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UEI15 Datasheet(PDF) 4 Page - Murata Manufacturing Co., Ltd. |
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UEI15 Datasheet(HTML) 4 Page - Murata Manufacturing Co., Ltd. |
4 / 16 page UEI15 Series Isolated Wide Input Range 15-Watt DC/DC Converters www.murata-ps.com email: sales@murata-ps.com 14 Mar 2011 MDC_UEI15W.B42 Page 4 of 16 Absolute Maximum Ratings Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifi- cations is neither implied nor recommended. (4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR- 332 Method 1, Case 3, ground fixed conditions, Tpcboard=+25 deg.C, full load, natural air convection. (5) The On/Off Control is normally controlled by a switch. But it may also be driven with external logic or by applying appropriate external voltages which are referenced to Input Common. The On/Off Control Input should use either an open collector or open drain transistor. (6) Output current limiting begins when the output voltage degrades approximately 2% from the selected setting. (7) The outputs are not intended to sink appreciable reverse current. This may damage the outputs. (8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction. (9) All models are fully operational and meet published specifications, including “cold start” at –40°C. (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) The output overvoltage protection is automatic recovery after fault removal. The overvoltage may occur either from internal failure or from an external forcing voltage as in a shared power system. (12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) At zero output current, the output may contain low frequency com- ponents which exceed the ripple specification. The output may be operated indefinitely with no load. (15) If reverse polarity is accidentally applied to the input, to ensure reverse input protection with full output load, always connect an external input fuse in series with the +VIN input. Use approximately twice the full input current rating with nominal input voltage. (16) “Hiccup” operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the con- verter immediately recovers normal operation. (17) On model UEI15-050-Q48, if VIN <20V, output trim may only be adjusted downwards from +5.0V (more negative). (18) Shown at Vin = 10V. CAUTION: This product is not internally fused. To comply with safety agency certifications and to avoid injury to personnel or equipment, the user must connect an external fast-blow fuse to the input terminals. See fuse information. (19) All models require 10% of Imax minimum output load to meet specifi- cations. However, they will not be damaged at zero output load. SPECIFICATION NOTES (1) All models are tested and specified with external capacitors listed in the table below. The external capacitors listed below are ONLY for establishing test specifications. They are required for our test fixtures and equipment. Your applica- tion may not need them. The converter is stable with no external capacitors but Murata Power Solutions strongly recommends external caps. All caps are low-ESR types. Where two or more capacitors are listed, these are connected in parallel. All caps should mount close to the DC/DC using short leads. All specifications are typical unless noted. General conditions for Specifica- tions are +25 deg.C, VIN=nominal, VOUT=nominal, full load. Adequate airflow must be supplied for extended testing under power. (2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz band- width. Input filtering is CIN=33 μF, 100V tantalum, CBUS=220 μF, 100V electro- lytic, LBUS=12 μH. (3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing density altitude. ABSOLUTE MAXIMUM RATINGS Input Voltage Q12 models Volts Max. continuous 36 VDC Volts, transient 100mS 50 VDC Q48 models Volts Max. continuous 75 VDC Volts, transient 100mS 100 VDC On/Off control, referred to –VIN Volts, Min. –0.3 Volts, Max. 15 Input Reverse Polarity Protection See fuse section Output Overvoltage, Volts Max. VOUT nom. +20% Output Current, sustained short circuit Current-limited, see specs Storage Temperature Range, Min. ºC -55 Max. ºC +125 INPUT/OUTPUT EXTERNAL TEST CAPACITORS Model Input Capacitor Output Capacitor(s) UEI15-033-Q12 100 μF 1 μF & 10 μF UEI15-033-Q48 4.7 μF ceramic 1 μF & 10 μF UEI15-050-Q12 100 μF 1 μF & 10 μF UEI15-050-Q48 4.7 μF ceramic 1 μF & 10 μF UEI15-120-Q12 100 μF 1 μF & 10 μF UEI15-120-Q48 4.7 μF ceramic 1 μF & 10 μF UEI15-150-Q12 100 μF 1 μF & 10 μF UEI15-150-Q48 4.7 μF ceramic 1 μF & 10 μF |
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