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UWE-24-6-Q48NB-C Datasheet(PDF) 10 Page - Murata Manufacturing Co., Ltd. |
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UWE-24-6-Q48NB-C Datasheet(HTML) 10 Page - Murata Manufacturing Co., Ltd. |
10 / 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 In critical applications, output ripple/noise (also referred to as periodic and random deviations or PARD) may be reduced below specified limits using filter- ing techniques, the simplest of which is the installation of additional external output capacitors. These output caps function as true filter elements and should be selected for bulk capacitance, low ESR and appropriate frequency response. All external capacitors should have appropriate voltage ratings and be located as close to the converter as possible. Temperature variations for all relevant parameters should also be taken carefully into consideration. The most effective combination of external I/O capacitors will be a function of line voltage and source impedance, as well as particular load and layout conditions. In Figure 3, the two copper strips simulate real-world pcb impedances between the power supply and its load. In order to minimize measurement errors, scope measurements should be made using BNC connectors, or the probe ground should be less than ½ inch and soldered directly to the fixture. Thermal Shutdown These UWE converters are equipped with thermal-shutdown circuitry. If envi- ronmental conditions cause the internal temperature of the DC/DC converter to rise above the designed operating temperature, a precision temperature sensor will power down the unit. When the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. See Performance/ Functional Specifications. Output Overvoltage Protection UWE output voltages are monitored for an overvoltage condition via magnetic feedback. The signal is coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry will power down the PWM controller causing the output voltages to decrease. Fol- lowing a time-out period the PWM will restart, causing the output voltages to ramp to their appropriate values. If the fault condition persists, and the output voltages again climb to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. Current Limiting As soon as the output current increases to substantially above its rated value, the DC/DC converter will go into a current-limiting mode. In this condition, the output voltage will decrease proportionately with increases in output current, thereby maintaining somewhat constant power dissipation. This is commonly referred to as power limiting. Current limit inception is defined as the point at which the full-power output voltage falls below the specified tolerance. See Performance/Functional Specifications. If the load current, being drawn from the converter, is significant enough, the unit will go into a short circuit condition as specified under "Performance." 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, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart causing the output voltages to begin ramping to their appropriate values. If the short-circuit condition persists, another shutdown cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. The UWE is capable of enduring an indefinite short circuit output condition. Features and Options On/Off Control The input-side, remote On/Off Control function can be ordered to operate with either polarity: Floating Outputs Since these are isolated DC/DC converters, their outputs are "floating" with respect to their input. Designers will normally use the –Output as the ground/ return of the load circuit. You can, however, use the +Output as ground/return to effectively reverse the output polarity. Minimum Output Loading Requirements UWE converters employ a synchronous-rectifier design topology and all models regulate within spec and are stable under no-load to full load conditions. Operation under no-load conditions however might slightly increase the output ripple and noise. C1 C1 = 0.47μF CERAMIC C2 = NA LOAD 2-3 INCHES (51-76mm) FROM MODULE C2 RLOAD COPPER STRIP COPPER STRIP SCOPE +OUTPUT –OUTPUT +SENSE –SENSE Figure 3. Measuring Output Ripple/Noise (PARD) MDC_UWE Series.A17 Page 10 of 20 |
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