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TLV760: Turn-On Behavior (delay time) of the TLV76015

mdg1909
Prodigy 30 points
Part Number: TLV760
Other Parts Discussed in Thread: LP2951

Hi Guys,

I have a question about the TLV76015 Linear-Voltage Regulator. Is the Turn-On Time (delay time) between Voltage-Input to Voltage-Output about 5.5ms normal? I tried with different Output-Capacitances
from 100nF to 4,7µF - but there's no change in this start-up time. In the first 5ms there's a linear Voltage-rise up to 5V - after that, the voltage jumps to the endvalue of 15V. Voltage-Input ist about 18V.

Thanks for the answers

  • 0
    Prodigy 30 points
    Can I influence this behavior? I Need to reduce the turn-on time.
  • 0 in reply to mdg1909
    TI__Mastermind 23361 points
    Hi mdg1909,

    Will you please provide your complete schematic for me to review it?

    Regards,
    Jason
  • 0 in reply to Jason Song
    Prodigy 30 points

    Hi Jason,

    It is the typical application circuit described in the datasheet. I put a capacitance of 0,1µF between Input and GND and a capacitance of 0,22µF between Output and GND. There's nothing more. 18V Input-Voltage.

    For me, the turn-on behavior is important because I want to put this voltage-regulator in an IGBT-Driver-circuit to provide the upper Drivers with 15V. Because of the delay time I have the problem, that the IGBT's start to switch before the 15V are completely built up.

    I'd like to know if I have the possibility to influence this behavior by a hardware solution or if I need to change the software (to give the voltage-regulator more time to build up his output-voltage).

    Maybe - there are other line-regulators with a faster turn-on behavior?

    Regards,
    mdg1909

  • 0 in reply to mdg1909
    TI__Mastermind 23361 points

    Hi mdg1909,

    If you are okay with adjustable Vout, you can consider LP2951. There are some fixed 15V version LDO as well. As you did not mention your requirement, I just use 18V Vin, 15V fixed output and 100mA load to generate the following search results.

    You can also go this page and enter the filter conditions for the LDO search. 

    Please let me know if you need additional help. 

    Regards, 
    Jason Song