TPS4H160-Q1: TPS4H160-Q1 EVM Junction-to-Ambient thermal resistance and full load performance

Gerald Steele

Part Number: TPS4H160-Q1

Do you have any information (measurements, simulation, or estimates) of the thermal resistance junction to ambient for the TPS4H160-Q1 EVM.

I'm curious as to whether it would support the following condition:

1. All 4 channels enabled with an 8 amp load on each

2. 24 volt supply

3. Will this supply a continuous output (no thermal limit or latch off)?

4. If it supports continuous operation, what is the maximum ambient temperature it can do it?

5. At a minimum if I have the thermal resistance spec for the EVM I can analyze and test to see what it will do.

0 Cameron Phillips over 6 years ago

Hello,

I can submit to get the effective theta JA of the EVM but this process takes 2 weeks to get back.

Also 8A is the minimum internal current limit of the device so it cannot do 8A continuous.

Also doing 10W of power dissipation of the device at a conservative estimate is way too much for this part to dissipate with any reasonable layout.

For 8A loads we recommend to use 8mOhm high side switch

0 Gerald Steele over 6 years ago in reply to Cameron Phillips

Quite right, I had not done the simple calculation of dissipation at 7.99A and 0.28 ohm Rdson which is over 17 watts

per channel. Very limiting indeed. Hope I find a good choice of switches at >8 mohm (I need current limit, thermal

limit, and latch off under those conditions).

Nonetheless it would be interesting to see how much power dissipation the EVM supports to determine

it's ultimate current capability.

I look forward the the thermal resistance calculation.

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