RoHS -compliant 150W AC-DC Power Supplies - ideal front-ends for distributed power

High density 5 x 3 x 1.25-inch package suits 1U-high rack equipment;Low airflow requirements: convection-only to 100W, then just 200 LFM to 150W

UR (www.urgroup.co.uk) has introduced a new series of compact, RoHS-compliant 150W AC-DC power supplies from its partner Artesyn Technologies that are ideal front-end conversion solutions for systems with distributed power and point-of-load (POL) architectures. The new TLP150 series provides a choice of 12V, 24V or 48V outputs to simplify system integration, backed by extensive control and monitoring features to satisfy a wide variety of DC supply requirements.

For distributed power applications, the 12V model can be used to directly power boards fitted with multiple non-isolated point-of-load DC-DC converters, while the 24V and 48V models are suitable for feeding on-board isolated brick or intermediate bus converters. The 24V model is also ideal for powering equipment with electromechanical loads such as relays, pumps and print-heads. In addition to the main output channel, each power supply also provides a 12V output for powering fans. For applications that require standby operation, an auxiliary 'always-on' 5V DC output is available as an option.

All TLP150 series power supplies are RoHS-compliant. The 12V and 24V models are also available with full medical approvals, for applications such as patient monitoring systems and other portable equipment used in medical wards and surgical operating theatres. The medically approved versions have a very low safety ground leakage figure of 150 ?A, compared to 1 mA for the industrial versions, and are equipped with fuses in both live and neutral inputs.

TLP150 series AC-DC power supplies employ an open-frame construction, combined with highly integrated layout and packaging techniques, to realise a small form factor, high functionality unit capable of delivering high levels of useable power. Measuring just 5 x 3 inches, with a profile of only 1.25 inches, the supplies have a power density of 8W per cubic inch. The main output channel can deliver up to 100W continuously under free air convection conditions, rising to 150W with just 200 LFM forced-air cooling. The power supplies accommodate a wide ambient operating temperature range of 0°C to 70°C, maintaining full rated output up to 50°C.

All TLP150 series power supplies feature a universal input that accepts any voltage in the range 85 to 264V AC at any frequency from 47 to 63Hz, enabling them to be used in equipment destined for any part of the world. Active power factor correction minimises input harmonic current distortion and ensures compliance with the international EN61000-3-2 standard. The power supplies employ the latest high frequency switch-mode technology to maximise conversion efficiency, typically achieving 81% at full load with a 115V AC input, and 84% with a 230V AC input. Primarily intended as low- to medium-power front-end units for distributed power systems, the small physical size and high functionality of the TLP150 series makes the units especially suitable for use in information technology equipment, light industrial systems and medical equipment.

Built-in control and monitoring features include 'AC power good and 'DC power good' output signals and a remote on/off input, along with comprehensive protection against overcurrent, overvoltage and overtemperature conditions. TLP150 series 12V, 24V and 48V power supplies provide maximum main channel output currents of 12.5A, 6.3A and 3.2A respectively.

Active 'democratic' current sharing, enabling multiple units to be connected in parallel for higher current applications, is available on select models. These models also incorporate internal ORing diodes fitted to the main output, for fault-tolerant and N+1 redundancy applications.

The main output channel voltage of each supply can be adjusted 10% either side of nominal via an internal trim potentiometer, and regulation is maintained to within ±3% for all line and load conditions. Differential remote sense facilities are provided to compensate for up to 0.2V drop between the main channel output terminals and the load. The auxiliary 5V DC output is regulated to within ±5% and can deliver up to 1.0A; it is primarily intended for powering 'standby' circuitry that needs to remain on for most of the time, such as power-up/down sequencers, and is unaffected by the on/off status of the main output channel. The auxiliary 12V fan output can deliver up to 0.5A and is present whenever the main output channel is on.

All TLP150 series AC-DC power supplies comply with the rigorous EN55022-B and FCC part 15 Level B EMC standards for conducted noise and meet all applicable immunity standards, including EN61000-4-2, -3, -4, -5 and -6, levels 3. The power supplies carry UL/cUL60950-1 and EN60950-1 VDE safety approvals, and the medical versions are also approved to UL/cUL2601-1 and VDE EN60601-1. The standard industrial versions of the supplies have isolation ratings of 3000V AC input/output and 1500V AC input/chassis, while the medical versions have higher 4000V AC input/output ratings.