TPS562211: with DFE322512F-4R7M

Hideki Hayashi1

Expert 7810 points

Part Number: TPS562211

Hi team,

Customer consider DFE322512F-4R7M inductor with TPS562211.

Is there any concern here?

Input voltage: 13.5~9V

Output voltage: 5V

Output current: 1A

Best regards,

Hayashi

over 1 year ago

0 Lucia Gao over 1 year ago

TI__Mastermind 22970 points

Hi Hayashi,

Thanks for reaching out. Could you please share me the spec/datasheet of DFE322512F-4R7M inductor? I will check for you.

Thanks!

BRs

Lucia

+1 Lucia Gao over 1 year ago

TI__Mastermind 22970 points

Hi Hayashi,

We checked the spec of this inductor, you can use it.

Thanks and kindly let us know any of your concern.

BRs

Lucia

0 Hideki Hayashi1 over 1 year ago in reply to Lucia Gao

TI__Expert 7810 points

Hi Lucia,

When customer uses DFE322512F-4R7M inductor, the low load efficiency is better than TMS322512ALM(higher DCR). (@ <0.6A area). Both are FCCM mode.

Why does the difference occur? Is it expected?

Regards,

Hayashi

0 Zixu Wang over 1 year ago in reply to Hideki Hayashi1

TI__Expert 8100 points

Hi Hideki,

I will check difference between two inductors and give you feedback soon!

BRs

Zixu

0 Zixu Wang over 1 year ago in reply to Hideki Hayashi1

TI__Expert 8100 points

Hi Hideki,

Does customer use TMS322512ALM-4R7MTAA? Since for TMS322512ALM, it is not specific part number of inductor and I could not know exact inductor value used in customer test. And could you please help to provide test data and measurements of customer in efficiency test? I would like to know how customer test efficiency.

If both inductors have same value of inductance, higher DCR would contribute to higher conduction loss and lower efficiency.

BRs

Zixu

0 Hideki Hayashi1 over 1 year ago in reply to Zixu Wang

TI__Expert 7810 points

Hi Zixu,

I confirmerd again, the TMS322512ALM inductor value is 6.8uH... Sorry for confusing.

The efficiency curve as below

Regards,

Hayashi

0 Zixu Wang over 1 year ago in reply to Hideki Hayashi1

TI__Expert 8100 points

Hi Hideki,

Since delta_IL is larger with 4.7uH, the switching loss would be higher than that of 6.8uH. Under light load condition, switching loss takes majority of loss and efficiency of 6.8uH circuit is higher than 4.7uH circuit.

BRs

Zixu

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TPS562211: with DFE322512F-4R7M