The HFE1600 Series, comprising 1U high, single-output AC-DC hot-swap front-end power supplies has been introduced by TDK-Lambda, offering ‘industry leading’ power density for a 1.6kW front-end of 25.2W/in3, says the company.

Intended for equipment requiring reliable 12V, 24V and 48V bulk power, typical applications include communications, broadcast, military (COTS), laser and process control. Up to 20% output voltage adjustment is possible, enabling the HFE1600 to be user set according to specific needs. Operating from a universal 85 to 265VAC input, the high EFFICIENCY of up to 92% minimises heat dissipation and power consumption thus meeting Climate Savers Computing efficiency standards.

With dimensions of 300mm x 85mm x 41mm, the HFE1600 power supplies can be used individually or up to five units can be mounted into a dedicated 1U available from TDK-Lambda rack delivering 8kW. A total of ten units can be configured in parallel to form a hot-swap N+1 redundant power system with single wire current sharing. Alternatively different voltage models can be mixed and matched to customer requirements. A keying system prevents mis-insertion of different voltage units. Each power supply has variable-speed cooling fans and can operate in temperatures ranging from -10C to +70C.

Output voltage is programmable by resistance, external voltage or optional PM Bus compatible I2C communication interface. Output current is external voltage or PM bus programmable.

Over-voltage, over-current and over-temperature are standard protection features and front-panel mounted DC OK and LEDs are provided for visual monitoring. For system monitoring there are opto-isolated signals for DC OK, AC-fail, over temperature and ‘power supply present’. Remote ON/OFF control and remote sense are included. Monitoring is also available via the optional I2C interface and includes a fan fail alarm.

The HFE1600 supplies comply with EN55022 and FCC Class A radiated and Class B conducted emissions and meet IEC61000-4 immunity. The units are safety approved to EN/IEC/UL 60950-1 edition 2 with CE mark, says the company.

This article was taken from: electropages.com

The LTM4627, a new 15A DC-DC uModule regulator has been introduced by Linear Technology. It has onboard inductors, MOSFETs and supporting components in a 2.6g, 15mm x 15mm LGA (land grid array) package.

Circuit design enhancements lower gate capacitance MOSFETs and stronger MOSFET drivers enable the LTM4627 to operate at approximately 7% higher EFFICIENCY or to deliver up to 15A load current in the same board area and junction temperature as the 10A DC-DC uModule regulator. (Comparison conditions: 12Vin, 1.2Vout, 10A compared to the LTM4600 10A uModule regulator. The LTM4600 is offered in 15mm x 15mm x 2.82mm and LTM4627 in 15mm x 15mm x 4.32mm LGA).

The LTM4627 can convert input supplies ranging from 4.5V to 20V to output voltages from 0.6V to 5V, regulating the output with only +/-1.5% total DC output error maximum. Multiple LTM4627 devices can be paralleled for current sharing up to 60A. Applications include telecom servers, networking and industrial equipment, medical imaging systems as well as avionics equipment.

The LTM4627 has an onboard differential remote sense amplifier to precisely regulate very low voltage, high current loads such as 1V or sub-1V core voltages of FPGAs and ASICs. Remote sensing corrects voltage errors caused by the impedance of PCB traces when large current flows to the load. Output voltage tracking and soft-start features allow controlled power up and power down of a complex board with multiple power rails. The device’s PLL (phase-locked loop) function permits users to synchronize the LTM4627 to a clock frequency from 250kHz to 780kHz, avoiding a specific frequency or frequency range that may interfere with sensitive components.

The LTM4627 is ‘guaranteed’ for operation from -40C to 125C, says the company.

This article was taken from: electropages.com

XP Power announced what is believed to be the world’s smallest open frame 45 W AC-DC power supply. Setting a new benchmark at this power level, measuring just 2 x 3 x 1.05 inches (50.7 x 76.2 x 26.7 mm), the ECS45 single output power supply is 25% smaller than the current industry standard of 2 x 4 inches. All models have a no load power of less than 0.3 W, helping the end equipment comply with internationally recognized energy efficiency standards. In addition, these convection cooled units are highly efficient, typically 87%, resulting in less waste heat to dissipate. The lower profile ECS25 model provides 25 W output within the same footprint. They can provide full power output up to + 50 degrees C without the need for any external fans or forced airflow and operate up to + 70 degrees C with derating.

