Any experience with Fairchild FSFA2100?

Folks,

Has anyone used the FSFA2100 primary switcher chip? We are seeing some failures upon a "dirty" input power start-up. That shouldn't happen because per datasheet it has cycle-by-cycle current limit.

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg
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Folks,

Has anyone used the FSFA2100 primary switcher chip? We are seeing some failures upon a "dirty" input power start-up. That shouldn't happen because per datasheet it has cycle-by-cycle current limit.

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Regards, Joerg 

http://www.analogconsultants.com/ 
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Reply to
Harry D

Yes -- go hire a consultant, Joerg! Whatever were you thinking designing that part in that way!

Maybe I should hire a consultant to help me with my next digital servo loop -- what do you think?

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Tim Wescott 
Wescott Design Services 
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Reply to
Tim Wescott

You certainly need analog help ;-) ...Jim Thompson

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| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
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Reply to
Jim Thompson

I _am_ a consultant :-)

Ain't my design. It's one of those cases where I was approached late in the game, unfortuntely too late for a radical design change. Personally I never use fully integrated switcher ICs with on-chip power devices for anything more than a few watts.

:-)

However, in the not too distant future, for meaning

Reply to
Joerg

No, time :-)

Then we could do a more discrete design and be done with it.

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

I _am_ a consultant :-)

Ain't my design. It's one of those cases where I was approached late in the game, unfortuntely too late for a radical design change. Personally I never use fully integrated switcher ICs with on-chip power devices for anything more than a few watts.

Joerg, That FSFA2100 has been updated to a FSFR-XS2100. Looking at the upgrade may solve your problems. Or, HAC. Cheers, Harry

:-)

Regards, Joerg

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Reply to
Harry D

That one has a much higher Rdson and is functionally very different. Feedback is via the timing resistor input.

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If we have to redesign I'd certainly not use this kind of chip anymore, then we'd go with external FETs.

What is HAC?

Harry, you newsreader doesn't quote right. Not a problem but could confuse some people.

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

HAC = Hire A Consultant.

(He knows you're a consultant, Harry's just having a bit of fun. :-)

Cheers, James Arthur

Reply to
dagmargoodboat

Maybe a diode clamp on CS....or check LVCC behavior. Not much hysterisis there.

RL

Reply to
legg

That always checked out ok. Right now it looks like we might have had some bad chips, we can't make them fail anymore.

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

I certainly hope it's not one of these fine examples of Chinese counterfeit engineering:

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Reply to
Michael

Definitely not. My client only buys at reputable distributors.

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Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

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