TPS54560B: How to calculate R esr = 1.67mΩ used in Equation 45 on page 30 and Equation 50 on page 31?

shiyota_sato

Part Number: TPS54560B

I'm using the translation function, so I'm sorry if the sentences are strange.

I'm thinking of making a DC60V→DC12V5A circuit referring to the design example DC60V→DC5V5A.

How was R esr = 1.67mΩ used in Equation 45 on page 30 and Equation 50 on page 31 calculated?

I thought I would use equation 35 on page 27, but I don't know the values that apply to V oripple and I ripple where Resr = 1.67mΩ.

Could you please teach me?

over 2 years ago

+1 Gui He over 2 years ago

TI__Mastermind 27276 points

You are right the equation(35) is used to calculate the ESR value we want, need to <15.7mΩ here. Then you choose your output capacitor and ensure the ESR value <15.7mΩ

Here you got a 1.67mΩ on your board ,which is <15.7, it's ok.

Then use this value to calculate the compensation network in equation(45) and (50).

Hope that helps.

Thank you

0 shiyota_sato over 2 years ago in reply to Gui He

Prodigy 10 points

1.67mΩ < 15.7mΩ, so it's okay! thank you very much.

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TPS54560B: How to calculate R esr = 1.67mΩ used in Equation 45 on page 30 and Equation 50 on page 31?