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Original question:

WEBENCH® Tools/TPS65268-Q1: Webench can't support TPS65268-Q1?

TPS65268-Q1: Efficiency calculation

Shinji Tsuji
Genius 14149 points
Part Number: TPS65268-Q1
Other Parts Discussed in Thread: TPS65263-Q1

Hi team,

Could you give me the efficiency of TPS65268-Q1 at following condition?

It looks there is no EVM nor webench support, correct?

1. BUCK1

Vin=5V, Vout=3.3V, Fsw=2MHz

2. BUCK1

Vin=5V, Vout=2.2V, Fsw=2MHz

3. BUCK2 and BUCK3

Vin=5V, Vout=1.8V, Fsw=2MHz

regards,

  • 0
    TI__Expert 7520 points

    Hi Tsuji

    TPS65268-Q1 shares the same die with TPS65263-Q1. The only difference is the datasheet where the input voltage tolerance is a little bit different. So you may use the EVM of TPS65263-Q1 (no webench). 

    To get the efficiency, would you please tell me the load current, the inductor and the output capacitor?

    BR

    Ruby

  • 0 in reply to Ruby Li
    TI__Genius 14149 points

    Hi Ruby,

    Could you measure following condition? efficiency of BUCK2 and 3 should be same, correct?

    #1.BUCK1　VIN=5V, Fsw=2MHz, Vout=3.3V
        inductor 2.2uH Iload min 837mA typ 1.15A max 1.56A
    #2.BUCK1　Vin=5V, Fsw=2MHz, Vout=2.2V
        inductor 2.2uH Iload min 667mA typ 1A max 1.5A
    #3.BUCK2 Vin=5V, Fsw=2MHz, Vout=1.8V
        inductor 2.2uH Iload min 667mA typ 1A max 1.5A
    #4.BUCK2 Vin=5V, Fsw=2MHz, Vout=1.8V
         inductor 15uH Iload min 147mA typ 196mA max 256mA
    #5.BUCK2 Vin=5V, Fsw=2MHz, Vout=1.8V
        inductor 22uH Iload min 67mA typ 100mA max 150mA

    regards,

  • 0 in reply to Shinji Tsuji
    TI__Expert 7520 points

    Hi Tsuji

    Yeah, you are right. I will measure the efficiency and feedback to you.

    BR

    Ruby

  • +1 in reply to Ruby Li
    TI__Genius 15135 points

    Hi, Tsuji -san 

    Please find the efficiency data in the below. 

    For the #4 and #5, suggest using 2.2uH inductor. 

    #1.BUCK1　VIN=5V, Fsw=2MHz, Vout=3.3V
    inductor 2.2uH Iload min 837mA typ 1.15A max 1.56A
    837mA： 95.49%
    1.15A： 94.65%
    1.56A： 93.06%

    #2.BUCK1　Vin=5V, Fsw=2MHz, Vout=2.2V
    inductor 2.2uH Iload min 667mA typ 1A max 1.5A
    667mA： 92.02%
    1A： 90.32%
    1.5A： 87.21%

    #3.BUCK2 Vin=5V, Fsw=2MHz, Vout=1.8V
    inductor 2.2uH Iload min 667mA typ 1A max 1.5A
    667mA： 91.57%
    1A： 89.84%
    1.5A： 86.67%

    #4.BUCK2 Vin=5V, Fsw=2MHz, Vout=1.8V 
    inductor 2.2uH Iload min 147mA typ 196mA max 256mA
    147mA： 91.19%
    196mA： 91.96%
    256mA： 92.2%

    #5.BUCK2 Vin=5V, Fsw=2MHz, Vout=1.8V
    inductor 2.2uH Iload min 67mA typ 100mA max 150mA
    67mA： 88.86%
    100mA： 90.41%
    150mA： 91.2%

  • 0 in reply to Zhao Ma
    TI__Genius 14149 points

    Hi Zhao,

    Thank you for your help!

    regards,