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TIDA-00704: Using as a standalone charger

Gregory Duperon
Expert 6050 points

Part Number: TIDA-00704

I have a customer currently attempting to use the TIDA-00704 as a standalone charger (w/o MCU).

However, upon discharging battery and attempting to use the design for charging purposes, the design is not functioning as expected.

Two questions:

(1) Can the design be used as a standalone charger?

(2) Can you share additional collateral to assist with debug?

  • 0
    TI__Expert 3860 points
    Hi Gregory,

    This design can work as a CC/CV standalone charger, with CC and CV levels decided by the individual current and voltage loops built around U5. The MCU is used only for finer adjustments within this CC/CV super profile.

    My suggestion about the circuit not working with a discharged battery: The circuit contains an interlocking circuit that detects the presence of a partially discharged battery (the circuit around U2, Q6 & Q10). It will disable the UCC29950 if there is no battery present/battery voltage too low. If it is needed to operate the circuit without a battery connected, you can remove this circuit shown on sheet 4 of the schematic and shorting the emitter and collector pads of Q10 (R73 & C37 are to be populated).

    Regards,

    Salil
  • 0 in reply to Salil
    Intellectual 255 points
    Hello Greg and Salil,
    I have the battery attached to the charger, still the charger is not charging the batteries. I have the bulk voltage at 165Vdc and AC1 is 69 and AC2 at 65Vac. I was measuring 11.7 at U8 pin 3 but now I measuring 0
  • 0 in reply to Abed Yassine
    TI__Expert 3860 points

    Hi Abed,

    Sorry for the late reply - I am on travel from last week.

    It looks like you have a problem with the auxiliary supply. Are you using the auxiliary supply TIDA-00708 as indicated in the design guide? If not, you need to give external power supplies to both primary and secondary sides for the circuit to work. It does not use self start-up and bias. I think there can be a way to use this; but at the time we just used an auxiliary power supply we had at hand.

    Regards,

    Salil

  • 0 in reply to Salil
    Intellectual 255 points

    Hello Salil, 

    we are using the 708 reference design. the supply is providing the 12V to the main board. I can trace the 12V to U8 pin 3. I had a problem using the scope to check signals on the board. I was connecting the pgnd to the scope ground but that blue the fuse for me couple of times. I have the board repaired. It will be helpful if you can send me some troubleshooting tips so I can try to figure ou
  • 0 in reply to Abed Yassine
    TI__Expert 3860 points
    Hi Abed,

    Please use isolated scope (or isolated probe) while probing on the primary side of the PSU. For tracing the Vcc, you can use a multimeter also, as there are no signals to be checked. Please check the current drawn from aux. supply. Apparemntly it is collapsing or nor reaching the controller IC.

    Regards,

    Salil