Heat dissipation of Voltage regulators
SkyDvv , 10-19-2024, 06:03 PM
Hey there, I have a question, I will be usuing this one for 200mA, from 12V to 5V which means 1.4W, is it okay, I don't see the Thermal resistance junction-PCB, it's only found in TI, will the heat dissiption will be 140C increase?
SkyDvv , 10-19-2024, 06:14 PM
I found SSP1117-5V are those numbers are valid?
SkyDvv , 10-19-2024, 06:14 PM
it's not written case or ambient
pradeepTamma83 , 10-19-2024, 10:14 PM
These information is not complete unfortunately. You need the PCB condition, like no of layers , footprints for SOT223. And for TO packages things little different
QDrives , 10-21-2024, 08:27 PM
The thermal resistance from junction to case is as it state to the case. Same for the SSP1117-5V, junction to case (within package).An indication on temperature rise is the junction to ambient, which is 100°C for DPAK. With 1.4W that means 140°C increase. Given you have the same surrounding conditions (for instance 25x25mm copper of 2oz)For a correct calculation/estimation you need to take all other thermal resistances into consideration. Do note that the manufacturer cannot specify this, as it is your design. They just give their package value.
Use our interactive Discord forum to reply or ask new questions.