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Low-profile Open-frame DC-DC Converters

Wed, 07/07/2010 - 10:43am
Murata Power Solutions has introduced the UEI25-120-D48 series of 25W output, 2:1 input range, 12V output, high efficiency, isolated DC-DC converters. Featuring 25W output in one square inch of board area, the UEI25-120-D48 series offers efficient regulated DC power for PCB mounting. The low-profile 24.38 x 27.94 x 8.13 mm (0.96" x 1.1" x 0.32") converters accept a 2:1 input voltage range of 36 to 75 VDC, ideal for telecom equipment.

The series also features a 12V output which can be trimmed up or down by 10% with an external trim resistor, plus high efficiency of up to 87.5%, ensuring minimal heat buildup and allowing 'no-fan' operation.

These DC-DC converters include full magnetic isolation with Basic insulation, up to 2250 VDC. For powering digital systems, the outputs offer fast settling to step transients and will accept higher capacitive loads. Excellent ripple and noise specifications assure compatibility to noise-susceptible circuits. For systems requiring controlled startup/shutdown and external remote on/off control may use a switch, transistor or digital logic.

A wealth of self-protection features avoids both converter and external circuit fails. These include input under-voltage lockout and over-temperature shutdown. The outputs current limit using the 'hiccup' auto-restart technique and the outputs are short-circuit protected. Additional features include output over-voltage and reverse conduction elimination.

The UEI25-120-D48 series' industry-standard pinout makes this part a direct replacement for larger 1" x 2" converters. Applications include small instruments, area-limited microcontrollers, data communications equipment, remote sensor systems, telephone equipment, vehicle and portable electronics. It operates in the industrial temperature range of -40øC to +85øC.

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