TPS5420.TPS5410

Gary Norris

Other Parts Discussed in Thread: TPS5420, TPS5410

Do the TPS5420 and TPS5410 need a heat sink at there maximum current. My design used 3 TPS5420 and 1 TPS5410. So far during testing the resistors just get hot but the chips seem fine?

Thanks

over 11 years ago

0 JohnTucker over 11 years ago

TI__Guru**** 191445 points

The TPS5410 and TPS5420 do not normally require heat sinks. For our dc/dc converter products, we usually provide an exposed thermal pad at the bottom of the IC for heat dissipation. TPS5410 and TPS5420 do not have that feature. They are mainly targeted for higher input voltages that typically operate at lower duty cycles, so the external catch diode will usually dissipate more power than the internal switching FET. But of course it depends on your application.

You say the "resistors" get hot. Which resistors are you referring to? The feedback resistors should not be dissipating much.

0 Gary Norris over 11 years ago in reply to JohnTucker

Intellectual 300 points

Sorry I meant load resistors not the feedback resistors. I am supplying between 5.5 and 8.4 volts. I am outputting 5, 4.1 and 3.3 volts?

0 JohnTucker over 11 years ago in reply to Gary Norris

TI__Guru**** 191445 points

Those are relatively high duty cycles, but you should be ok as long as your ambient temperature is not too high. If you are using resistors as a load I would expect them to get hot, depending on the wattage rating.

0 Gary Norris over 11 years ago in reply to JohnTucker

Intellectual 300 points

Thanks so I dont need heat sinks

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TPS5420.TPS5410