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LM25085 Constant Current MODE ,Possible ?

user4467671
Prodigy 40 points
Other Parts Discussed in Thread: LM25085

Hello，Can  I use LM25085 like as below  for CCM of buck  ? Please help  me this question .






  • 0
    TI__Intellectual 2320 points

    Hello,

    You can use the LM25085 for constant current source LED driver operation. However since you are using multiple output capacitor it would make sense to add to a Type 3 ripple injection in your schematic. The LM25085 is a constant on-time (COT) part and the part needs external ripple at FB pin for nominal operation.

    Check out the LM3485LED eval for more information. Here we have used a CFF capacitor for more ripple injection at the pin. However, this type of ripple injection makes sense since we are using a Type 1 (one output capacitor in series with an external ESR) type of ripple injection.

    Regards,

    Sourav. 

  • 0 in reply to Sourav.Sen
    Prodigy 40 points
    Dear Sourav,
    Thanks for your reply ,I would try 2 control way as you mentioned. Thanks

    Regards

    John.