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TLE2426 Rail Splitter circuit

Other Parts Discussed in Thread: TLE2426

Hello, 

I plan using TLE2426 as a rail splitter in a OTA single supply application.

When I sim the schematic, there is no obvious problem.

However, I have 2 concerns :

1° What about the PSU bypass capacitors ?

Should they be placed from PSU to ground ONLY or from PSU to Virtual Ground AND from Virtual Ground to Ground ?

2° What about the current limitation of the TLE2426 ?

According to the sim, there is no issue, almost no DC current, if that is true, the only current to take into acount would be AC, which, in my application is ok (+/- 2mA) 

Jean

  • Hello Jean,

    Regarding your questions:

    1° What about the PSU bypass capacitors ?

    Should they be placed from PSU to ground ONLY or from PSU to Virtual Ground AND from Virtual Ground to Ground ?

    The TLE2426 has a low output impedance at dc and low ac frequencies. Typically, it is on the order of 0.0075 Ω. As frequency is increased that impedance will increase. If one wants to maintain a low virtual ground impedance with increased frequency adding a capacitor from the pin to system ground will help reduce the impedance. If the TLE2426 is being used to provide the positive supply for a lower voltage device it will likely be driving the power supply bypass capacitor for that device. However, if one wished to dynamically exercise the TLE2426 output as seen on the first page of the datasheet and below adding the capacitor can affect the Vo in which case it may be desirable to leave it out.

    The TLE2426 in the 8-pin package has a noise reduction pin where a capacitor can be added for the purpose of reducing noise in which case may eliminate the need for one on the output.

    2° What about the current limitation of the TLE2426 ?

    According to the sim, there is no issue, almost no DC current, if that is true, the only current to take into acount would be AC, which, in my application is ok (+/- 2mA) 

    Regardless of what the TLE2426 simulation model indicates in terms of operating current the datasheet Electrical Characteristics table indicates a maximum supply current of 300 uA. That is the current the TLE2426 needs to function. Any current that the load connected to the OUT pin requires will come from the IN pin which sources the current. The TLE2426 will source current up to its maximum capability limit.

    Regards, Thomas

    Precision Amplifiers Applications Engineering