EVL400W-EUPL7

EVL400W-EUPL7 is a demonstration board for 12V - 400W converter, tailored for typical specification of an AC/DC adapter with wide input mains range, very low power consumption at light load and good average efficiency. The architecture is based on a 2-stage approach: a front-end PFC pre-regulator based on a CCM boost PFC controller using the L4984, and a downstream LLC resonant half-bridge converter, designed around the L6699. At the secondary side, synchronous rectification is implemented by means of the SRK2001 that assures a very high rectification efficiency with consequent small heat sink required. The main focus of this board is the light-load efficiency, achieved through the burst mode function of both PFC and LLC controllers with the self-adaptive deadtime of the L6699, modulated by the internal logic according to the half-bridge node transition times, which allows the maximization of the transformer magnetizing inductance, reducing the primary current at light load operation.

• 12V, 400W adapter based on L4984, L6699 and SRK200
• Universal input mains voltage range from 90VAC to 264VAC
• Output voltage of 12V at 33A continuous operation
• Average efficiency is greater than 89%, according to European CoC ver. 5 Tier 2 for external supply
• No load mains consumption less than 150mW at 230VAC well below European CoC ver. 5 Tier 2 limit
• Mains harmonics meets EN61000-3-2 Class-D and JEITA-MITI Class-D
• EMI according to EN55022 Class-B
• Safety meets EN60950 standards