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LM2679: LM2679:

david sun1
Intellectual 320 points
Part Number: LM2679

Dear Expert of Power Design

We are using LM2679 to drive a TEC module, the resistance of the TEC is at the 1-ohm range, but not a consistent number, so we set the output voltage high, in the design is close to 10V.  we use the current limit feature of LM2679 to limit the output to around 6A. it works fine for quite a while. but recently, we notice that the system has special noise correspond to the TEC on. 

assume are drive the R125 to 1.21V.

Will this kind of application expect higher noise than the standard(no current limit trigger) usage?

Is this kind of design recommended? 

are there any other downsides using the current limit in regular working conditions. 

Thanks,

  • 0
    TI__Mastermind 27470 points

    Hi:

    The OCP function protects the device not be damaged in over current condition. It is internal trigged by comparator so it is quick but not so stable.  When the current in normal statues, the output is adjust by opmap which is a stable system. 

    so we don't suggest you long time work at fault condition of device, and you also need pay attention the L2's rated current and saturation current higher than OCP value though it may saturation at OCP condition may damage the circuit.

    Thanks

    Daniel Li