This is a compact, 30-V DC, 400-W reference design for avionics applications that works with mains frequency between 400 Hz and 800 Hz. A two-phase interleaved transition mode (TM) power factor correction (PFC) based on UCC28064A is used to correct power factor and minimizes harmonic content of input current. The DC/DC is implemented using the HB-LLC stage with UCC256404. Efficiency is further improved by using synchronous rectification on the secondary side.
          Features
          
          
- Overall efficiency of > 92% at full load with 92.8% peak efficiency
 
- High power factor > 0.99, meets PFC regulations and current THD for DO-160 avionics requirements
 
- ZCS avoidance feature and OVP sensing feature in LLC controller improve robustness and protect systems from overcurrent, short circuit and overvoltage to ensure safety
 
- Board dimensions of 218.44 mm x 102.26 mm, height = 31.75 mm