MEAN WELL LOP-300-27 is a low-profile, open-frame single-output AC/DC power supply with PFC. Its 27 V output is rated 6.7 A / 180.9 W by natural convection, or 11.1 A / 299.7 W with 10.98 CFM airflow. Peak output of 16.7 A / 450 W is limited to 3 seconds. Input voltage and temperature may require derating.
Product Datasheet
Download MEAN WELL LOP-300 Datasheet (PDF)
The LOP-300 section is on PDF pages 6, 7, 8, 9, 10. Refer to the complete mechanical drawings and notes when planning installation.
Model-Specific DC Output
Nominal output
27 V DC.
Continuous output, natural convection
6.7 A / 180.9 W.
Continuous output, 10.98 CFM airflow
11.1 A / 299.7 W.
Peak output, 3 seconds maximum
16.7 A / 450 W.
Ripple and noise, maximum
200 mVp-p.
Output-voltage adjustment
25.6–28.4 V using SVR.
Voltage tolerance
±1.0%.
Line / load regulation
±0.5% / ±1.0%.
Efficiency, typical
93%.
Select the appropriate continuous rating for the installed cooling. The 150% peak-load feature is limited to 3 seconds; it does not increase the continuous output rating. Apply the model-specific current and power limits together with the input and thermal curves.
Unless stated otherwise, measurements are at 230 VAC, rated load and 25°C. Ripple/noise uses 20 MHz bandwidth and a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Input, Timing and Auxiliary Supply
Input range
80–264 VAC or 113–370 VDC; 47–63 Hz for AC input.
Power-factor correction
Built-in PFC; PF >0.98 at 115 VAC and >0.95 at 230 VAC, full load.
Input current, typical
3.5 A at 115 VAC; 1.8 A at 230 VAC.
Cold-start inrush, typical
40 A at 115 VAC; 80 A at 230 VAC.
Leakage at 264 VAC
Earth leakage <500 µA RMS; touch current <70 µA RMS.
No-load consumption
Less than 0.5 W.
Set-up / rise time
1000 / 30 ms at 230 VAC; 1500 / 30 ms at 115 VAC, full load.
Hold-up time, typical
16 ms at 180 W load; 8 ms at 300 W load.
External-fan auxiliary output
12 V / 0.5 A with 10.98 CFM fan cooling; 12 V / 0.1 A without fan cooling. Tolerance −20% to +15% with the main output at 20% rated current.
Indicators and switching references
LED power indication; PFC 70 kHz and PWM 100 kHz block-diagram frequencies.
Protection
Short circuit / overload
105–150% of rated output power; hiccup after 3 seconds. Automatic recovery is specified at 3 seconds after the fault is removed.
Overvoltage
29.7–35.1 V; output shutdown, re-power on to recover.
Overtemperature
Output shutdown; automatic recovery after the temperature falls, or re-power on to recover.
Remove the fault and restore suitable cooling before returning the load to operation.
Cooling, Derating and Environment
Cooling arrangements
Natural convection at the lower rating, or an external 10.98 CFM fan for the forced-air rating.
Working temperature
−40 to +80°C, subject to the horizontal-installation derating curves. Convection curves end at 70°C; the fan-cooled curve extends to 80°C.
Forced-air temperature curve
With 10.98 CFM airflow: 90 W at −40°C, 240 W at −35°C, 300 W from −30°C through 50°C, 230 W at 60°C, 160 W at 70°C and 90 W at 80°C.
Convection temperature curves
Convection: at 115 VAC the 180 W plateau ends at 40°C and the curve passes 160 W at 45°C; at 230 VAC the plateau ends at 45°C and the curve passes 160 W at 50°C. Both reach 80 W at 70°C. Follow the plotted cold-temperature ramp below the plateau; −40°C is limited to 90 W.
Input-voltage derating
At 60 Hz, the load curve rises from 70% at 80 VAC to 100% at 115 VAC, then remains at 100% through 264 VAC.
Working humidity
20–90% RH, non-condensing.
Storage
−40 to +85°C; 10–95% RH.
Temperature coefficient
±0.03%/°C from 0 to 50°C.
Vibration
10–500 Hz, 2 G; 10 minutes per cycle, 60 minutes each along X, Y and Z.
The wattages in the thermal chart are series reference limits. Observe the model-specific output table concurrently; the chart is not an unconditional full-power rating across the entire input or temperature range.
Dimensions, Mounting and Connections
Dimensions, L × W × H
101.6 × 50.8 × 25.4 mm; drawing tolerance ±1 mm.
