[sdiy] SSM2164 last time buys

[Oren Leavitt]

On 2/27/2011 5:35 PM, Scott Juskiw wrote:
> The problem I'm trying to solve is the lack of a negative supply when ground and positive supply are present. I'd like to have the positive supply be disconnected if the negative supply becomes disconnected. And, I suppose, the solution should also disconnect the negative supply if the positive supply is not present.
>
>> I'm not sure the problem here is clearly defined.
>> Is it a lack of a negative supply when the positive and ground rails are
>> present ?
>> Is it the presence of input voltages below the level of the absent negative
>> rail ?
>

Perhaps you might consider a tracking power supply design that ensures 
that both rails go down together when one goes down or is lost.

I have not used SSM2164, but have seen NE5532 in some cases draw 
excessive current, or even burn up, if one of one of the power supply 
rails is lost while the other remains on.

- Oren