LM74700-Q1: Current Shared Power OR-ing

Sangbeom Jeong

Part Number: LM74700-Q1

Is it possible to use LM74700 with Current Shared Power OR-ing?

I want to use two Input Power 24V 0.6A Lines to make a merged Power Line 24V 1.2A

Is this safe ?

Also I want to use shutdown mode while Input < 9V applied by using just a simple resistor divider to make low quiescent current.

In this shutdown situation, Reverse Current Protection works well? Maximum Output will be 30V

over 6 years ago

0 Karikalan Selvaraj over 6 years ago

TI__Genius 16305 points

Hi SangBeom Jeong,

Yes it is possible to use LM74700-Q1 in current sharing ORing.
But we would need add some more discrete circuits along with LM74700-Q1.

Could you send me an email at "karikalan@ti.com" to take this discussion offline?

Also let us know the power supply accuracy of 24V supply, is it about 1% or 2% range?.

In shut down mode, Iq current of LM74700-Q1 is very low 1.5uA (maximum) and in this shutdown, MOSFET is turned off.
With the MOSFET off, body diode of the MOSFET will be blocking reverse current flow from one supply to another.

30V output is supportable.

Do you expect the two power supply voltages to vary drastically from one another?
For example do you have a case where PSU1 is 24V and PSU2 is 28V?

Regards,
Kari.

0 Sangbeom Jeong over 6 years ago in reply to Karikalan Selvaraj

Prodigy 100 points

Hi, Karikalan Selvaraj

I sended an E-mail of this issue

Thanks for all

SB, Jeong

0 Karikalan Selvaraj over 6 years ago in reply to Sangbeom Jeong

TI__Genius 16305 points

Hi

As we have taken this discussion offline, would like close this thread.
If you think so click "this resolved my issue" button at the end.

Regards
Kari.

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LM74700-Q1: Current Shared Power OR-ing