Both models provide the nominal outputs of +12, +15, + 24 or +48 VDC. The ECS45 is also available with a single +5 VDC 6 A output. They have a wide input voltage range of 80-264 VAC and are approved for Class I and Class II applications. The units meet UL60601-1 / EN60601-1 medical equipment safety standards and UL60950-1 / EN60950-1 standards for IT and industrial equipment. They also comply with the EN55011 / EN55022 level B standard for conducted emissions without the need for additional filtering components. Overvoltage, overload and short-circuit protection features are included as standard across the whole range.

The power supplies suit designers of medical, IT or industrial equipment.
Applications can cover a wide variety, such as broadcast equipment, computing and data storage. The medical safety approval makes it suitable for products such as portable medical devices, home healthcare devices and personal drug delivery equipment.

Covered versions of each model are also available for Class I installations. Both series have a 3 year warranty and are available from Newark or direct from XP Power

This article was taken from: gotopower.net

The power-factor-corrected HTK series single-output, low-voltage switch-mode power supplies offer a wide choice of case types, output connectivity, front panels, and 11 different output voltages between 3.3V and 54V. The units offer a maximum output power of 198W for 3.3V model and 300W for all others. The HTK400 supplies have a maximum output power of 400W, except for the 3.3V unit, which has a maximum output power of 264W. The supplies accept an input between 90 and 264 Vac and exhibit a typical active power factor correction to 0.99. The entire series is available in enclosed, U-channel, and open-frame variations and without a front panel or with one of four options: IEC inlet only, terminal block only, power switch and IEC inlet, or power switch and terminal block. The output connector can be a barrier type terminal block, euro type terminal block or a Molex type connector. HITEK POWER CORP., Santee, CA. (619) 258-7700.

This article was taken from: Electronic Design

The LTC3829, a new three-phase single-output high-EFFICIENCY (up to 95%) synchronous step-down DC-DC controller, has been introduced by Linear Technology. It features PolyPhase operation, differential output voltage sensing and integrated phased-lock loop (PLL) clock synchronization.

Up to six phases can be paralleled and clocked out of phase to minimize input and output filtering requirements for high-current applications (up to 150A). The differential amplifier provides true remote output voltage sensing of both the positive and negative terminals, enabling high accuracy regulation independent of IR losses in trace runs, vias and interconnects. Applications include high current ASIC and FPGA supplies, power distribution buses, high power audio amplifiers and network servers.

The LTC3829 operates with all N-channel MOSFETs from input voltages ranging from 4.5V to 38V, and it can produce ±0.75% accurate output voltages from 0.6V to 5V. The output current is sensed by monitoring the voltage drop across the output inductor (DCR) or by using a sense resistor. Programmable DCR temperature compensation maintains an accurate and constant current limit set point over a broad temperature range. The powerful onboard gate drivers minimize MOSFET SWITCHing losses and allows the use of multiple MOSFETs connected in parallel. A fixed operating frequency can be programmed from 250kHz to 770kHz or can be synchronized to an external clock with its internal PLL. The device’s minimum on time of just 90ns makes the LTC3829 ideal for high step-down ratio applications.

The LTC3829 incorporates an adjustable Stage Shedding™ technique to increase light load efficiency by eliminating the gate charge and switching losses of two of its output stages. In addition, the LTC3829 can be configured for adjustable Burst Mode® operation, producing even higher efficiency at light loads. An optional non-linear control mode improves load step transient response and adaptive voltage positioning (AVP) minimizes the maximum transient voltage deviation during a step-load.

Tracking and sequencing functions allow the optimization of power-up and power-down of multiple power supplies. Additional features include current mode control, an onboard LDO for IC power, programmable soft start, a power good output and external VCC.

The LTC3829 is available in thermally enhanced 38-lead TSSOP or 38-lead 5mm x 7mm QFN packages and operates over a -40C to 125C operating junction temperature range, says the company.

This article was taken from: electropages.com

Significant additions to its industry leading Powertron family of DC-DC CONVERTERs have been announced. The new DC-DC converters are extensions to the established JL Series of open-frame units originally designed for on-board passenger information systems.

The new JLM and JLHM converters are rated at 35W and 50W respectively and offer all of the features and benefits of the standard range, including full EN50155 compliance, but in a much smaller footprint. Both JLM and JLHM units can accept the wide range of typical railway input voltages and outputs can be specified between 5VDC and 110VDC.

The open-frame version of both products measures just 115mm x 85mm x 22mm, which is less than half the overall size of the original range. This makes the power supply ideal for users wishing to install a converter in their own equipment where space is limited. For chassis mount applications, an enclosed version is also available, says the company.

This article was taken from: electropages.com