TIDT346 august 2023
This design showcases a 1-A (1.5-A peak) output current nonsynchronous SEPIC converter based on LM51561, which covers an input voltage range of 6 V to 36 V with an output voltage of 12 V. The efficiency reaches up to 90.5% at 12-V input voltage. The design can operate down to 4.5 V to support automotive cranking.
The 2-MHz switching frequency allows the use of a smaller inductor and therefore enables a smaller circuit size.