Mounting pattern
Four Ø3.3 mm holes on 95.25 × 44.45 mm centres; 3.175 mm edge references. Allow for the drawing’s maximum 3 mm underside projection.
Fan installation
The mechanical drawing places the 10.98 CFM fan 50 mm from the long board edge, with its position referenced 55 mm from the output edge. Direct airflow across the board as illustrated.
Class I / Class II mounting
For Class I systems, connect the mounting holes marked with the earth symbol to safety earth. Class II systems do not require that safety-earth connection.
AC input CN1
JST B3P-VH or equivalent: pin 1 AC/L, pin 2 no pin, pin 3 AC/N.
Main output CN2
JST B6P-VH or equivalent: pins 1–3 +V; pins 4–6 −V.
Input / output mating references
JST VHR housing family with JST SVH-21T-P1.1 contacts, or equivalents.
Fan output CN101
JST B2B-PH-K-S or equivalent: pin 1 +12 V auxiliary; pin 2 DC COM.
Fan mating references
JST PHR-2 housing and JST SPH-002T-P0.5S contacts, or equivalents.
Choose the complete VHR housing reference for the required circuit count and wire size. The connector list identifies mating references; loose housings, contacts and an external fan are not stated as included accessories. Follow the manufacturer installation instructions and maintain the required safety clearances.
Safety and Isolation
Medical insulation
Primary–secondary: 2 MOPP; primary–earth and secondary–earth: 1 MOPP each. The component is suitable for BF medical applications; the finished medical equipment requires its own compliance assessment.
Safety approvals listed
CB: IEC62368-1, IEC60335-1, IEC61558-1/-2-16 and IEC60601-1. TUV: BS EN/EN62368-1, 60335-1, 61558-1/-2-16 and 60601-1 (version 3.2). UL62368-1 and ANSI/AAMI ES60601-1 (version 3.2); CCC GB4943.1; RCM AS/NZS61558-1/-2-16; EAC TP TC004.
Overvoltage category and altitude
IEC/EN61558-1/-2-16: OVC III, up to 2000 m. IEC/EN/UL62368-1 and IEC/EN60335-1: OVC II, up to 5000 m. IEC/EN60601-1: OVC II, up to 4000 m.
Protective extra-low-voltage classification
For the catalogue’s 12–48 V models: SELV under IEC/EN61558-2-16, and SELV / ES1 under IEC/EN/UL62368-1.
Withstand voltage
Input–output 4 kVAC; input–FG 2 kVAC; output–FG 1.5 kVAC.
Insulation resistance
Input–output, input–FG and output–FG: 100 MΩ at 500 VDC, 25°C and 70% RH.
The supply is a component for installation in final equipment. Medical, electrical-safety and EMC requirements must be checked for the complete installation and its intended use.
EMC and Test Conditions
Conducted and radiated emissions
BS EN/EN55032 and BS EN/EN55011: Class I installation Class B; Class II installation Class A. BS EN/EN55014: Class I installation Class B.
Harmonics / flicker
BS EN/EN61000-3-2 Class A; BS EN/EN61000-3-3.
Immunity framework
BS EN/EN55035 and BS EN/EN61000-6-2.
ESD
EN61000-4-2 Level 4: 15 kV air; 8 kV contact.
Radiated RF
EN61000-4-3 Level 3: 10 V/m, 80 MHz–2.7 GHz; Table 9 proximity fields 9–28 V/m, 385 MHz–5.78 GHz.
EFT / surge
EN61000-4-4 Level 3, 2 kV; EN61000-4-5 Level 4, 4 kV line–FG and 2 kV line–line.
Conducted RF / magnetic field
EN61000-4-6 Level 3, 10 V; EN61000-4-8 Level 4, 30 A/m.
Dips and interruptions
EN61000-4-11: >95% dip for 0.5 period; 100% dip for 1 period; 30% dip for 25 periods; >95% interruption for 250 periods.
The specified EMC tests mount the unit on a 360 × 360 mm metal plate, 1 mm thick. Confirm the final equipment meets the applicable EMC requirements.
Weight, Reliability and Catalogue
Single-unit reference weight
210 g (0.21 kg), explicitly listed per unit in PACKING; not the shipping carton weight.
Carton packing
36 pieces / 10 kg / 0.95 CUFT.
MTBF, minimum estimates
2805.6 thousand hours under Telcordia SR-332 (Bellcore); 384.4 thousand hours under MIL-HDBK-217F at 25°C.
Warranty
3-year manufacturer warranty, subject to applicable terms.
Catalogue revision
LOP-300-SPEC, 2025-06-20; combined PDF pages 6–10.
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