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tps92210

yeshwanth kumar uppala
Prodigy 105 points
Other Parts Discussed in Thread: TPS92210

Dear Sir,

   I was working tps92210 IC for flyback non dimmable driver,i was facing problem in no load protection, please let know on what pins of IC i need to work on

  • 0
    TI__Mastermind 28655 points

    Hello,

    I am assuming you are using an opto-isolator for current feedback and are looking to protect in case of open LED.  If this is the case then an additional circuit added to the secondary side (LED side) that uses the output voltage to feedback when it gets too high can be designed. 

    This can also be done on the primary side via the bias supply voltage but the transformer leakage inductance needs to be taken into account (this can be solved with a small resistive load across the LEDs)

    Example:  LED stack is 30 volts.  A voltage monitoring circuit would take over at around 35 volts to drive current through the opto-isolator so the secondary side starts regulating voltage since the current regulation is no longer working.  This can be done through the same opto-isolator (as an or-ing function) or a separate opto-isolator.

    Depending on how the TPS92210 is set-up there may still need to be a minimal resistive load or zener type clamp on the secondary side to prevent the output from creeping up.

  • 0 in reply to Irwin Nederbragt
    Prodigy 105 points
    Firstly thanks for your reply sir, i was worked on tze pin resistors i.e., Rtze1 and Rtze2 resistors also as you mentioned zener clamp across output capacitor and we achieved the no load protection. Also, i have doubts regarding triac dimming can u share u email ID i have few doubts in implementing triac dimming using tps92210
  • 0 in reply to yeshwanth kumar uppala
    TI__Mastermind 28655 points
    Hello,

    Let me know what your dimming concerns are and what power, input voltage and any other important information you have.

    Thanks,
  • 0 in reply to Irwin Nederbragt
    Prodigy 105 points

    Output Power for 12,15,18W ,

    Input voltage 180-265V,

    Basically we want to work on tps92210 only for that we have seen application note pmp6003, but can you please help me out in starting up the project, triac dimming by determining dimming angle

  • 0 in reply to yeshwanth kumar uppala
    TI__Mastermind 28655 points

    PMP6003 is using D6 (and associated circuitry) to decode the dimmer angle.  This can be done many ways but this is a good way to prevent needing another opto-coupler.  It is decoding whether or not input voltage is present by watching the forward voltage through the flyback transformer (it's a negative voltage).  Basically it reduces current (via the feedback loop) as the dimmer is turned down.  There is also a loading circuit, U3 connect to Q2 that aides when dimming to keep the triac from misfiring and allowing for deeper dimming. 

    On the input, C1 and R5 are important to keep the input current from ringing negative when the triac fires.  If it rings negative for a long enough time the triac will shut off.  This will result in flickering.  C1 and R5 are a damper for C29 and also for L2 and C9.  C1 is large enough and R5 allows for enough current to latch the triac as well during the triac firing time.  For even better interface to the triac dimmer, F1 can be changed to a UL rated fusible resistor anywhere from 22-68 ohms depending on power level and efficiency loss desired.

  • 0 in reply to Irwin Nederbragt
    Prodigy 105 points
    Thanks for sharing the technical stuff sir, Also can you please give me the design consideration of triac dimming using tps92210.
  • 0 in reply to yeshwanth kumar uppala
    TI__Intellectual 2540 points

    This might help...sorry if it plays fast.  You can stop it as it goes.

    John

  • 0 in reply to John Perry
    Prodigy 105 points

    Thank you very much for sharing the video Sir,

    But i need design file of tps92210 for triac dimming

  • 0 in reply to yeshwanth kumar uppala
    TI__Mastermind 28655 points
    Not sure what you are asking for. There are design equations for the TPS92210 in the datasheet. There are triac dimmable EVMs available and a reference design with schematic and BOM.
  • 0 in reply to Irwin Nederbragt
    Prodigy 105 points

    Sir,

       I am doing my academic project in company so i want to knew about the design consideration, so am asking the mathcad file of tps92210 for triac dimming

  • 0 in reply to yeshwanth kumar uppala
    TI__Intellectual 2540 points
    There is no Mathcad file for the TPS92210. The only remaining piece of collateral not mentioned is a design calculator spreadsheet. You can find it here: www.ti.com/.../sluc242

    What information do you feel is missing with regards to designing with TPS92210? In other words, what contents do you expect to see in a design consideration document or Mathcad file which we have not been able to help you with so far?

    John
  • 0 in reply to John Perry
    Prodigy 105 points

    OK Sir, As of knowledge purpose i want to know the design of closed loop circuits

  • 0 in reply to yeshwanth kumar uppala
    TI__Mastermind 28655 points
    On PMP6003 the control loop is on the secondary side, U5 is the main loop regulating current. The bandwidth has to be below the line frequency to maintain power factor correction so response time is slow.

    The triac dimming signal is a reference to the loop, the circuit around U4 which feeds the (+) input to U5 (this is the reference voltage that can be adjusted by the sensed dimming circuit).

    U3 is a loading circuit to make the deep dimming perform better.
  • 0 in reply to Irwin Nederbragt
    Prodigy 105 points

    Thanks for your reply sir, thank you very much