MEAN WELL LOP-500 series: Low-Profile Open-Frame AC/DC Power Supply with PFC - LOP-500-18

Description

MEAN WELL LOP-500-18 is a low-profile, single-output AC/DC power supply with active PFC. Its 18 V output is rated 300.6 W with natural convection or 500.4 W with 23 CFM airflow, with a 750.6 W peak limit for up to 3 seconds. Apply the model ratings and derating curves together.

Product Datasheet

Download MEAN WELL LOP-500 Datasheet (PDF)

The LOP-500 section is on PDF pages 16, 17, 18, 19, 20. Refer to the complete mechanical drawings and notes when planning installation.

Model and Selection

Complete model LOP-500-18.
Format LOP-500 open-frame power supply; 5 × 3-inch footprint and 30.5 mm profile.
Cooling options Natural convection at the lower output rating; external 23 CFM airflow for the forced-air rating.
System installation Class I with safety earth at the marked mounting holes, or Class II without safety earth; the corresponding EMC class limits apply.

Designed for industrial automation, controls, security and network equipment, electronic instruments, home automation and appropriately integrated medical equipment.

Output Ratings

Nominal DC output 18 V.
Natural-convection output 16.7 A / 300.6 W.
Output with 23 CFM airflow 27.8 A / 500.4 W.
Peak output, 3 seconds maximum 41.7 A / 750.6 W.
Ripple and noise, maximum 180 mVp-p.
Voltage adjustment 17.1–18.9 V using the SVR adjustment.
Voltage tolerance ±3.0%, including set-up tolerance, line regulation and load regulation.
Line / load regulation ±0.5% / ±1.0%.
Efficiency, typical 94.5%.

The peak rating is a short-duration limit, not a continuous output rating. Sustained loads must meet the applicable convection or forced-air current and power limits.

Unless otherwise stated, parameters are measured at 230 VAC input, rated load and 25°C ambient. Ripple/noise uses 20 MHz bandwidth and a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors.

Input, Timing and Leakage

Input range 80–264 VAC or 113–370 VDC; 47–63 Hz AC frequency.
Power-factor correction Built-in active PFC; PF >0.95 at 230 VAC and >0.98 at 115 VAC, full load.
AC input current, typical 5.2 A at 115 VAC; 2.9 A at 230 VAC.
Cold-start inrush, typical 40 A at 115 VAC; 80 A at 230 VAC.
No-load consumption Less than 0.5 W.
Set-up / rise time 1000 ms / 30 ms at 230 VAC; 1500 ms / 30 ms at 115 VAC, full load.
Hold-up time, typical 26 ms at 300 W load; 16 ms at 500 W load.
Earth / touch leakage Earth leakage <500 µA rms and touch current <70 µA rms, each at 264 VAC.
Block-diagram frequencies PFC 65 kHz; PWM 100 kHz.

Protection and Functions

Short circuit and overload 105–150% of rated output power; hiccup after 3 seconds, with automatic recovery after the fault is removed.
Overvoltage 19.8–23.4 V; output shuts down, re-power on to recover.
Overtemperature Output shuts down; recovery is automatic after cooling, or by re-power on.
Fan auxiliary supply 12 V at 0.5 A for a fan with 23 CFM cooling, or 12 V at 0.2 A without a fan. Tolerance −15% to +15% at 20% main-output rated current.
Remote sensing Compensates load-wiring voltage drop up to 0.5 V, using −R.S and +R.S on CN3.
Power-good / power-fail option Optional PG/PF: signal high after power set-up with 10 ms < PG delay < 500 ms; low at least 1 ms before the output falls below 90% of its rated value. Low level 0–1 V; high level 2–5 V.
Power-on indication LED indicator, identified in the mechanical drawing.

PG/PF is an optional function. Confirm that the ordered configuration includes this option before using CN3 pin 4; its listing does not make the option standard on every unit.

Cooling and Environment

Working temperature −40 to +80°C, subject to the horizontal-installation curves. Convection curves end at 70°C; operation at 80°C requires the stated forced-air derating.
23 CFM thermal curve 500 W through 50°C; plotted limits are 375 W at 60°C, 250 W at 70°C and 200 W at 80°C.
Natural convection at 115 VAC 300 W through 40°C, then 250 W at 50°C, 200 W at 60°C and 150 W at 70°C.
Natural convection at 230 VAC 300 W through 45°C, then 250 W at 60°C and 215 W at 70°C.
Input-voltage derating At 60 Hz: 70% load at 80 VAC, rising to 100% at 115 VAC and remaining at 100% through 264 VAC.
Humidity and storage Operating: 20–90% RH, non-condensing. Storage: −40 to +85°C and 10–95% RH, non-condensing.
Temperature coefficient ±0.03%/°C over 0–50°C.
Vibration 10–500 Hz, 2 G; 10 minutes per cycle and 60 minutes along each X, Y and Z axis.

