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| 型号： | UEI25-050-D48N-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 20/24页 |
| 文件大小： | 0K |
| 描述： | CONV DC/DC 25W 5V |
| 产品培训模块： | UEI25 Series |
| 产品目录绘图： | UEI25 Series |
| 标准包装： | 90 |
| 系列： | UEI25 |
| 类型： | 隔离 |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 36V |
| 电压 - 输入（最大）： | 75V |
| Voltage - Output 1： | 5V |
| 电流 - 输出（最大）： | 5A |
| 电源（瓦） - 制造商系列： | 25W |
| 电压 - 隔离： | 2.25kV（2250V） |
| 特点： | 具有远程开/关功能 |
| 安装类型： | 通孔 |
| 封装/外壳： | 6-DIP 模块 |
| 尺寸/尺寸： | 1.10" L x 0.96" W x 0.32" H（27.9mm x 24.4mm x 8.1mm） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 89% |
| 电源（瓦特）- 最大： | 25W |
| 产品目录页面： | 2719 (CN2011-ZH PDF) |
| 其它名称： | 811-2223 |
UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
CAUTION: If you exceed these Derating guidelines, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
+VOUT
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Output Overvoltage Protection (OVP)
C1
C2
SCOPE
R LOAD
This converter monitors its output voltage for an over-voltage condition using
an on-board electronic comparator. The signal is optically coupled to the pri-
?VOUT
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
Minimum Output Loading Requirements
These converters employ a synchronous recti?er design topology. All models
regulate within speci?cation and are stable from 0% load to full load conditions,
unless otherwise speci?ed. Operation under no load will not damage the con-
verter but might, however, slightly increase regulation, output ripple, and noise.
Thermal Shutdown
To protect against thermal over-stress, these converters include thermal shut-
down circuitry. If environmental conditions cause the temperature of the DC/
DC’s to rise above the Operating Temperature Range up to the shutdown tem-
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 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 application to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in the performance data 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 air?ow measured in Linear Feet per Minute (“LFM”). Note that
these are AVERAGE measurements. The converter will accept brief increases in tem-
perature and/or current or reduced air?ow as long as the average is not exceeded.
Note that the temperatures are of the ambient air?ow, not the converter it-
self which is obviously running at higher temperature than the outside air. Also
note that “natural convection” is de?ned as very low ?ow rates which are not
using fan-forced air?ow. Depending on the application, “natural convection” is
usually about 30-65 LFM but is not equal to still air (0 LFM).
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated air?ow. We use both thermocouples and an
infrared camera system to observe thermal performance. As a practical matter,
it is quite dif?cult to insert an anemometer to precisely measure air?ow in
most applications. Sometimes it is possible to estimate the effective air?ow if
you thoroughly understand the enclosure geometry, entry/exit ori?ce areas and
the fan ?owrate speci?cations.
mary side PWM controller. If the output exceeds OVP limits, the sensing circuit
will power down the unit, and the output voltage will decrease. After a time-out
period, the PWM will automatically attempt to restart, causing the output volt-
age to ramp up to its rated value. It is not necessary to power down and reset
the converter for this automatic OVP-recovery restart.
If the fault condition persists and the output voltage climbs to excessive
levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling
is referred to as “hiccup” mode.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However, your application circuit may need additional protection. In the
extremely unlikely event of output circuit failure, excessive voltage could be applied
to your circuit. Consider using an appropriate external protection.
Output Current Limiting
As soon as the output current increases to approximately its overcurrent limit,
the DC/DC converter will enter a current-limiting mode. The output voltage will
decrease proportionally with increases in output current, thereby maintaining a
somewhat constant power output. This is commonly referred to as power limiting.
Current limiting inception is de?ned as the point at which full power falls
below the rated tolerance. See the Performance/Functional Speci?cations.
Note particularly that the output current may brie?y rise above its rated value.
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, the
magnetically coupled voltage used to develop PWM bias voltage will also drop,
thereby shutting down the PWM controller. 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 initi-
ate. This on/off cycling is called “hiccup mode.” The hiccup cycling reduces the
average output current, thereby preventing excessive internal temperatures.
Trimming the Output Voltage
The Trim input to the converter allows the user to adjust the output voltage over
the rated trim range (please refer to the Speci?cations). In the trim equations
and circuit diagrams that follow, trim adjustments use a single ?xed resistor
connected between the Trim input and either Vout pin. Trimming resistors should
have a low temperature coef?cient (±100 ppm/°C or less) and be mounted close
to the converter. Keep leads short. If the trim function is not used, leave the trim
unconnected. With no trim, the converter will exhibit its speci?ed output voltage
accuracy.
www.murata-ps.com/support
MDC_UEI25W.B09 Page 20 of 24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UEI25-050-D48NM-C | 功能描述:DC/DC转换器 48Vin 5Vout 5A SMT 25W Neg. Polarity RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| UEI25-050-D48P-C | 功能描述:DC/DC转换器 48Vin 5Vout 5A 25W Pos. Polarity RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| UEI25-050-D48PM-C | 功能描述:DC/DC转换器 48Vin 5Vout 5A SMT 25W Pos. Polarity RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| UEI25-120 | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Single Output Isolated 25-Watt DC/DC Converters |
| UEI25-120-D48 | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Single Output Isolated 25-Watt DC/DC Converters |
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