Precautions to be taken to implement a PWM dimming after a SEPIC converter ?

[JL34]

Hello,

I am looking to implement a PWM dimming between a SEPIC converter and a led string. What precautions have to be taken to make this ? Is there a simple and elegant way to do this ?

SEPIC output would be 48V with frequency between hundreds Khz to few Mhz. Converter is not yet chosen.
Led string current is 150mA.
PWM dimming frequency should be above few Khz.

Background :
I am trying to design a modular led lighting with those elements :
• A single power module with a SEPIC converter powering a 48VDC rail. With 12V-24V voltage input capability.
• Multiple leds modules connected to the 48VDC rail.
• Those led modules would have single or multiple led strings, with an OnSemi NSI (2pin Adjustable Constant Current Regulator) by string. I would like to add PWM dimming on those led modules.

This way, i could achieve en-lighting with constant voltage driving advantages (adding leds modules easily) and constant current driving advantages (fine brightness control and stable current across temperature variation).

Thanks in advance for your advice