chris, Can you share your system block diagram with details on the protection requirements to understand and suggest right solution. Do you need over voltage and over current protections in addition to oring? Best regards, Rakesh

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Christophe Niclaes49
- Sep 16, 2020 6:19 AM
In reply to Rakesh:

Hello,

I've a lot of constraints in this design and they are related to component sharing with other designs. That's why I need to know if a solution based on LM5060 is suitable before looking to other components.

Could you please provide an answer to my question: could I use the LM5060, with the Example 3 schematic from the datasheet, in a ORing configuration with another power source connnected to the output using a diode?
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Guru 53675 points

Rakesh
- Sep 16, 2020 2:27 PM
In reply to Christophe Niclaes49:

Hi Chris,

ORing controllers blocks reverse current (always) like a diode but LM5060 with back-to-back FET configuration needs to be disabled to block the reverse current. LM5060 is not suitable for active Oring application.\

Best Regards, Rakesh

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Christophe Niclaes49
- Sep 17, 2020 9:28 AM
In reply to Rakesh:

Thanks for your response!
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LM5060: LM5060 usage in ORing configuration

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