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| 型号： | HPQ-12/25-D48NBL1-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 12/16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
TECHNICAL NOTES
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard.
Input Reverse-Polarity Protection
If the input voltage polarity is reversed, body diodes of mosfets will become
forward biased and likely draw excessive current from the power source. If this
source is not current-limited or the circuit appropriately fused, it could cause
permanent damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
Because of the switching nature of DC/DC converters, the input of these
converters must be driven from a source with both low AC impedance and
adequate DC input regulation. Performance will degrade with increasing input
inductance. Excessive input inductance may inhibit operation. The DC input
regulation speci?es that the input voltage, once operating, must never degrade
below the Shut-Down Threshold under all load conditions. Be sure to use
adequate trace sizes and mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and speci?ed for input re?ected
ripple current and output noise using designated external input/output compo-
nents, circuits and layout as shown in the ?gures below. External input capaci-
tors (C IN in the ?gure) serve primarily as energy storage elements, minimizing
line voltage variations caused by transient IR drops in the input conductors.
Users should select input capacitors for bulk capacitance (at appropriate
frequencies), low ESR and high RMS ripple current ratings. In the ?gure below,
the C BUS and L BUS components simulate a typical DC voltage bus. Your speci?c
system con?guration may require additional considerations. Please note that the
values of C IN , L BUS and C BUS may vary according to the speci?c converter model.
V IN
until the rising input voltage exceeds and remains at the Start-UpThreshold
Voltage (see Speci?cations). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
TO
OSCILLOSCOPE
+
–
+
C BUS
L BUS
CURRENT
PROBE
C IN
+VIN
Users should be aware however of input sources near the Under-Voltage Shut-
down whose voltage decays as input current is consumed (such as capacitor
inputs), the converter shuts off and then restarts as the external capacitor re-
charges. Such situations could oscillate. To prevent this, make sure the operating
input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Delay
Assuming that the output current is set at the rated maximum, the Vin to Vout Start-
Up Delay (see Speci?cations) is the time interval between the point when the rising
input voltage crosses the Start-Up Threshold and the fully loaded regulated output
voltage enters and remains within its speci?ed regulation band. Actual measured
times will vary with input source impedance, external input capacitance, input volt-
age slew rate and ?nal value of the input voltage as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of the
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from inception to V OUT regulated assumes that
the converter already has its input voltage stabilized above the Start-Up Threshold
before the On command. The interval is measured from the On command until the
output enters 90% of its speci?ed regulation band. The speci?cation assumes that
the output is fully loaded at maximum rated current.
Input Source Impedance
These converters will operate to speci?cations without external components,
assuming that the source voltage has very low impedance and reasonable in-
put voltage regulation. Since real-world voltage sources have ?nite impedance,
performance is improved by adding external ?lter components. Sometimes only
a small ceramic capacitor is suf?cient. Since it is dif?cult to totally characterize
–
?VIN
C IN = 33μF, ESR < 200mΩ @ 100kHz
C BUS = 220μF, 100V
L BUS = 4.7μH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple and noise (also referred to as periodic and
random deviations or PARD) may be reduced by adding ?lter elements such as
multiple external capacitors. Be sure to calculate component temperature rise
from re?ected AC current dissipated inside capacitor ESR.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “?oating” with
respect to their input. The essential feature of such isolation is ideal ZERO
CURRENT FLOW between input and output. Real-world converters however do
exhibit tiny leakage currents between input and output (see Speci?cations).
These leakages consist of both an AC stray capacitance coupling component
and a DC leakage resistance. When using the isolation feature, do not allow
the isolation voltage to exceed speci?cations. Otherwise the converter may
be damaged. Designers will normally use the negative output (-Output) as
the ground return of the load circuit. You can however use the positive output
(+Output) as the ground return to effectively reverse the output polarity.
Minimum Output Loading Requirements
These converters employ a synchronous recti?er design topology. All models
regulate within speci?cation and are stable under no load to full load conditions.
all applications, some experimentation may be needed. Note that external input
capacitors must accept high speed switching currents.
www.murata-ps.com/support
MDC_HPQ-12/25-D48 Series.B07 Page 12 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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