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OPA549: OPA549 question

Kailyn Chen
Genius 9560 points
Part Number: OPA549
Other Parts Discussed in Thread: OPA548, OPA188

Dear;

  About the "PROGRAMMABLE POWER SUPPLY" of  OPA549  datasheet Page12. I am not sure about the sink power supply, could you please describe it in detail?  Does it mean that if the load connected the output could be also source and caused the output higher than OPA549, so this means the sink, but the Ilim function of OPA549 could keep its output constant.  I am not sure if my understanding is right or not.

 

Best regards

Kailyn

  • 0
    TI__Guru* 93105 points

    Hi Kailyn,

    The OPA549 programmable power supply circuits shown in figures 9 and 10 are powered with V+ = 30 V, and V- = 0 V. In those designs the output is only capable of sourcing current to a load when that load is connected to ground. If the output load were connected to a positive voltage that is higher than the output voltage setting, then it would be possible for the output to sink current.

    If we view the programmable supply statement as more general terms, "A programmable source/sink power supply can easily be built using the OPA549. Both the output voltage and output current are user-controlled" a supply could be designed to sink, or source, or sink and source current. The design would have to accommodate the particular output requirements.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 140 points

    Thanks , Kailyn

    Hi，Thomas ，

    could you please help me check this circuit, Is that right to built a sink power supply?

    I need to simulate a battery ,the DUT include a power mannaged IC,。so I want to use OPA548/OPA549 to simulate charge and discharge like a battery ,to test the DUT power mannaged IC.

  • 0 in reply to Peng Qiu
    TI__Mastermind 23050 points
    Hi Peng,

    The design you have shown should be capable of sinking current based on the load the battery charger represents. As Thomas mentioned, since this is referenced to 5V and not ground, the output of the OPA548 should be able to sink the required current. Why have you chosen to include an extra buffer stage with the OPA188? If you are looking to obtain the dc precision of the OPA188 then you will want to use a composite loop, as shown in the following app note: www.ti.com/.../sboa002.pdf
  • 0 in reply to Zak Kaye
    Prodigy 140 points

    Thanks, Zak.，thank you for your help.