300W 2"x4" AC-DC Open Frame Power Supply
MPI-S300 Series
Delivers 300W with fan cooling and 180W under convection cooling for diverse thermal management needs
Features a 2"x4" (50.8 x 101.6 mm) compact size and low profile design, ideal for space-constrained ITE systems
Achieves high efficiency (up to 92%) with an industry-leading ultra-low no-load power consumption (<0.1W), ensuring maximum energy savings
Certified to IEC/UL 62368-1 ITE safety standards
Meets EMI CISPR/FCC Class B and advanced PFC requirements (EN 61000-3-2 Class D / EN 61000-3-3)
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Item |
Conditions |
Min |
Typ |
Max |
Unit |
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Input Voltage |
Continuous input range |
85 |
115/230 |
264 |
VAC |
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Input Frequency |
AC input |
47 |
50/60 |
63 |
Hz |
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Input Current |
Nominal AC Input Voltage (115VAC) |
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3.5 |
A |
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Inrush Current |
Nominal AC Input Voltage (115VAC/230VAC), one cycle at 25°C cold start |
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60/120 |
A |
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No-load input Power |
Nominal AC Input Voltage (115VAC/230VAC) |
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0.1 |
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W |
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Switching Frequency |
Frequency conversion |
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72 |
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KHZ |
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Input Protection |
One non-user serviceable internally located AC input line fuse. Fuse：5A / 250VAC * 1pcs |
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OUTPUT |
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Item |
Conditions |
Min |
Typ |
Max |
Unit |
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Output Voltage |
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+12V |
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DC |
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Output Current |
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25 |
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A |
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Efficiency |
At input 230VAC, above 1hr. warm up (at 180W/ 300W) |
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94/ 92 |
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% |
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Initial Set Accuracy |
Initial setting accuracy is adjusted at input 115VAC and output at 60% rated load* |
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±1.0 |
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% |
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Minimum Load |
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0 |
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A |
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Hold Up Time |
Nominal AC Input Voltage (at 180W/ 300W) |
16/ 10 |
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mS |
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xLine Regulation |
Measured at rated load with ±10% change in input voltage 115VAC |
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±1.0 |
% |
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Load Regulation |
Measured from 60% to 100% rated load and from 60% to 20% rated load (60% ±40% rated load) |
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±1.0 |
% |
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Ripple & Noise |
Measured at rated load by a 20MHz bandwidth-limited oscilloscope and each output is connected with a 10μF |
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120 |
mV |
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Start Up Delay |
Time required for initial output voltage stabilization |
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1 |
3 |
Sec |
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Leakage Current |
At input 264VAC, 63Hz, rated load |
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1 |
mA |
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Overvoltage Protection |
For some reason the power supply fails to control itself, the build-in over voltage protection circuit will auto recovery the outputs to prevent damaging external circuits, the trigger point is around 120%~150% of output voltage |
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Short Circuit Protection |
Fully protected against output overload and short circuits. Automatic recovery upon overload condition |
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*Note: The rated load is 300W force cooled |
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ENVIRONMENTAL |
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Item |
Conditions |
Min |
Typ |
Max |
Unit |
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Operating Temperature |
See the following performance curves for the detail |
-20 |
+50 |
+80 |
°C |
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Storage Temperature |
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-40 |
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+85 |
°C |
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Relative Humidity |
Non-condensing |
5 |
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95 |
%RH |
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Cooling |
Forced-cooled when 181W~300W |
23.5 |
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CFM |
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Operating |
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5000 |
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m |
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MODEL SELECTION TABLE |
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Model Number |
Wattage (Convection cooled/ Force cooled) |
Output Voltage |
Output Current (Convection cooled) |
Output Current (Force cooled) |
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MPI-S303 |
180 W / 300 W |
+12 V |
15 A |
25 A |
MPI300 Series open-frame AC-DC power supply delivers up to 300W with fan cooling and 180W under convection cooling, all within a compact 2×4 inch (50.8 x 101.6 mm) footprint, making it ideal for space-constrained industrial and embedded systems. With efficiency up to 92% and ultra-low no-load input power below 0.1W, the MPI300 Series ensures maximum energy savings and optimized thermal performance. Designed for global compliance, it meets IEC/UL 62368-1 ITE safety standards and EMI CISPR/FCC Class B requirements. Its active power factor correction (PFC) complies with EN 61000-3-2 Class D and EN 61000-3-3, ensuring stable and reliable operation. Ideal for industrial automation, test and measurement equipment, IPC, and telecom systems, the MPI300 Series is a compact, efficient, and safe power solution for demanding applications.
