TPS563202S: How to check thermal analysis for TPS563202S

Murali C

Part Number: TPS563202S
Other Parts Discussed in Thread: TPS563202,

Hi,

I have selected TPS563202SDRLR as buck converter for my application (i.e., Vin = 4.8 to 9V , Vout = 3.3 V , Iout = 0.5A maximum).

This IC thermal resistance is 137 deg C/W .

Tj = TA + (RthetaJA * Pd), here How to calculate the power dissipation? shall i take load current or leakage current?

How to do thermal analysis for this IC? (Pass/Fail)

Need to know, whether this IC suits to my application or not!!

Looking forward your response!

Thanks,

Murali

over 3 years ago

0 Young Zhao over 3 years ago

TI__Genius 9280 points

Hi ,

the Tj is around 32C based on 4.8v-9Vin-3.3Vout-0.5A loading @ 25 C.

You can check below Webench report for reference .

WBDesign170.pdf

If you want to estimate the Tj , you can get the eff based on Vin, Ivin,Vout,Iout ,

and Pd= Vin*Ivin-Vout*Iout - Pind

Pind is the loss on inductor , you can check this data from vendor's online tool , such as Murata or wurth . Or just taking DCR*IRMS^2 to approximate this value(not considering AC loss).

Then you can get the Tj=TA+ Pd*RthetaJA

BRs,

Young

+1 Jiandong Liu over 3 years ago

TI__Intellectual 1801 points

Hi Murali,

Power dissipation consist of conduction loss and switching loss of MOSFET, which is hard to calculate.

Here I suggest you can use WEBENCH simulation tool to evaluate TPS563202S thermal performance.

https://webench.ti.com/power-designer/switching-regulator/customize/18

As we don't have TPS563202S simulation model, the only difference between TPS563202S and TPS563202 is voltage accuracy, so you can use TPS563202 to evaluate thermal performance.

Below is simulation results:

Tj is only 37.23C, far below than 125°C maximum allowed junction temperature, which means IC won't have damage risk.

However, pass or fail a thermal analysis depends on your requirement on thermal, which have no uniform standard.

Regards,

Jiandong

0 Murali C over 3 years ago in reply to Jiandong Liu

Prodigy 170 points

Hi Jiandong,

Thanks

0 Young Zhao over 3 years ago in reply to Murali C

TI__Genius 9280 points

Hi ,

I will close this threat first, please let us know if you have further question .

BRs,

Young

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TPS563202S: How to check thermal analysis for TPS563202S