lasts
to
this:
80Vdown
decay
needs
and
that?
long
MOSFETs to handle that situation- none of which are single component unfortunately. And a load dump can put more than 1-2A into a shunt- way more.
the
fine.
impedance?
Don't know if it will be fast enough, but maybe some combination of something like a TLV431 and a beefy FET. I know awfully close to a zener and a beefy transistor. But the differences in device properties may be exploited usefully.
?-)
MOSFETs to handle that situation- none of which are single component unfortunately. And a load dump can put more than 1-2A into a shunt- way more.
That's usually how I do it. But no space :-(
-- Regards, Joerg http://www.analogconsultants.com/
to handle that situation- none of which are single component unfortunately. And a load dump can put more than 1-2A into a shunt- way more.
If this is just a power bus, and you're only protecting the sources, then simple orring diode would work. If this is a power input, then you need to examine the components used for surge immunity. Just saying 'it can't go over 100V' is nuts. The question is what happens when it does.....
The use of controlled avalanche parts and surge-rated parts provides the paper spec to meet surge conditions - which are not the same as absolute maximum ratings, and you should know this. Parts that actually contact the surging node, or which experience the effects of the surge are small in number and are identifiable.
This work is confirmed by demonstration.
RL
MOSFETs to handle that situation- none of which are single component unfortunately. And a load dump can put more than 1-2A into a shunt- way more.
An IC will exceed abs max and go kaputt. Not necessarily in an explosive manner but the mfg won't guarantee. Even a whiff of an "amperage scent" in a no-no here. It's for a regulated market and one simply cannot do that.
Sure I know. _Getting_ the specs is the problem. These days the support at many semi mfgs has become something between barely responsive and recalcitrant. Especially after comnies have been acquired. When I had a similar issue five years ago I had the required documents in hand within the week. No more.
In this application things must be confirmed by the mfg, and in writing.
-- Regards, Joerg http://www.analogconsultants.com/
Linear bipolar IC fab processes don't necessarily respond in the manner described. The voltage rating of the process used generally exceeds the maximum specified operating condition by a considerable margin. What you will get are abnormal/uncharacterized response and behaviour (some of it not quickly or even totally reversible), overheating and in some power applications, the action of internal zeners - which can experience overstress and failure, as might be expected.
Sometimes a current-limited surge voltage is specified, where the zenering is intentional and controlled. It may even show on the device schematic. Being pin-dependent - some pins are more sensitive than others.
Don't blame them for not coming up with info that they'd never had any intention of providing.
By the way, have just noticed that the BZG03C series (zeners with surge ratings) offer the 10mA Itz level that you have chosen to demand. No clamping levels speced for zeners, though.
The change from SMA to SMB body involves only a body width increase from 0.11 to 0.15. SM foil patterns are largely unaffected. This could bring clamping levels down to below 110V.
If more than one clamp is attached to a bus, then clamping current levels are also going to be reduced - assuming all inputs have one......
RL
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