[sdiy] can a PSU destroy voices chips?

[Jean-Pierre Desrochers]

> PowerOne power supplies
> can be fitted with them, either as an option (OVP12 or OVP24) or as
> standard on the 5V outputs.

Good to know !!!!!




Le 2013-11-19 13:25, Neil Johnson a écrit :
> Hi,
> 
> Jean-Pierre Desrochers wrote:
>> I was speaking about terminal IN shorted to terminal OUT
>> causing the non-regulated high voltage to go at the reg out pin (!!!)
> 
> Ah sorry yes that would cause problems!
> 
>>> Carefully read the datasheet of that device.  The 17.1V is the 
>>> maximum
>>> working voltage.  The clamp voltage for that device is 25.2 volts.
>>> 
>> 
>> You are right on that. Sorry I didn't go that far in the transorb 
>> specs..
>> The thing was to suggest the transorb clamping technique
>> to save supply rails from going above a certain level.
> 
> Transorbs are not really the right device for this kind of thing.
> They are really meant for absorbing transient spikes (hence the name
> "TRANSient abSORBer") from things like lightning strikes or ESD
> shocks.
> 
> What you really want for regulator over-voltage protection is a
> crowbar (typically, zener, SCR, and fuse).  PowerOne power supplies
> can be fitted with them, either as an option (OVP12 or OVP24) or as
> standard on the 5V outputs.
> 
> Neil
> --
> http://www.njohnson.co.uk