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DC-DC buck converter for charging SLA batteries.

Posted by: davjporter on

I have a 29VDC supply and need to charge/maintain a "24V" lead-acid battery.

To do this I need a 27.6VDC supply rail that is current-limited to about 750mA.

I don't require isolation.  The (-) rail will be common to the input and output.

I really just want to current-limit and voltage-limit the (+) rail.

Because the battery might be severly discharged (or the output leads short-circuited), the output voltage might be significantly <27.6V during current-limited charging, so a linear design might need to dissipate a significant amount of power.  (about 20W under worst-case conditions.)

For this reason a switcher seems like the best choice.

It sounds like all the functions found in so many DC-DC switchers you guys have, but it would require a P-channel FET in the switcher instead on an N-channel.

Is there a PI part that could do this with just an inductor?  (no transformer)

We need to keep parts cost to a minimum.

 

-Dave

评论

Submitted by PI-Cochrane on 10/19/2012

Why not try some othe part from TI, Maxim. PI is expert at AC/DC with 700V MOSFET.