Trend ? High-Side switch

Probably I'd opt for the driver and FET solution. If the chip is single sourced I'd be concerned about availability and obsolescence.

DigiKey carries a selection of the infineon parts - search for profet.

-- Regards, Carl Ijames carl.ijames at verizon.net

STM - VNxxx(i.e. VN750). Infineon - BSP742/752

Digikey has them on stock. Arrow/Future carry some high-side switches too.

It seems they dropped a High side switch that would have fit the application. Nothing but 2.7-5.5v parts. I wish I remember what the part was I used a few years back. But it could Handle 15v.

Cheers

Found it....

Cheers

A guy has taken the guts from one of those "ion breeze" air cleaners and is using that to pump air inside a PC case over some passive heatsinks on the CPU and such. I wouldn't think they would pump much CFM but don't know. Anyone have any experience with them.

He matches that silent air circulator with a solid state disk and no moving parts power supply to get a totally silent PC.

Robert

is

moving

Robert, try posting this as a separate thread. It's not good practice to post a new thread as a response to an earlier one. Also, no one can see it unless they open the "Trend High Side Switch" thread.

... Steve

s/much/any

The ionic breeze has no pump and doesn't work at all as an air filter.

If you're lucky, you might get some convection, but it won't anything to do with the IB's snake oil.

Duller Image sued Consumer Reports for calling IB worthless. Consumer Reports prevailed, yet Duller Image keeps advertising that piece-a-crap.

...Jim Thompson

People,

Thanks all for your posts and valuable suggestions...

= HighSideDriver+Discrete... might still do this.

= BSP742/752... I think I veered away from these when I saw that they are not RoHS compliant, and Infineon ISP parts are all RoHS compliant. For better or for worse, I have been using RoHS availability as a kind of proxy for recommended-for-new-designs.

= Micrel, I'll investigate both parts.

= VN750, that's good to know about.

Let me investigate and report back. Btw my OP said 100 mOhm, my mistake: the 0.1 on my mind was V, could probably go higher if needed, only I'm already concerned about resistive line drop and 5% tolerance on the power supply.

Thanks !

-rajeev-

snipped-for-privacy@ieee.org wrote:

The ionic breeze type cleaner claims it circulates air **and** cleans it. The guy is apparently using the guts as a silent air circulation system across the passive heatsinks on the CPU and other components. He includes CFM numbers in the table of the last section. I just don't know whether to believe the high numbers he quotes.

Robert

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Yeah, I heard about that. I don't remember him quoting that brand but it's a similar type. I'm just surprised it can move air by the amount he says in the table at the end. He's just using it as a silent air mover over the passive heatsinks with no "cleaning" going on. The most likely explanation is he's wrong in his measurements.

Robert

It doesn't circulate anything. It can precipitate a little dust into little ionized clumps. It can put some ozone in the air. But it doesn't circulate anything. The ads and claims are bullshit.

I don't see why an "ionic breeze" couldn't theoretically work - with the right electrode design, I'd think that a plasma stream might entrain air, or maybe it's just a combination of static and inertia.

I'm also thinking about stuff like those "levitator" ideas, which AFAIK were just ionic jets of some kind.

Anybody got the straight poop?

Thanks, Rich

Look up the word "static" sometime. :-) The ionic breeze generates some static electricity; it can't generate a continuous flow.

Most of them are just magnetic revulsion.

Why not just get a quiet case and a quality cpu fan?

Well, I meant the straight poop about ionizing air, accelerating the ions through an electric field, and entraining ordinary un-ionized[1] air in the resulting ion stream, but thanks anyway! :-)

Cheers! Rich