High Current Schottky Diodes?

[rkosiorek]

@ rkosiorek: I know what the "ideal diodes" are http://www.ti.com/lit/an/slva139/slva139.pdf
I've used the P-ch circuit as reverse polarity protection

It won't work in this case since each pack will turn the fet on and subsequently short the two packs together

A circuit based on fets would work as long as there's logic in place to turn the highest pack on only - but that is not an "ideal diode" anymore

well "true ideal diodes" with a proper controller do not allow reverse current under any circumstances.

http://cds.linear.com/docs/Datasheet/4357fd.pdf

that TI appnote is not a full implementation of an ideal diode. it just a partial implementation that uses some features of an ideal diode in a charger. in a true ideal diode.

rick

[full-throttle]

well "true ideal diodes" with a proper controller do not allow reverse current under any circumstances.

In the event of a power supply failure, such as if the output of a fully loaded supply is suddenly shorted to ground, reverse current temporarily flows through the MOSFET that is on. This current is sourced from any load capacitance and from the other supplies. The LTC4357 quickly responds to this condition turning off the MOSFET in about 500ns, thus minimizing the disturbance to the output bus.

page 6 in your link

Otherwise it's essentially what I wrote

A circuit based on fets would work as long as there's logic in place to turn the highest pack on only

Look, I don't want to argue - it appears our definition of "ideal diode" is different. Others got to understand they are not really diodes so should not be treated as such.