Datasheet

AN3172 Main characteristics and circuit description
Doc ID 17230 Rev 1 5/31
1 Main characteristics and circuit description
The main features of the SMPS are:
● Universal input mains range: 90÷264 Vac - frequency 45 ÷ 65 Hz
● Output voltage: 19 V at 4.75 A continuous operation
● Mains harmonics: Acc. to EN61000-3-2 Class-D or JEITA-MITI Class-D
● Standby mains consumption: <0.3 W at 230 Vac
● Efficiency at nominal load: Better than 90 % at full load
● EMI: According to EN55022-Class-B
● Safety: According to EN60950
● Dimensions: 65x151 mm, 25 mm component maximum height
● PCB: Double side, 70 µm, FR-4, Mixed PTH/SMT
The circuit is composed of two stages; a front-end PFC using the L6563H and an LLC
resonant converter based on the L6599A.
The PFC stage works as the pre-regulator and powers the resonant stage with a constant
voltage of 400 V. The downstream converter operates only if the PFC is on and regulating its
output voltage. In this way, the resonant stage can be optimized for a narrow input voltage
range, improving the efficiency and the primary side power components.