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LM5117: more than 80V part like LM5117

Pankaj Misra
Prodigy 40 points
Part Number: LM5117
Other Parts Discussed in Thread: LM5146, LM5145, LM5116

Looking for IC like LM5117 but with higher voltage range (80V and above)

Hi i am looking for PWM controller with integrated driver for following specs:

Vout : 24V, 6A with constant current limit mode of 6A when overloaded .(kind of CVCC)

Vin: 42V to 60V ( min 80 V required for derating point of view).

any part with min component for designing 48V to 24V converter with  CVCC option possibel.

Thanks

Pankaj Misra

  • 0
    TI__Guru 73072 points

    Hi Pankaj,

    Take a look at the LM5145 75V and LM5146 100V controller family. This will need an external circuit for brickwall current limit at 6A (CV-CC).

    Note there is an application example in the LM5145 datasheet for a 24V output.

    Regards,

    Tim

  • 0 in reply to Timothy Hegarty
    TI__Guru 73072 points

    By the way, a current-mode controller is easier to implement from a CV-CC standpoint. Take a look at the LM5116 100V controller as well.

    Regards,

    Tim

  • 0
    Prodigy 40 points

    LM5145 does not have Pgood like signal for making decision. Also if i want to implement external CC,CV then i have to use internal error amplifier as buffer. will it work any proven circuit with LM5146? 

    Another question about the current limit that for 13A current limit Rlimit value comes as  ( (13-1.7)*10mohm (Rdson)/(.2mA) (as per datasheet 200uA Ilim)=565ohm whether my understanding is correct ? as calculates excel value is 562ohm in TI tool.

    Also by chance hiccup mode can be made off so that if i manage with thermally at current limit then i don't need  constant current implementation let's say at 6A. 

    Thanks

    Pankaj Misra

  • 0 in reply to Pankaj Misra
    TI__Guru 73072 points

    Pankaj,

    Pin 10 of the LM5145 is PGOOD. In general, hiccup mode cannot be disabled. I recommend using the LM5117 for CC-CV as it has the CM pin. The LM5146 being voltage mode is tricky to compensate with both CV and CC loops, hence our preference for current mode (LM5117 in particular). See app note lit # SNVA829 for more detail.

    Regards,

    Tim