[sdiy] SSM2164 last time buys

[Andre Majorel]

On 2011-02-27 10:49 -0700, Scott Juskiw wrote:

> Is there a simple way to test for this "lack of negative
> supply" condition and disconnect the positive rail
> automatically before the chip becomes toast?

The V2164 is not the only chip reported to go postal when a
power rail goes away. Last week I was thinking of a way to
enforce a both-rails-or-neither rule.

Resettable fuses in thermal contact might or might not work. The
best solution I've found is a DPST 24 V relay, of the normally
open type, driven by both rails in series. Bad idea ? You tell
me.

Probably not suitable for protecting individual modules as
relays draw not insignificant current.

-- 
André Majorel http://www.teaser.fr/~amajorel/