SNVAA88 December 2023 LM51581-Q1 , TPS1H000-Q1 , TPS92642-Q1
The high-side switch is placed between the boost converter and the LED driver and buffer capacitor. The high-side switch limits the output current of the boost converter and thus also the PoC current on the input side. This makes sure that the current rating of the components on the PoC side is not exceeded.
The procedure to determine the minimum current limit for a given LED configuration is described in the Design Steps section.
The design uses the TPS1H000-Q1 high-side switch due to the adjustable current limit and small size.