LMZM33602: Duty cycle of Buck-Boost topology

tateo yamashiro

Part Number: LMZM33602

Hi,

We got a question from the customer about LMZM33602.
Could you help us?

[Question]
They would like to know why the formula of duty cycle(equation 1 of SNVA800B) is established. Could you tell us how to prove equation 1?

Best Regards,
tateo

over 6 years ago

0 Denislav Petkov over 6 years ago

TI__Mastermind 19891 points

Hello Yamashiro-san,
Here is an app note going into more detailed calculations on inverting: www.ti.com/.../slva721a.pdf
Cheers,
Denislav

0 tateo yamashiro over 6 years ago in reply to Denislav Petkov

Guru 10890 points

Hi, Thank you for your support. They would like to know the reason why efficiency is related to Duty. Could you tell us how to prove this relationship?

Best Regards,
tateo

0 Jimmy Hua over 6 years ago in reply to tateo yamashiro

TI__Guru 50120 points

Hi Tateo,

You might be interested in this thread where I exchanged my reasoning with Niels about the efficiency factor in the duty cycle.

Please have a look over it. This might help explain why I included this efficiency factor.

Regards,

Jimmy

Power management

Power management forum

LMZM33602: Duty cycle of Buck-Boost topology