LM3489-Q1: About LM3489QMM / NOPB

Tomoyuki Taguchi

Part Number: LM3489-Q1
Other Parts Discussed in Thread: TPS65988

Is "ESR" in the calculation formula of the switching frequency the ESR of the output capacitor?
Also, the LM3489QMM / NOPB is used in the TPS65988 Evaluation Module. What is the switching frequency set at 5,9,15,20V?

over 2 years ago

0 Jimmy Hua over 2 years ago

TI__Mastermind 47060 points

Hi,

If you are referring to Equation 4 then the ESR is that of the polarized output capacitor.

I'd guess that the switching frequency would be 400kHz but let me reassign to the PSIL-PI group to have the appropriate apps engineer comment on what the internal switching frequency is.

Regards,

Jimmy