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TLE2426: Voltage follower to increase sink/source current?

Roland Melad
Intellectual 1185 points
Part Number: TLE2426
Other Parts Discussed in Thread: OPA548

Hello, 

Our customer needs your help on below:

i am currently designing an op amp circuit and use a tle2426 for virtual ground. But i need to source/sink more current through the virtual ground than the tle2426 can supply. Can i simply add a powerful op amp configured as a voltage follower after the tle2426 to solve this Problem? if yes, which one of your power op amp would be best suited for this application? I need about 1A sink/source capability. 

Regards,

Roland

  • 0
    TI__Guru* 93105 points

    Hello Roland,

    Adding a power Op amp buffer should provide the sink/source output current that is needed. The OPA548 is capable of output currents up to 5 Amperes so it will easily handle the 1 Ampere load current.

    I guessed at how you intend to set up the TLE2426, and then added the OPA548 as a buffer after the TLE2426. Below you can see a TINA schematic for a TLE2426/OPA548 supply splitter/power buffer idea. You can modify the circuit as needed for the application. Here is where you can find the OPA548 datasheet:

    I have also attached my TINA simulation file should you want to evaluate the circuit:

    OPA548_TLE2426_Buf_01.TSC

    Regards, Thomas

    Precision Amplifiers Applications Engineering