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TPS27081A: case : fastest Raise time of VOUT

Motoyasu Hattori
Genius 9025 points
Part Number: TPS27081A

Hi,

For fastest Raise time of VOUT, what value of R1 is setting? Please let us know.

Also, on this case, Please let us know the Fall time and ton/toff value.

Thanks and best regards,
M.HATTORI.

  • 0
    TI__Genius 13650 points

    Hi Hattori,

    The rise time is dependent of the resistor placed on the R2-pin, and the capacitor between the R1/C1 pin and VOUT. To achieve the fastest rise time tie R2 pin directly to ground and do not put a capacitor between R1/C1-pin and VOUT. This configuration will get you a rise time of 250ns which is not dependent of R1. A typical recommended value used for R1 is 10kohms. The fall time of the device would be dependent of the output capacitance and the load. Once the device is disabled the voltage on the out during the fall time will the voltage on the capacitor as it discharges to the load.

    Best regards,

    Andy Robles