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Original question:

TINA/Spice/TPS40210: Departing from the operating TI model, I modified some parameters and the design doesn't work

TPS40210: How to decide RT and C value for SW frequency

Masayuki Uchihara
Intellectual 1686 points
Part Number: TPS40210

Hi Team,

I have questions and a request.

- Can you provide the Fsw formula by using RT formula on the datasheet section 7.3.5?

- When customer use 400kHz frequency, what combination is the best for their design in the minimum variation stand point?

- According to the figure 1 of the datasheet, we can see several Rt-C combination. In general, lower capacitance and resistance is less variation than bigger value. However,  the relation between Rt and C is like inverse proportion. Therefore we want to understand what the combination should be the best.

-  Does this device have pulse skip mode? If no, could you tell me the operation, when the on time is less than minimum pulse width?

Thanks,

Uchihara