Non-isolated DC-DC converters offer and wide range of inputs and outputs

TDK Corporation has introduced the 250W rated TDK-Lambda RGA series of ruggedised non-isolated DC-DC converters. Able to operate from an input voltage of 9V to 40V or 9V to 53V, the non-isolated step-down converters provide output voltages that can be adjustable from 3.3V to 15V, 3.3V to 24V or 3.3V to 40V with output currents of up to 20A. The series is intended to be employed in harsh environment applications, including robotics, AGVs, COTS, communications, industrial and portable battery-powered equipment.

In a 1/16th brick form factor, measuring 35.6mm x 25.6mm x 13mm, the converters are encapsulated to supply a higher resistance to shock and vibration. The five-sided aluminium die-cast housing with mounting tabs decreases radiated EMI and allows conduction cooling to a cold-plate for fan-less operation.

The RGA models comprise three voltage and current combinations to support operation from 12V, 18V, 24V, 36V and 48V power sources. The wide input ranges can help with inventory reduction programs, with one part number covering multiple nominal voltages.

With up to 98% efficiencies, power losses are minimised, allowing the products to operate in harsh environments of -40C to +110C case temperature. The necessity for external output capacitance is decreased due to an optimised dynamic voltage response, reducing board space needs.

The basic feature models incorporate an output voltage adjustment pin, negative logic remote on-off, remote sense, input under-voltage, over-current and thermal protection. Full feature models are provided with a power good signal, output voltage sequencing and the ability to synchronise the operating frequency to minimise system noise.

All models carry the CE and UKCA mark for the Low Voltage and RoHS Directives and are designed to the IEC/UL/CSA/EN 62368-1 safety standards. Evaluation boards are provided for quick and easy testing.