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参数资料
| 型号： | HPQ-12/25-D48PXL2-Y |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 306 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-8 |
| 文件页数： | 14/14页 |
| 文件大小： | 794K |
| 代理商： | HPQ-12/25-D48PXL2-Y |
HPQ-12/25-D48 Series
Isolated 300-Watt Quarter Brick DC/DC Converters
www.murata-ps.com
email: sales@murata-ps.com
21 Feb 2011
MDC_HPQ-12/25-D48 Series.A07 Page 9 of 14
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, an internal diode 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 perma-
nent damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specications). 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.
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 Specications) 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 specied 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 VOUT 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 and remains within its specied regulation band. The specication
assumes that the output is fully loaded at maximum rated current.
Input Source Impedance
These converters will operate to specications 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 sufcient. Since it is difcult to totally characterize
all applications, some experimentation may be needed. Note that external input
capacitors must accept high speed switching currents.
APPLICATION NOTES
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 species 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 specied for input reected
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 (CIN 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 CBUS and LBUS components simulate a typical DC voltage bus. Your specic
system conguration may require additional considerations. Please note that the
values of CIN, LBUS and CBUS may vary according to the specic converter model.
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 reected AC current dissipated inside capacitor ESR. In gure 3, the
two copper strips simulate real-world printed circuit impedances between the
power supply and its load. In order to minimize circuit errors and standardize
tests between units, scope measurements should be made using BNC connec-
tors or the probe ground should not exceed one half inch and soldered directly
to the xture.
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 Specications).
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 specications. 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.
CIN
VIN
CBUS
LBUS
CIN = 33μF, ESR < 200mΩ @ 100kHz
CBUS = 220μF, 100V
LBUS = 4.7μH
+INPUT
INPUT
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
+
–
Figure 2. Measuring Input Ripple Current
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| HPQ-3.3 | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Isolated High Power Quarter Brick DC/DC Converters |
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