DC switching regulators

Jon Lawson

CUI’s Power Group has added four new series to its family of non-isolated DC switching regulators.

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 0.2 mA.

Packaged in an ultra-compact, 3 pin SIP footprint, the encapsulated models measure just 0.45 x 0.29 x 0.40-in (11.60 x 7.55 x 10.16mm), while the open frame models have even smaller dimensions of 0.39 x 0.28 x 0.43-in (10.00 x 7.20 x 11.00mm).

The 500mA series accept a wide range of input voltages up to 4.75 to 36 Vdc, while the 1A series accommodate input voltage ranges up to 6 to 36 Vdc. 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.