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TPS62362: Maximum output voltage when remote sense line has parasitic series resistance

Takahiro Saito
Expert 5315 points
Part Number: TPS62362

Hi team,

The datasheet specifies that the maximum output voltage is 1.4V for TPS62362.

If the remote sense line has a parasitic series resistance, can the device output up to specified maximum voltage(1.4V)?

 

The reason why I ask is when the Vout equals the specified maximum voltage(1.4V) in the below configuration, the voltage at the right after the LC filter should be higher than the maximum voltage (>1.4V). Is it violate the datasheet specification of maximum output voltage?

 

Regards,

Saito

  • 0
    TI__Expert 3645 points

    Hello,

    If you look in the abs max, it is not specified the max for the output voltage, but the voltage at the SW pin. In your schematic, you can neglect the Resr2 because connected to the sense line (high impedance). The Vout will be regulated at 1.4V thanks to the feedback at Vout; consequently, the voltage will be increased at the point where is connected C4 due to the compensation.

  • 0 in reply to Alfonso Furio
    TI__Expert 5315 points

    Hi Alfonso,

    Thank you for your answer. I have one more question about your answer.

    >The Vout will be regulated at 1.4V thanks to the feedback at Vout; consequently, the voltage will be increased at the point where is connected C4 due to the compensation.

    The voltage at C4 will exceed the maximum output voltage described in the datasheet. Could you make sure the condition is not out of spec?

    According  to your experience, how much voltage can the device output at maximum right after the L-C filter?

    Regards,

    Saito

  • 0 in reply to Takahiro Saito
    TI__Expert 3645 points

    Hello,

    at the point before c4 the voltage could be whatever. What is important (specified in the abs max) is the voltage directly connected to the pin of the IC. In normal condition the voltage increase/decrease due to the compensation of some mV.

  • 0 in reply to Alfonso Furio
    TI__Expert 5315 points

    Hi Alfonso,

    Thank you for your answer. The voltage increase at C4 will be 1.4V + 0.1V ~0.2V in my customer circuit.

    Based on your last answer, the device will normaly work in that condition. Is that correct?

    Regards,

    Saito    

  • 0 in reply to Takahiro Saito
    TI__Expert 3645 points

    Hello,

    This is due to the feedback on how discussed above. At the Vout, you should have 1.4V, and the device works fine.