LM5050-2: The risk of reverse current under operation voltage < 6V and some questions for application circuit

Takamaru Akita

Part Number: LM5050-2

Hi team,

I have some questions for LM5050-2.

Q1. Would you tell me the behavior of LM5050-2 under operation voltage < 6V ?

We are going to use LM5050-2 to prevend the reverse current between parallel-connected power supplies(12V).

I anxious the reverse current occurs under operation voltage because of the difference of slew rate when power supplies ON or OFF .

Does it needs for external circuit to prevend reverse current under 6V ?

(For example, the voltage monitor circuit of IN pin.)

Q2. If possible, could you provide an LM5050-2 application example of parallel-connected power supplies.?

Q3. Could I use OFF pin under operation voltage 6V to pull down GATE pin ?

Thanks

Best regards,

Akita

0 Karikalan Selvaraj over 3 years ago

Hi Takamaru,

Firstly, 6V minimum operating is specified across temperature.

Below 6V, LM5050-2 will turn off the MOSFET and body diode of external MOSFET will block reverse current.

I am looking into this question and will get back today.

Regards,

Kari.

0 Karikalan Selvaraj over 3 years ago in reply to Karikalan Selvaraj

TI reference design using LM5050-2 "http://www.ti.com/tool/PMP7824".

This design is for 7.5A , 12V power supply rails.

When LM5050-2 goes below 6V, it will turn off the MOSFET and reverse current will be blocked.

However, for additional safety, LM5050-2 OFF pin can be used to turn off the MOSFET when IN reaches 6V using a resistor ladder (divider).

Regards,

Kari.

0 Takamaru Akita over 3 years ago in reply to Karikalan Selvaraj

Hi Kari

Very thank you for your kind reply and investigation!

My questions have been cleared.

I'll close this thread.

Thanks

Best regards,

Akita

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