View single post by Si.
 Posted: Fri Feb 20th, 2015 03:09 am
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Si.



Joined: Thu Feb 23rd, 2012
Location: London
Posts: 5248
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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.

Cheers.

Si.



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