LP87524B-Q1: Spread Spectrum details

Masatoshi Oguri

Expert 4780 points

Part Number: LP87524B-Q1

Hello,

What is the specific modulation frequency and spread deviation of the spread spectrum switching?

I mean information such like Fsw/1000 and +/-3% for example.

Thank you.

Regards,

Oguri

over 7 years ago

0 Nastasha over 7 years ago

TI__Genius 10000 points

Hi,

Thank you for using E2E. I have assigned this thread to someone who can provide this information. You should hear from him shortly.

Regards,
Nastasha

0 Tomi Koskela over 7 years ago

TI__Genius 11020 points

Hello Oguri-san,

The spread spectrum function has 325kHz total modulation range, so the switching frequency could be +/- 163kHz.

Thanks.

Regards,

Tomi Koskela

0 Masatoshi Oguri over 7 years ago in reply to Tomi Koskela

TI__Expert 4780 points

Hi Timi,

Thanks.

But I also need the modulation frequency.

I mean how frequent it repeats from hight to low back to high.

Oguri

0 Tomi Koskela over 7 years ago in reply to Masatoshi Oguri

TI__Genius 11020 points

Hi Oguri-san,

The frequency change is pseudo random, so you won't see periodic change of the frequency. In another words it is not modulated with sine wave with certain frequency.

Thanks.

Regards,

Tomi Koskela

Power management

Power management forum

LP87524B-Q1: Spread Spectrum details