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PMP20345: Dimmable Exit Light Design

uMin
Intellectual 860 points

Part Number: PMP20345
Other Parts Discussed in Thread: PMP20612

Hi,

One of my customer wants to work on a new Dimmable Exit Light Design. They are driving a string of LED at constant current.

The requirement as follow:

Input:  AC 230V

Output:  48V 180mA and 360mA (2 designs)

I checked and found this reference design (PMP20345), which is quite close to the requirement, except dimming control.

Is there an easy way to add in dimming control to this reference design ?

Or is there any other better solution to achieve the above requirement ?

Thanks and Regards,

CM.

  • 0
    TI__Expert 4840 points
    Hi,

    PMP20345 uses primary side regulation (PSR) controller. Its control law allow the current sensing signal to be used to perform constant current control. Since it is difficult to change the current sense resistor to adjust the peak current level to achieve dimming requirement, I think it is better to use Flyback converter with secondary side regulation (SSR) controller and provide current control signal from secondary side. PMP20612 DC-DC stage can be an example.