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dc/dcled driver ref

bar greidy
Intellectual 460 points
Other Parts Discussed in Thread: UCC28810, TPS40211, UCC28811

Hello,

We need your assistance in finding a simple and cheap ti led driver for the below configuration: Vin 13-18v, Vout 24v, Iout 1A, 1 led each to operate in dc mode. 

Please advice if we can use for that UCC28810? If so, please advice where we can find a DC-DC design reference close to our configuration?

(please discard the 10w offered design reference).

Thank you,

Barg

  • 0
    TI__Mastermind 25500 points
    For DC-DC with these specs a cheaper solution would be the TPS40211 boost controller. There is an EVM for it that is close to the specs you need, just a bit lower output current.
  • 0 in reply to Clinton Jensen
    Intellectual 460 points

    Hi Clinton,

    Thank you for your reply.

    please advice if possible to use the UCC28811 as it is significantly cheaper than TPS40211 ?

    our intention to use with UCC28811 only the dc layout, can this ic be use only for dc to dc?

    thanks,

  • 0 in reply to bar greidy
    TI__Mastermind 25500 points

    I am not extremely familiar with that device, but yes, you can do DC-DC with it. Most any AC-DC converter will run fine DC-DC.

  • 0 in reply to Clinton Jensen
    Intellectual 460 points

    Hi Clinton,

    Thank you for your reply.

    we need your assistance to advice where or to whom we can address to have a reference design for  UCC28811 using it for a dc to dc purpose, for example to a design:

    VIN=10V TO 16V, Vout =18V, I out =1A.

    Thank you,

  • 0 in reply to bar greidy
    TI__Mastermind 28655 points

    Hello,


    We would not have a reference design for that since it was intended to be an off-line PFC controller.  You could use it for DC-DC.  One issue to start with is the under voltage lockout, typical 12.5 volts, maximum 13.0 volts.  It will not start until it reaches this threshold.  Also it will reset if it drops below 9.7 volts, 10 volts maximum.  A diode and capacitor could be used to ride out dips but that will add even more to the ULVO start-up threshold.

    Is this isolated (flyback) or going to be a boost?

    Is this going to be a voltage output or current regulator?  I ask because this is from the LED driver portfolio.  This part was intended to regulate voltage (good for two stage designs).  It can regulate current but it takes a bit more design effort to do that.

    If there are surge voltages above 18 volts the input to the IC will also have to be protected.  I noticed 10-16 volts input, that seems like an automotive range.


    Thanks,