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heat calculation

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windijon

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Hi!
How can I calculate the produced head if I have a 6 V & 3 A input to a battery charger chip which converts it to a 4.2 V and 0.5 A output?
 
Watts = Volts * Amps

If the input is 6V and 3A is flowing, the power is 18W
If the output is 4.2V and 0.5A, the power is 2.1W

The difference is coming out as heat due to inefficiency and is the difference = 15.9W

Actually how hot it gets depends on how well it can dissipate the heat, typically through a heat sink and maybe forced air cooling from a fan. You need to know the C/Watt rating of the device and heat sink to calculate that.

Brian.
 
Hi,

I doubt the 3A is the actual current input. I guess this 3A is the power supply rating.

If so: then the dissipation is a bit higher than (6V - 4.2V) * 0.5A = 0.9W

It is what it is: just a guess.

Klaus
 

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