Heatsink

[dcac]

Hi there,

Does anyone know about heatsinks?
I found this equation temperature of junction is equal to ambient temperature plus power dissipation at the junction times total thermal resistance of the system. So if I add heatsink on I rise junction temperature. So how does the heatsink help to improve cooling?

Thanks

 

[(*steve*)]

In most normal circumstances adding a heatsink reduces the junction temperature because the thermal resistance between the junction and the ambient environment is reduced.

Have a look in the resource section. We have a partially completed resource on heatsinks that might help you.

 

[(*steve*)]

See here https://www.electronicspoint.com/resources/do-i-need-a-heatsink-how-big.29/

 

[dcac]

thanks, it looks like a very well written article.

 

[OBW0549]

Does anyone know about heatsinks?
I found this equation temperature of junction is equal to ambient temperature plus power dissipation at the junction times total thermal resistance of the system. So if I add heatsink on I rise junction temperature. So how does the heatsink help to improve cooling?

Heatsinks reduce the junction-to-ambient thermal resistance, not increase it.

 

[Herschel Peeler]

How much heat are you trying to dissipate? Fan or no fan?