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TPS92310-12FB: Does TPS92310-12FB EVM can support Triac dimming control?

Jason Chien42
Expert 1180 points

Part Number: TPS92310-12FB

Dear Sir:

              Does TPS92310-12FB EVM can support  AC TRIAC dimming control? 

Best Regard

Jason

  • 0
    TI__Mastermind 25500 points

    Hello Jason,

    Our expert is out until Monday, but there may be. I will forward this to him and look into it. I hope to have an answer for you soon.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    TI__Mastermind 28655 points
    Hello Jason,

    TPS92310-12FB was not set up for triac dimming, it was set up for small form factor. It can be made to dim, see PMP8012 but may not be the best part for your application. What are you trying to design?

    Regards,
  • 0 in reply to Irwin Nederbragt
    Expert 1180 points

    Dear Sir:

                   We want to used TPS92310 to design indoor lighting and we want  it can support AC90~130 input and DC20~45V output (32mA , 13W), BTW , Can I modify TPS92310-12FB to meet PM6013 for Triac dimmable AC-DC LED driver?

    Best Regard

    Jason

  • 0 in reply to Jason Chien42
    TI__Mastermind 28655 points

    Hello Jason,

    Yes, it can be modified to triac dim however you may not be able to get 13W from that design, transformer and certain component limits.  I assume you mean 320 mA not 32 mA?  45V * 320 mA = 14.4W.

    You will have to add the input resistor that needs to be able to handle continuous pulses since it will be charging the EMI and damper capacitors when the triac fires.  This is R2 on PMP6013.  The value and power dissipation will depend on the EMI capacitor values, damper capacitor value and output power.

    You will also need the damper circuit, R1 and C1 to keep the triac from mis-firing.  (the values will depend on your power level and EMI capacitor values

    Then you will have to add the Compensation circuitry, R22, R24, C13, Q2 and R17.  This may need tuning to the dimming performance you desire.

    This is an open loop dimming circuit so changes in line voltage will show up in the light output.

    Regards,

  • 0 in reply to Irwin Nederbragt
    Expert 1180 points

    Dear Sir:

                         Thanks for your help.

  • 0 in reply to Irwin Nederbragt
    Expert 1180 points

    Dear Sir:

                Due to our U.S customer have requirement of PE>85% & PF>95% for AC to DC triac dimming control and our competitor is LTC LT3799 , It can meet both conditions as PE>85% & PF>95%(at AC120V,Vout=33~34V,vout current=320mA) , If we want to replace LT3799 , customer hope we can confirm TPS92310 can meet same specification , Does TPS92310 can meet this specification? or TI have another solution can do that? BTW , If used different Traic , does it will have different influences?(LUTRON-PD-6WCL / LUTRON-DVEL-300P / LUTRON-CT-603PG).

    Best Regard

    Jason

  • 0 in reply to Jason Chien42
    TI__Mastermind 28655 points
    Hello Jason,

    The two parts should have similar results if they are set-up the same way. The power factor drops because of the EMI capacitor and Damper capacitor, they should be similar values between the two parts. They are both isolated PFC flybacks so they should operate similar.

    Triac dimmers can be quite different in how they operate. There will be some dimmers that it will just not work with but that would be true with other drivers as well. Some require more holding current than the LED drive uses, this is a bigger concern at 230 VAC. The triac dimmers you mention are common ones, I have used one if not more of them.

    Just like with the competitor's part they will have to determine if the design works with the dimmers they chose.

    Regards,
  • 0 in reply to Irwin Nederbragt
    Expert 1180 points
    Dear Sir:
    As I know. LT3799 through VIN_SENSE pin to detect voltage to control dimming. and TPS92310 is through COMP to detect frequency to control dimming , right . What's different in this kind of application?

    Regards

    Jason
  • 0 in reply to Jason Chien42
    TI__Mastermind 28655 points
    Hello,

    The TPS92310 wasn't originally designed for triac dimming capability so it doesn't have a dim input. Dimming is controlled by adjusting the comp voltage. It is an open loop dimming method which works fine and should work similar to the other part performance wise.

    Regards,
  • 0 in reply to Irwin Nederbragt
    Expert 1180 points

    Dear Sir:

                  If customer prefer Vout ranger is 21~39 VDC , How to select T1(to modify PMP6013.1)? BTW, I found calculator on TI website as below but , it seem have limit with LED quantity. Can you help us for this issue?

  • 0 in reply to Jason Chien42
    TI__Mastermind 28655 points

    Hello,

    If you plan on using this with 21-39 volt output as one design and triac dimming you will probably need to add a voltage regulator to the primary bias winding because the range gets too large for VCC.  The Wurth transformer 750341087 isn't too far off from a turns ratio standpoint though it is probably too small for your higher power.  This will be a custom transformer, Wurth can make it to your design requirements, or some other manufacturer you can work with.

    If the secondary winding and primary bias are the same turns ratio then VCC would run from about 21 to 39 volts, lower when you triac dim.  39 is too high and why you would want to put a voltage regulator on the primary bias winding (a resistor, zener and transistor or MOSFET).  If you picked 1:0.8 then 21 volt output would leave 16.8V on the primary bias and when triac dimming it would not have enough voltage to stay on.  I picked 5:1 for the primary to secondary winding, it can vary depending on which power components you wish to use.

    The tool is limited in what you can do with it, I set it close to what you are looking for:

    I would go through the datasheet equations for all operating points to make sure it works as desired.

    Regards,