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BEI15-150-Q48N-C Datasheet(PDF) 7 Page - Murata Manufacturing Co., Ltd. |
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BEI15-150-Q48N-C Datasheet(HTML) 7 Page - Murata Manufacturing Co., Ltd. |
7 / 13 page BEI15 Series Isolated Wide Input Bipolar 15-Watt DC/DC Converters www.murata-ps.com email: sales@murata-ps.com 04 Mar 2010 MDC_BEI15W.A01 Page 7 of 13 perature, an on-board electronic temperature sensor will power down the unit. When the temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of temperature hysteresis to prevent rapid on/off cycling. CAUTION: If you operate too close to the thermal limits, the converter may shut down suddenly without warning. Be sure to thoroughly test your applica- tion to avoid unplanned thermal shutdown. Temperature Derating Curves The graphs in the next section illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airflow measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in current or reduced airflow as long as the average is not exceeded. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that very low flow rates (below about 25 LFM) are similar to “natural convection”, that is, not using fan-forced airflow. Murata Power Solutions makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. CAUTION: If you exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected near Sea Level altitude. Be sure to reduce the derating for higher altitude. Output Current Limiting Current limiting inception is defined as the point at which full power falls below the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly rise above its rated value in normal operation as long as the average output power is not exceeded. This enhances reliability and continued operation of your application. If the output current is too high, the converter will enter the short circuit condition. Output Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the output current demand increases. If the output voltage drops too low (approxi- mately 98% of nominal output voltage for most models), the PWM controller will shut down. Following a time-out period, the PWM will restart, causing the output voltage to begin rising to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initiate. This rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the average output cur- rent, thereby preventing excessive internal temperatures and/or component damage. Remote On/Off Control The remote On/Off Control can be specified with either logic polarity. Please refer to the Connection Diagram on page 1 for On/Off connections. Positive polarity models are enabled when the On/Off pin is left open or is pulled high to +Vin with respect to –Vin. Therefore, the On/Off control can be disconnected if the converter should always be on. Positive-polarity devices are disabled when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –Vin. Negative polarity devices are on (enabled) when the On/Off pin is left open or brought to within a low voltage (see Specifications) with respect to –Vin. The device is off (disabled) when the On/Off is pulled high (see Specifications) with respect to –Vin. Dynamic control of the On/Off function must sink the specified signal current when brought low and withstand the specified voltage when brought high. Be aware too that there is a finite time in milliseconds (see Specifications) between the time of On/Off Control activation and stable, regulated output. This time will vary slightly with output load type and current and input conditions. Output Capacitive Load These converters do not require external capacitance added to achieve rated specifications. Users should only consider adding capacitance to reduce switching noise and/or to handle spike current load steps. Install only enough capacitance to achieve your noise and surge response objectives. Excess external capacitance may cause regulation problems and possible oscillation or instability. The maximum rated output capacitance and ESR specification is given for a capacitor installed immediately adjacent to the converter. C1 C1 = 0.1μF CERAMIC C2 = 10μF TANTALUM LOAD 2-3 INCHES (51-76mm) FROM MODULE C2 RLOAD COPPER STRIP COPPER STRIP SCOPE +OUTPUT +SENSE -OUTPUT Figure 3: Measuring Output Ripple and Noise (PARD) |
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