Fanless rail-mount power supplies offer 91% efficiency

October 07, 2013 // By Graham Prophet
TDK-Lambda DRB series DIN rail power supplies are for low power applications fed by simple and economic DIN power solutions in industrial, building automation and process control.

The DRB series combines low cost and compact dimensions with efficiency of up to 91%. No load power consumption is between <0.3W and <0.5W depending on the model type. TDK says there is strong demand for compact, convection cooled DIN rail power supplies that deliver rated power without compromising long-term reliability; in a robust plastic case, the DRB supplies feature a narrow design, ranging from 18 mm to 45 mm, saving space on the DIN rail and believed to be the smallest products of their kind.

The supplies operate from a universal input of 85~264 Vac and have EN61000-3-2 compliance, enabling worldwide use; they can withstand voltage of 300 Vac surge for 5 seconds. The DRB series is available with four output power levels ranging from 15 – 100W and nominal output voltages of 5V, 12-15V, 24V or 48 Vdc. The supplies can operate at full load over a wide temperature range of -10 to +55°C (+70°C for 15W model). Typical ripple and noise is below 40mV; features include over current and over voltage protection, and a hold-up time of up to 20 ms at 100Vac input voltage, full load. The smallest model measures 18mm x 75mm x 90mm (DRB15-24-1); all DRB models will mount on either a TS35/7.5 or TS35/15 DIN rail and come with a range of approvals.