The addition of four new series to the family of non-isolated DC switching regulators has been announced by CUI’s Power Group. The next generation VX78‑500, VXO78‑500, VX78‑1000, and VXO78‑1000 series are extremely efficient, typically up to 96%, and balance maximising economy while delivering a high level of performance as a direct alternative to using linear regulators.
Utilising switching technology, the models are footprint compatible with TO-220 package LM78XX and LM79XX model regulators and unlike linear regulators, do not require a heat sink. This makes them suitable for use in portable devices, battery-fed equipment, and embedded designs where board space is at a premium and energy efficiency is a concern.
The encapsulated VX78 series and open frame VXO78 series, suited for positive or negative output applications, both offer 500mA and 1A output current options and have no-load input currents as low as 0.2mA. Packaged in an ultra-compact, 3 pin SIP footprint, the encapsulated models measure just 0.45x0.29x0.40” (11.60x7.55x10.16mm), while the open frame models have even smaller dimensions of 0.39x0.28x0.43” (10.00x7.20x11.00mm).
The 500mA series accept a wide range of input voltages up to 4.75-36VDC, while the 1A series accommodate input voltage ranges up to 6-36VDC. Nominal output voltages of 3.3, 5, 9, 12, or 15VDC, are also available depending upon the series. Operating temperatures for all models range from ‑40 up to 71°C at full load, derating to 60% load at 85°C.
These non-isolated DC/DC converters also feature low ripple and noise, continuous short circuit protection, and UL 60950‑1 and CSA safety certifications, along with the CE mark. All models carry a minimum MTBF of 2,000,000 hours at 25°C ambient, calculated per MIL‑HDBK‑217F.