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Part Number: TPS55340
Hi, I'm using TPS55340 for boost converter 18V-23V to 24 V and 3A. But it's heating while drawing 1.5A. Why? Datasheet says it can handle 5A but even 1.5A it is getting hot not only TPS55340, also diode and inductor. I build nearly same circuit on webench which is below. There are only 2 difference between my design and webench. Diode 5A 60V(Webench says 10A 200V) and RCOMP 3.3K(Webench says 3.24k).
And also my PCB is 2 layer, One layer for components and other layet full ground.
It depend on your layout. Heating is a normal phenomenon for the 1.5A output current. Could you please share the layout file with us?
Boost DC/DC Solution
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In reply to Helen chen:
There is my PCB and SCH file. Boost_PCB&SHC.rar
In reply to Foras:
The hottest component will be IC, inductor and the diode. other component will not hot since they are not the power component. Please refer to the datasheet and the EVM board to pour more coppers for these power components.
The component dissipate thermal through the pad, so the big copper on the pcb board helps. And the cable is different with the pad, it is less effective for the power component's thermal dissipation.
Hi Helen, This is my new design can you check it? What do you think does it get hot ? Best Regards,
I made a small change based on your pcb. the diode to the IC, then to the Cout loop should be very small.
By the way, please redesign the pcb lib. Its thermal pad should be defined as pin 17 and it should be connected to PGND. Your current version lib the thermal pad can't help to dissipate the thermal because it can't conduct the heat out. pcb2.zip
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