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

franck morisseau

Other Parts Discussed in Thread: PTN78020W

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.

over 12 years ago

0 Tom Guerin over 12 years ago

TI__Mastermind 38230 points

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

0 franck morisseau over 12 years ago in reply to Tom Guerin

Prodigy 130 points

Thank you for this answer.

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

0 Tom Guerin over 12 years ago in reply to franck morisseau

TI__Mastermind 38230 points

The PTN78020W is not recommended in a constant current application.

Tom

0 franck morisseau over 12 years ago in reply to Tom Guerin

Prodigy 130 points

Ok thanks Tom.

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

0 Tom Guerin over 12 years ago in reply to franck morisseau

TI__Mastermind 38230 points

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

0 franck morisseau over 12 years ago in reply to Tom Guerin

Prodigy 130 points

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