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| 型号： | HPQ-12/25-D48NBL1-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | CONV DC/DC 300W 12V 25A |
| 标准包装： | 60 |
| 系列： | * |
| 其它名称： | HPQ-12/25-D48NBL1C HPQ-12/25-D48NBL1C-ND Q7059696A |
HPQ-12/25-D48 Series
Isolated 300-Watt Quarter Brick DC-DC Converters
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-
+OUTPUT
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.
C1
C2
SCOPE
R LOAD
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
?OUTPUT
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
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 this data sheet illustrate typical operation under a variety of condi-
tions. 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 temperature
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 itself
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 usu-
ally 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.
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 Overvoltage Protection (OVP)
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.
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 (See Speci?cation Note 7)
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/deg.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.
There are two CAUTIONs to observe for the Trim input:
CAUTION : To avoid unplanned power down cycles, do not exceed EITHER the
maximum output voltage OR the maximum output power when setting the
trim. If the output voltage is excessive, the OVP circuit may inadvertantly shut
down the converter. If the maximum power is exceeded, the converter may
enter current limiting. If the power is exceeded for an extended period, the
converter may overheat and encounter overtemperature shut down.
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-
www.murata-ps.com/support
MDC_HPQ-12/25-D48 Series.B07 Page 13 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HPQ1225D48NL1C | 制造商:Murata Power Solutions 功能描述: |
| HPQ-12-D48_11 | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Isolated 300-Watt Quarter Brick DC/DC Converters |
| HPQ-12W | 制造商:MINI 制造商全称:Mini-Circuits 功能描述:POWER SPLITTERS/COMBINERS |
| HPQ-15 | 制造商:MINI 制造商全称:Mini-Circuits 功能描述:POWER SPLITTERS/COMBINERS |
| HPQ-15W | 制造商:MINI 制造商全称:Mini-Circuits 功能描述:POWER SPLITTERS/COMBINERS |
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