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R3 Series DC/DC Converters from Mornsun lead the field

Available from leading UK Power Conversion distributor PowerPax the Mornsun R3 range of DC/DC Converters lead the field in terms of performance. This series features a completely new design structure to provide solutions to a number of common application issues and features over 100 models from 3 – 30W.

New series solves a number of common application problems

These converters are available in single and dual O/P with industry standard footprints and inputs of 9 - 36V DC & 18 - 75V DC (4:1). All models feature input under voltage protection with input to output isolation of up to 6000VDC.

Industrial equipment generally operates at light loads with periods of high load requirement and as such the low load condition is outside of the standard operating parameters of many DC converters. In such cases a dummy load is often used but the result of this is an increase in temperature and unnecessary power usage. The R3 series significantly improves operations under such conditions through the use of variable frequency switching techniques to remove the requirement for a dummy load. These converters are stable between loads of 0 – 100% and as a result the output voltage remains within specification irrespective of the load condition.

The efficiency of this range exceeds 78% in the load range 5 – 30% and the no load power consumption is as low as 0.12W thereby reducing power consumption and preventing unwanted temperature rise.

These regulated converters have excellent stability characteristics with Load regulation of ±0.5% and Line regulation of ±0.2%. In addition outputs have low ripple and noise characteristics.

In many systems there are issues with the DC converter start-up time (typically >200mS) and in such cases measures must be taken to ensure that the DC converter output is stablebefore system start-up is allowed . This issue can be compounded by overshoot on the output as the DC converter starts and again measures are often taken to protect circuits from this, normally with additional components and associated cost. The R3 converters solves both issues by providing a start-up time of typically 20mS whilst controlling the output rise to preventovershoot, thereby allowing quicker system start without the dangers associated with overshoot.

In situations where an abnormal shutdown of equipment occurs, commonly found in industrial systems, problems may occur. To overcome this condition the R3 series converters have a number of in-built protection features including input under-voltage, output over-voltage, over-current and self-recovering short circuit protection which enhance safety and system reliability.

Compliance with EMC requirements is a must in today’s electronic systems and many DC converters will require external components to meet required levels. This is not as issue for the R3 series converters which meet CISPR22/EN55022 Class A without the need for external components.

Environmentally this series of DC converters performs well with an operating temperature range of -40 to +85°C and a storage temperature range of -55 to +125°C.

All of the products in this series are CE/UL Certified to assist in making the route through product approval easier.

Power conversion components are the heart of any system and the reliability of such components is paramount to overall system reliability, especially in the harsh conditions that industrial systems need to operate in. All converters in this series have undergone full reliability testing throughout all phases from design to production and meet an MTBF 1000K hr’s (MIL-HDBK-217F@25°C). Reliability testing includes high temperature operation testing, low temperature operation testing, temperature cycle testing, thermal shock testing, and vibration testing. The reliability of these devices is enhanced by the fully automated manufacturing process which ensures high precision and repeatability.

This series of converters provides a step up in performance whilst remaining cost competitive with excellent lead times. Free samples are available from PowerPax by visiting

These converters are suitable for a wide range of applications including - Industrial Instrumentation and Control, Electricity monitoring, Telemetry, Data transmission, telecommunications and Robotics to name a few.


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