LMS3635-Q1: About LMS3535-Q1

takahiko yokota

Mastermind 7135 points

Part Number: LMS3635-Q1
Other Parts Discussed in Thread: LMS3655-Q1,

Please let me ask you about LMS3635-Q1 or LMS3655-Q1.

1. Are there the conducted EMI data without the spectrum spread function

2. Are there the conditions to change form PWM to PFM?

Best regards,

Yokota

over 6 years ago

0 Ambreesh Tripathi over 6 years ago

TI__Expert 6860 points

Yokota-San ,

We will get back to you with condcted EMI results without Spread spectrum . Is there specific reason of not using Spread spectrum ?

Internally when the comp voltage falls to predetermined value , the device enters PFM mode and vice versa . The transition can easily seen on the Efficiency plot in Auto mode :

0 takahiko yokota over 6 years ago in reply to Ambreesh Tripathi

Mastermind 7135 points

Hi Ambreesh-san

Thank you for the reply.

My customer require that data to make a comparison with the device having the spectrum spread function.

Could I get the time taken to change from PWM to PFM?

Best regards,

Yokota

0 takahiko yokota over 6 years ago in reply to takahiko yokota

Mastermind 7135 points

Hi Ambreesh-san

I'm sorry to be pressing, but could I get the condcted EMI results without Spread spectrum?

Best regards,

Yokota

0 takahiko yokota over 6 years ago in reply to takahiko yokota

Mastermind 7135 points

Are there the PWM-PFM transition wave form like attached document about LMS3635-Q1 or LMS3655-Q1?

Best regards,

Yokota

0 Brani Dubocanin over 6 years ago in reply to takahiko yokota

TI__Expert 4100 points

Hello,
We will get back to you after Holidays, since most of the support engineers for this device are out this week.
Regards
Brani

0 Ambreesh Tripathi over 6 years ago in reply to takahiko yokota

TI__Expert 6860 points

Here is the EMI comparison of the device with and without Spread Spectrum in 30MHz to 108MHz range .

LMS3655_W&WO_SS.pptx

Here is the FPWM to PFM transition time data from the datasheet .

---Ambreesh

Power management

Power management forum

LMS3635-Q1: About LMS3535-Q1