TPS61194: How to calculate the power dissipation?

PYTsai

Genius 11495 points

Part Number: TPS61194

Would you share How to calculate the power dissipation?

In my application,

- there are 4 strings,

- each string has 9 LEDs (VF = 3.7V x 9 )

- Vin 9 ~ 16 V

- 90 mA per channel / string

over 5 years ago

0 Sean Zhou over 5 years ago

TI__Mastermind 22745 points

Hi Sir,

It is not easy to calculate the power dissipation since it may depends on the external component, such as LED, MOSFET. It is better to test the board, this is more real performance of the thermal.

Regards

Sean

0 PYTsai over 5 years ago in reply to Sean Zhou

TI__Genius 11495 points

Hi Sean,

I mean the power dissipation on TPS61194, can you help?

0 Sean Zhou over 5 years ago in reply to PYTsai

TI__Mastermind 22745 points

Hi sir,

The main power consumption cames from current sink and internal MOFET switching and conduction loss. You can refer to Figure 8 to estimate the power consumption on the current sink and refer to rdson of internal MOSFET to know the conduction loss of FET and you can also estimate the switching loss is same with conduction loss Add all together, you can know the power consumption of the TPS61194.

Regards

Sean

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TPS61194: How to calculate the power dissipation?