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UWE-3.3-3-Q48PB-C Datasheet(PDF) 9 Page - Murata Manufacturing Co., Ltd. |
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UWE-3.3-3-Q48PB-C Datasheet(HTML) 9 Page - Murata Manufacturing Co., Ltd. |
9 / 13 page UWE Series Wide Input, Isolated Eighth-Brick DC/DC Converters Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. Fuses should also be used if the possibility of sustained, non-current-limited, input-voltage polarity reversals exist. For MPS UWE DC/DC Converters, you should use slow-blow type fuses, installed in the ungrounded input supply line. Refer to the specifica- tions for fuse values. All relevant national and international safety standards and regulations must be observed by the installer. For system safety agency approvals, the convert- ers must be installed in compliance with the requirements of the end-use safety standard, e.g., IEC/EN/UL60950-1. Input Undervoltage Shutdown and Start-Up Threshold Under normal start-up conditions, devices will not begin to regulate until the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once operating, devices will not turn off until the input voltage drops below the Undervoltage Shutdown limit. Subsequent re-start will not occur until the input is brought back up to the Start-Up Threshold. This built in hysteresis prevents any unstable on/off situations from occurring at a single input voltage. Start-Up Time The VIN to VOUT Start-Up Time is the interval of time between the point at which the ramping input voltage crosses the Start-Up Threshold and the fully loaded output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input/output capacitance, and load. The UWE Series implements a soft start circuit that limits the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. The On/Off Control to VOUT start-up time assumes the converter has its nominal input voltage applied but is turned off via the On/Off Control pin. The specification defines the interval between the point at which the converter is turned on and the fully loaded output voltage enters and remains within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is also governed by the internal soft start circuitry and external load capacitance. The difference in start up time from VIN to VOUT and from On/Off Control to VOUT is therefore insignificant. Input Source Impedance UWE converters must be driven from a low ac-impedance input source. The DC/DC’s performance and stability can be compromised by the use of highly inductive source impedances. For optimum performance, compo- nents should be mounted close to the DC/DC converter. If the application has a high source impedance, low VIN models can benefit from increased external input capacitance. I/O Filtering, Input Ripple Current, and Output Noise All models in the UWE Converters are tested/specified for input reflected ripple current and output noise using the specified external input/output components/ circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from backplane to the DC/DC. Input caps should be selected for bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The switching nature of DC/DC converters requires that dc voltage sources have low ac impedance as highly inductive source impedance can affect system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific system configuration may necessitate additional considerations. Input Voltage Q12 Models - Volts, max. continuous Volts, transient, 100 mSec Q48 Models - Volts, max. continuous Volts, transient, 100 mSec 0-36 VDC 0-50 VDC 0-75 VDC 0-100 VDC On/Off Control -0.7 V. min to +15V max. Input Reverse Polarity Protection See Fuse section. Output Overvoltage Vout nom. +20% max. Output Current (Note 7) Current-limited. Devices can withstand sustained short circuit without damage. Overtemperature Protection Device includes electronic over- temperature shutdown protection under normal operation. Storage Temperature -55 to +125° C. Lead Temperature See soldering specifications 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 Specifications Table is not implied or recommended. Absolute Maximum Ratings CIN VIN CBUS LBUS CIN = 33μF, ESR < 700mΩ @ 100kHz CBUS = 220μF, ESR < 100mΩ @ 100kHz LBUS = 12μH +INPUT –INPUT CURRENT PROBE TO OSCILLOSCOPE + – Figure 2. Measuring Input Ripple Current Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Be cautious when there is high atmo- spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: Maximum Preheat Temperature 115° C. Maximum Pot Temperature 270° C. Maximum Solder Dwell Time 7 seconds For Sn/Pb based solders: Maximum Preheat Temperature 105° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 6 seconds MDC_UWE Series.A17 Page 9 of 20 |
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