LM61460-Q1: Ipk_min of auto mode

Lee, Sam

Expert 6065 points

Part Number: LM61460-Q1

Hi team,

Can you explain more about the threshold to enter auto mode in LM61460-Q1 datasheet?

-. Why is the Ipk_min divided into two (Ipk_min0 and Ipk_min100)?

-. What is 25% or 12.5% based on?

-. Can you expain the meaning of Ipk_min_0 and lpk_min_100, and pulse duration of <100ns / >1us"?

Thanks,

Sam Lee

over 5 years ago

0 Arief Hernadi over 5 years ago

TI__Mastermind 23845 points

Hi Sam,

I will ask the application engineer for more information.

Thanks

-Arief

0 Marshall_Beck over 5 years ago in reply to Arief Hernadi

TI__Mastermind 35210 points

Hello Sam,

Glad to see you contact us over e2e :)

Ipeak min varies with duty cycle...not typical to some of our latest bucks, hence Ipeak min for 100% duty cycle and 0% duty cycle.

Typical values are given based on silicon distribution for given conditions and required operation range.

Ipeak min is often hit during pfm mode of operation. In this mode, we are not PWM so no effective duty cycle. So on time of high side is alias pulse durarition

0 Lee, Sam over 5 years ago in reply to Marshall_Beck

TI__Expert 6065 points

Hi Marshall,

Thank you for your reply.

I'd like to understand more clearly. Does the 25% means 25% x HS current limit curve as below? Or is it based on 25% x internal limit value?

Thanks,

Best Regards,

Sam Lee

0 Marshall_Beck over 5 years ago in reply to Lee, Sam

TI__Mastermind 35210 points

25% of rated current.

For LM61460-Q1: .25*6

Power management

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LM61460-Q1: Ipk_min of auto mode