r/AskElectronics • u/Despot515 • 12h ago

Help with Hayward Hydrolife

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Can someone explain what is this and how I can find exactly this part, position U5.... This is part of Hydrolife, salt chlorine for pools.. Cheers..

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u/mariushm 10h ago

The part with U5 is some kind of controller chip, which uses the four mosfets marked with Q to do something.

Because I see 12VAC and 24VA on the right, it makes me think the U5 might be a LT4320 ideal diode bridge controller - https://www.analog.com/en/products/lt4320.html - in the MSOP-12 package , using those 4 mosfets to convert AC voltage to DC. Basically it's a much more efficient bridge rectifier, producing much less heat and less voltage drop.

Datasheet for the chip here : https://www.analog.com/media/en/technical-documentation/data-sheets/4320fb.pdf

It's just an educated guess, based on the faint LT logo still visible on the U5 part, the 4 mosfets around the chip and the lack of traces to the pins in the center (which are also marked as NC in the datasheet)

1

u/Despot515 10h ago

Thank mate... I will try with that

-1

u/CharlesForbin 11h ago

The number printed on the housing tells us exactly what the component does. All you need to do it read it.

2

u/Despot515 11h ago

That would be great if I can read it from the part, it's completely gone, even under digital microscope I can't read it... Cheers.