WEBENCH® Tools/LM2621: LM2621MM, please help to get stable 9V output.

Sergey Yarovoy

Prodigy 65 points

Part Number: LM2621
Other Parts Discussed in Thread: TPS61093, TPS61085

Tool/software: WEBENCH® Design Tools

Hi, everyone!

Please help me to configure parameters of LM2621MM to set up output voltage 9V.

I'l try to use Webench to solve my problem, but it wasn't success. :)

over 7 years ago

0 Zack Liu over 7 years ago

TI__Mastermind 34231 points

Hi Sergey,

What's the problem do you meet in Webench? Please tell me the input voltage range and output current?

Regards,
Zack

0 Sergey Yarovoy over 7 years ago in reply to Zack Liu

Prodigy 65 points

Input voltage 2.6V min, 4.2V max. And output current is around 150-200mAh.

0 Zack Liu over 7 years ago in reply to Sergey Yarovoy

TI__Mastermind 34231 points

When Vin=2.6V and Vo=9V, the duty cycle needs to be above 0.7 at CCM. LM2621 has a 0.7 duty cycle limit. That's the reason why webench cannot simulate your application. You can choose TPS61085 or TPS61093.

Regards,
Zack

Power management

Power management forum

WEBENCH® Tools/LM2621: LM2621MM, please help to get stable 9V output.