SV: Re: [sdiy] BBD clock circuit

[harry bissell]

Ahhh OK

Two totem-pole outputs actually equal one H-bridge driver (looked at 
that way)
You just don't float the load... and the fact that they are 
non-oerlapping anyway
is just a feature...

H^) harry


JH. wrote:
>>> I saw the gates that prevent overlapping: but the output
>>> is just a half-bridge, i.e. two transistors for driving
>>> a center tapped transformer for pus-pull operation.
>>> For a BBD, I think I need a full H-Bridge - that's why I was asking.
>>>
>>>       
>> I think you mean "totem pole" output ???
>>
>> An H bridge would be a four transistor structure with a floating load...
>> you don't need
>> that for a BBD (which suck, btw :^) which is single ended at the clock
>>     
>
> I'm never so sure about using the right words. But if totem pole, then two
> totem poles (for the two clock inputs). Now in switched power supplies,
> you use two totem poles (=  one H bridge) to drive a floating winding
> indeed.
> So even if in the BBD application you wouldn't call it H-bridge, you might
> call it H-bridge in a switcher IC that you want to (ab)use as BBD driver.
>
> JH.
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