All four converters feature a wide input voltage range of 36 to 75 Vdc, making them ideal for use with telecom-standard 48 V supplies, and are fully protected against input voltage transients of up to 100 V for 100 ms. The converters’ outputs can be adjusted from 90% to 110% of nominal, using an external trim resistor. Design-in flexibility is further enhanced by the fact that the converters have no minimum load requirement, and provide a true monotonic start-up characteristic under both normal and pre-biased load conditions. The converters have a typical start-up time of 20 ms when driving a resistive load, and feature differential remote sense and remote on/off facilities as standard.
In common with all Artesyn LES series eighth-brick dc-dc converters, the latest models have an industry-standard 58.4 x 22.9 mm footprint, which is 38% less than conventional quarter bricks, and are based on an open-frame, single-board package. The new models are available in both through-hole and surface-mounting configurations, and use surface-mount components and planar, in-the-board transformer structures to help minimise profile, allowing the installed height to be kept to just 8.1 mm. This exceptionally low profile means that the converters are suitable for applications involving very tight inter-board spacing, such as latest-generation telecom switches and high-end servers. The converters’ pin-out is identical to standard quarter-brick converters, facilitating drop-in replacement.
The converters are specified for operation over an ambient temperature range of -40 to +85 degrees Celsius. Standard features include under-voltage lockout and non-latching over-voltage protection, as well as protection against short-circuit and over-temperature conditions, with automatic recovery. The converters carry a full set of international safety approvals, including EN60950 TUV and UL/cUL60950.
Artesyn LES series eighth-brick converters are available for immediate delivery, and the standard lead-time for quantity orders is stock to 8 weeks. Pricing in 1,000-piece quantities is $28 US.