LMR14030-Q1: Noise reduction by spread spectorum

tateo yamashiro

Part Number: LMR14030-Q1

Hi,

We got a question from customer about LMR14030-Q1.
Could you help us?

[Question]
How much is the reduction of emissions at higher harmonics which fall in FM band by the spread spectrum function? They would like to make sure the effect(it can reduce by xxdB.) by spread spectrum.

Best Regards,
tateo

over 7 years ago

0 Vental Mao over 7 years ago

TI__Expert 5745 points

No spread spectrum

With spread spectrum

Nearly 10 dB attenuation

0 Vental Mao over 7 years ago

TI__Expert 5745 points

No spread spectrum

With spread spectrum

Nearly 10 dB attenuation

0 tateo yamashiro over 7 years ago in reply to Vental Mao

Guru 10890 points

Hi, Sorry for the delayed reply. Thank you for your support. We have additional question. In your plot, we can see noise floor at low frequency range of 150kHz up to 500kHz. Why is the noise floor occurred? We wonder why the noise floor of the below switching frequency is occurred.

Best Regards,
tateo

0 Vental Mao over 7 years ago in reply to tateo yamashiro

TI__Expert 5745 points

It's really hard to say which cause this noise. Normally, it's caused by the unreasonable RC sbubber, or input cap is too small. If the noise during these frequency in your design, please use this way to debug them.
For us, the noise during these frequency don't cause some trouble , we don't pay more attention on it. Thank you!

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LMR14030-Q1: Noise reduction by spread spectorum