The thermal curves are family power limits. Apply them together with the individual model’s output table and input-voltage derating; use the most restrictive applicable limit.

Mechanical Installation

Dimensions, L × W × H 127 × 76.2 × 30.5 mm; general drawing tolerance ±1 mm.
Mounting pattern Four Ø3.5 mm holes; 115.6 × 64.8 mm center spans with 5.7 mm edge offsets.
Underside clearance The drawing shows 3 mm maximum projection below the PCB; allow the required clearance.
Airflow arrangement An external 23 CFM fan is shown 5 cm from the long board edge. The plan view gives a 63.5 mm lateral alignment reference; follow its airflow direction.
Heat sinks HS1 and HS2 must not be shorted.
Grounding For Class I installations, connect mounting holes marked with the earth symbol to safety earth. Class II installations do not require the safety-earth connection.
Adjustment and fitted components The drawing identifies SVR, LED, FS1 and FS2. Use the complete mechanical drawing and manufacturer instructions when integrating the board.

Connections and Mating Components

AC input CN1 JST B3P-VH or equivalent: pin 1 AC/L, pin 2 no pin, pin 3 AC/N.
CN1 mating components JST VHR housing family and JST SVH-21T-P1.1 contacts, or equivalents.
Main DC output −V and +V screw terminals; M3.5 pan-head screws in two positions, maximum torque 8 lb-in (90 cNm).
Fan connector CN2 TKP 8812-2 or equivalent: pin 1 DC COM; pin 2 +12Vaux.
CN2 mating components TKP 2502 housing and TKP 54T(LF) terminals, or equivalents.
Function connector CN3 TKP DH2I-2X2 or equivalent: pin 1 −R.S, pin 2 +R.S, pin 3 DC COM, pin 4 PG (optional).
CN3 mating components TKP DH2 housing family or equivalent; select the matching TKP contact for the wire assembly.

Select the complete mating housing for the required circuit count and wire size. Loose mating parts and an external fan are not stated as included; the fan-supply rating and installation drawing do not specify a particular fan model.

Safety and Insulation

Safety standards CB: IEC62368-1, IEC60335-1, IEC61558-1/-2-16 and IEC60601-1. TUV: corresponding BS EN/EN standards, including EN60601-1 version 3.2. UL: UL62368-1 and ANSI/AAMI ES60601-1 version 3.2. CCC GB4943.1; RCM AS/NZS61558-1/-2-16; EAC TP TC004.
Medical isolation Primary to secondary: 2 × MOPP; suitable for BF medical applications when correctly incorporated into the final equipment.
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.
Safety voltage classification IEC/EN61558-2-16: SELV; IEC/EN/UL62368-1: SELV / ES1, within the listed 12–48 V model range.
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.

This is a component power supply. Confirm the required insulation, earthing, leakage, enclosure and safety classification in the completed equipment; component approvals do not certify the entire assembly.

EMC and Test Conditions

Emissions BS EN/EN55032 (CISPR32): Class I Class B, Class II Class A, conducted and radiated. BS EN/EN55014: Class I Class B.
Harmonics and flicker BS EN/EN61000-3-2 Class A; BS EN/EN61000-3-3.
Immunity standards BS EN/EN55035 and BS EN/EN61000-6-2, with the listed EN61000-4 tests.
ESD and radiated RF EN61000-4-2: Level 4, 15 kV air and 8 kV contact. EN61000-4-3: Level 3, 10 V/m at 80 MHz–2.7 GHz; Table 9, 9–28 V/m at 385 MHz–5.78 GHz.
Other immunity levels EFT Level 3, 2 kV; surge Level 4, 4 kV line–FG and 2 kV line–line; conducted RF Level 3, 10 V; magnetic field Level 4, 30 A/m.
Voltage dips and interruptions >95% dip for 0.5 period; 100% dip for 1 period; 30% dip for 25 periods; >95% interruption for 250 periods.

EMC testing uses a 360 × 360 mm metal plate, 1 mm thick. Reconfirm EMC performance in the final equipment with its actual wiring and mounting arrangement.

