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TPS62175 Step down converter : relation between input / output current

Adrien RIBEIRO
Prodigy 20 points
Other Parts Discussed in Thread: TPS62175

Hi,

My problem is the following, i use a step down regulator (see below for the reference), whos power by 21V on Vin and i would like to know which current is applied in input when i have a 58mA current in output and how to calculate this.

Thanks in advance.

Step down reference : TPS62175

L : 10uH

Rsw-fb : 1.1M

Rfb-pg : 180K

Best regards.

  • 0
    TI__Expert 5425 points

    The input power is equal to the output power divided by efficiency.

    I assume the 180k and 1.1M resistors are in the feedback divider. This would mean that your nominal output voltage is 5.7V, so your output power is 330mW. The datasheet (page 9, figure 5) shows an efficiency of 80% close to your operating condition. This means your input power must be in the range of 410mW. At 21V this means your input current is about 20mA.

  • 0 in reply to Juergen
    Prodigy 20 points

    Hi Juergen,

    You are right, 180k and 1M1 resistors are placed on the feedback.

    Thanks for your help.


    Regards.