TPS62824A: Inductor selection for forced-PWM operation

Hugo Van Reeth

Prodigy 10 points

Part Number: TPS62824A

Hello,

I am designing a Buck for PoL appliation, using the TPS64824A, and with the following parameters :

- Input voltage : 3V -> 5V

- Output : 1V, 1.2A max

- I want to use a forced-PWM mode configuration to get a low voltage ripple.

The inductor selection chapter is only giving a 470nH typical value for all applications, without any consideration of the PWM mode, and design parameters. According to the datasheet, the frequency is quasi-fixed at 2.2MHz in forced-PWM mode. Using generic Buck equations with all these parameters, I get a nominal inductor value close to 1µH.

Would you recommend to follow the datasheet values, or to adapt the typical design to usecase parameters ?

Thanks;

Hugo

over 1 year ago

+1 Excel Regidor over 1 year ago

TI__Mastermind 37531 points

Hi Hugo,

Thanks for reaching out to us.

TPS62824A is optimized to 470nH inductor to achieve a fast transient response. 1.0uH inductor can also be used to get a lower ripple voltage. However, you need to check the converter performance and control loop for any instability in actual application.

I hope I was able to address your query.

Best regards,

Excel

0 Excel Regidor over 1 year ago in reply to Excel Regidor

TI__Mastermind 37531 points

Hi Hugo,

Just a gentle reminder.

Do you have additional queries? If not, can you kindly click the "Resolved" button?

Thank you.

Best regards,

Excel

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TPS62824A: Inductor selection for forced-PWM operation