Wide input DC/DC converters

November 2nd, 2008 • Related • Filed Under

Murata Power Solutions has expanded its offering of isolated, wide input range DC/DC Converters with the introduction of its UEI15 DC/DC converter series. The UEI15 DC/DC converter is rated at 15W and comprises eight models that give designers a choice of regulated fixed output voltages from 3.3V to15V. Featuring a full 15 Watt or greater output in one square inch of board area, the UEI series isolated DC/DC converter family offers efficient regulated DC power for printed circuit board mounting. Applications include small instruments, area-limited microcontrollers, computer-based systems, data communications equipment, remote sensor systems, vehicle and portable electronics.

With excellent power density of 15W in just one square inch of board area, the PCB mounting the DC/DC converter is ideal for high current designs where space is constrained. Typical applications include industrial products, from small instruments, microcontrollers and remote sensor systems, as well as vehicle electronics, transportation and portable equipment. The new modules use a synchronous rectifier forward topology to help them achieve efficiency levels of up to 89%. Stable no-load operation is possible with no external components and the converters have an industrial operating temperature range of -40ºC to +85ºC (with derating).

An industry standard 0.96in. x 1.10in. x 0.36in. (24.4mm x 27.9mm x 9.1mm) package and pinout coupled with a wide input voltage range of either 9-36VDC or 18-75VDC simplifies the integration of the UEI15 series into a wide array of applications. Wide range 4:1 inputs on the 0.9″ x 1.1″ x 0.335″ converter are either 9 to 36 Volts DC (Q12 models) or 18 to 75 Volts DC (Q48 models), ideal for battery-powered and telecom equipment. The industry-standard pinout fits larger 1″ x 2″ converters. Fixed output voltages from 3.3 VDC to 15 VDC are regulated to within ±0.2% or less and may be trimmed within ±10% of nominal output.

The UEI15 DC/DC converter series has full magnetic and optical isolation of 2000VDC (9-36Vin) and 2250VDC (18-75Vin) that includes basic insulation. Fast settling to current step loads and tolerance of higher capacitive loads makes the UEI15 series suitable for connection to digital systems, whilst excellent ripple and noise specifications ensure compatibility with circuits using CPUs, ASICs, FPGAs and programmable logic. For applications requiring controlled start-up and shutdown, remote on/off control may be used by means of an external switch, transistor or digital logic. The UEI 15W series includes full magnetic and optical isolation up to 2250 Volts DC (basic insulation). For connection to digital systems, the outputs offer fast settling to current step loads and tolerance of higher capacitive loads. Excellent ripple and noise specifications assure compatibility to circuits using CPU’s, ASIC’s, programmable logic and FPGA’s. For systems requiring controlled startup/shutdown, an external switch, transistor or digital logic may be used to activate the remote On/Off control.

A wealth of self-protection features avoid both converter and external circuit problems. These include input undervoltage lockout and overtemperature shutdown. The outputs current limit using the “hiccup” autorestart technique and the outputs may be short-circuited indefinitely. Additional features include output overvoltage and reverse conduction elimination. The high efficiency offers minimal heat buildup and “no fan” operation.

Design features of the UEI15 include input undervoltage lockout and over-temperature shutdown plus output overvoltage and reverse conduction elimination. Output current limiting uses the ‘hiccup’ auto-restart technique and the converters sustain short-circuits indefinitely. The lead-free assembly helps ensure full compliance with RoHS standards, and all modules in the series meet UL 60950-1, CAN/CSA-C22.2 No. 60950-1, IEC60950-1 and EN60950-1 safety approvals.

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