Non-Isolated AC/DC Linear power supply

For many applications a simple cost-effective AC/DC converter remains the most efficient option. That is where the non-isolated AC/DC linear power supply continues to play an important role. And with Nexperia's portfolio, designers can still produce an efficient converter solution while minimizing costs.

Block diagram

Highlighted components are Nexperia focus products

Design challenges

  • Max Vdrop can be controlled by adding a Zener before the ballast. As well as providing a second output (e.g. 24 V for the relay), the voltage of the relays can be adjusted to have the best price compromise
  • Using an LFPAK56 eliminates the need for a heat spreader to dissipate the power in the ballast (Vdrop x 50 mA – (24-5)*50 mA = 0.95 W)
  • Clip-bonding package provides best thermal performance (much better Rth) with no heatsink or copper surface to dissipate power

MOSFET and GaN FET Handbook

Drawing on over 20 years’ of experience, the MOSFET and GaN FET Application Handbook: A Power Design Engineer’s Guide brings together a comprehensive set of learning and reference materials relating to the use of MOSFETs and GaN FETs in real world systems.

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