|View single post by Si.|
|Posted: Fri Feb 20th, 2015 03:09 am||
|A good rule of thumb (no pun intended) is...
...if you can hold your finger on a sinked chip...
...all is well & it will give longlife.
This is about 50c on the sink.
The junction-temp inside the chip can be 100c however.
The most significant improvement in sink performance...
...is usualy air-flow, whether forced or convection.
Vertical fins in free-air is the way to minimise sink size.
Alot of these DC-DC converters are intended for 'microelectronics'...
...rather than 'power-electronics' ie. motors.
1A load is quite a tall order without good sink AND ventilation !
(thankgoodness for thermal shutdown !)
To be honest, If I was doing this...
...I would look at different size/shape cells.
I think a properly running DC-DC converter with decent sinking...
...would take up WAY MORE room than an additional cell or two...
...and would be less efficient & probably less reliable in 'power' applications.
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