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42Vac flyback design query

IVAN FRIAS
Prodigy 30 points
Other Parts Discussed in Thread: LM5155, PMP40555, LM51551

Hello,

I need to design a Flyback converter with the following characteristics:

PARAMETERS

TEST CONDITIONS

MIN    NOM    MAX

UNIT

Input Characteristics

 

 

15               42            50

V

 

 

47                               63

Hz

Output Characteristics

 

 

11.75       15            12.25

V

 

 

                                   12

m

 

 

                1.5            1.62

A

 

Output voltage measured under 0 A a 1,5 A load step

11.75                        12.25

V

System Characteristics

Ƞ Max load efficiency

 

                85%

 

 working temp.

 

-30                            +70

⁰C

Could you recommend the driver that best suits my needs?

Thanks.

  • 0
    Prodigy 30 points

    sorry the table has not been copied correctly, I put it again:

    PARAMETERS

    TEST CONDITIONS

    MIN     NOM   MAX

    UNIT

    Input Characterstics

    Vin

     

    15               42               50

    V

    f line

     

    47                                  63

    Hz

    Output Characterstics

    Vout

     

    11.75           12          12.25

    V

    Vripple

     

                                          12

    mVpp

    Iout

     

                         1.5         1.62

    A

    Vtran

    Output voltage measured under 0 A a 1,5 A load step

    11.75                         12.25

    V

    System Characterstics

    Ƞ Max load efficiency

     

                       85%

     

    Working temp.

     

    -30                            +70

    ⁰C
  • 0 in reply to IVAN FRIAS
    TI__Expert 8210 points

    Ivan

    PMP40555 is an example reference design that is very close to your specification that meets your efficiency requirement.  It uses LM5155 as the primary flyback controller.

    Best Regards,

    Eric

  • 0 in reply to Eric Faraci
    Prodigy 30 points

    Hello Eric,

    The PMP40555 is almost closed to my specifications. The maximum input voltage of the PMP40555 is 60 volts. I need a maximum input voltage of 71 volts. 50x 1.414 = 71V.
    Do you know any driver that contains a higher input voltage range?
    In the design of the PMP40555, how is it possible to reach 60V input voltage? on the data sheet of the LM51551 specify a maximum voltage of 50 volts in "BIAS".
    Could I put a resistor on the input of "BIAS" to decrease the tension?

  • 0 in reply to IVAN FRIAS
    TI__Mastermind 46905 points

    hi Ivan,

    if add a circuit, such as zener, to limit the voltage of the bias pin below 50V, then I think the reference design can be up to 71V

  • 0 in reply to Jasper Li
    TI__Mastermind 46905 points

    Hi Ivan,

    I closed the post assuming you had solve the issue. if not, just reply below