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PTN78020 as high power variable current source (or other POL module)

Hi all.

i would like to know if it's possible to use a PTN78020 or other POL module like PTH1206 as a variable current source to powering high power leds with analogic modulation from 0 to 100%.

the system use the POL and sense the output current by a high side resistor and with operational amplifier fed back to the voltage trim of the module.

if it's possible do you know what is the maximum modulation frequency for this application?

thank you for your help.

 

 

 

  • The power modules inclduign the PTN series cannot be frequency modulated . The design does not support this type of LED control.

  • In reply to Tom Guerin:

    Thank you for this answer.

    and it's possible to have only a high current constant source without modulation?

  • In reply to franck morisseau:

    The PTN78020W  is  not recommended  in a constant current application.

    Tom  

  • In reply to Tom Guerin:

    Ok thanks Tom.

    And other modules can do this job or all the POL range can't work in CC mode?

     

  • In reply to franck morisseau:

    Hi Franck:

    I would need to know what the current required requirement is and the range?

    Tom

    Can you send me direct e-mail so I call you and discuss this application?

    tguerin@ti.com

  • In reply to Tom Guerin:

    the current is between 0 and 2.5A for this application and 1.5v@35A for another one (with PTH12040WAH) using high power watercooled laser diode array.

    i 've sent a mail to you..

    greetings

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