Weight, Reliability and Warranty

Single-unit catalogue reference weight 420 g from the explicit per-unit PACKING value. This is a catalogue reference, not a measured net or shipping weight.
Packing reference 0.42 kg per unit; 24 pieces / 12 kg / 1.02 CUFT.
MTBF, minimum estimates 1695.7 thousand hours, Telcordia SR-332 (Bellcore); 230.7 thousand hours, MIL-HDBK-217F at 25°C.
Manufacturer warranty Three-year manufacturer warranty, subject to applicable terms.
Catalogue revision LOP-500-SPEC, 2026-05-08; PDF pages 16–20.

MEAN WELL LOP-500 series: Low-Profile Open-Frame AC/DC Power Supply with PFC - LOP-500-18

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MEAN WELL LOP-500-18 is a low-profile, single-output AC/DC power supply with active PFC. Its 18 V output is rated 300.6... Read more

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    Description

    MEAN WELL LOP-500-18 is a low-profile, single-output AC/DC power supply with active PFC. Its 18 V output is rated 300.6 W with natural convection or 500.4 W with 23 CFM airflow, with a 750.6 W peak limit for up to 3 seconds. Apply the model ratings and derating curves together.

    Product Datasheet

    Download MEAN WELL LOP-500 Datasheet (PDF)

    The LOP-500 section is on PDF pages 16, 17, 18, 19, 20. Refer to the complete mechanical drawings and notes when planning installation.

    Model and Selection

    Complete model LOP-500-18.
    Format LOP-500 open-frame power supply; 5 × 3-inch footprint and 30.5 mm profile.
    Cooling options Natural convection at the lower output rating; external 23 CFM airflow for the forced-air rating.
    System installation Class I with safety earth at the marked mounting holes, or Class II without safety earth; the corresponding EMC class limits apply.

    Designed for industrial automation, controls, security and network equipment, electronic instruments, home automation and appropriately integrated medical equipment.

    Output Ratings

    Nominal DC output 18 V.
    Natural-convection output 16.7 A / 300.6 W.
    Output with 23 CFM airflow 27.8 A / 500.4 W.
    Peak output, 3 seconds maximum 41.7 A / 750.6 W.
    Ripple and noise, maximum 180 mVp-p.
    Voltage adjustment 17.1–18.9 V using the SVR adjustment.
    Voltage tolerance ±3.0%, including set-up tolerance, line regulation and load regulation.
    Line / load regulation ±0.5% / ±1.0%.
    Efficiency, typical 94.5%.

    The peak rating is a short-duration limit, not a continuous output rating. Sustained loads must meet the applicable convection or forced-air current and power limits.

    Unless otherwise stated, parameters are measured at 230 VAC input, rated load and 25°C ambient. Ripple/noise uses 20 MHz bandwidth and a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors.

    Input, Timing and Leakage

    Input range 80–264 VAC or 113–370 VDC; 47–63 Hz AC frequency.
    Power-factor correction Built-in active PFC; PF >0.95 at 230 VAC and >0.98 at 115 VAC, full load.
    AC input current, typical 5.2 A at 115 VAC; 2.9 A at 230 VAC.
    Cold-start inrush, typical 40 A at 115 VAC; 80 A at 230 VAC.
    No-load consumption Less than 0.5 W.
    Set-up / rise time 1000 ms / 30 ms at 230 VAC; 1500 ms / 30 ms at 115 VAC, full load.
    Hold-up time, typical 26 ms at 300 W load; 16 ms at 500 W load.
    Earth / touch leakage Earth leakage <500 µA rms and touch current <70 µA rms, each at 264 VAC.
    Block-diagram frequencies PFC 65 kHz; PWM 100 kHz.

    Protection and Functions

    Short circuit and overload 105–150% of rated output power; hiccup after 3 seconds, with automatic recovery after the fault is removed.
    Overvoltage 19.8–23.4 V; output shuts down, re-power on to recover.
    Overtemperature Output shuts down; recovery is automatic after cooling, or by re-power on.
    Fan auxiliary supply 12 V at 0.5 A for a fan with 23 CFM cooling, or 12 V at 0.2 A without a fan. Tolerance −15% to +15% at 20% main-output rated current.
    Remote sensing Compensates load-wiring voltage drop up to 0.5 V, using −R.S and +R.S on CN3.
    Power-good / power-fail option Optional PG/PF: signal high after power set-up with 10 ms < PG delay < 500 ms; low at least 1 ms before the output falls below 90% of its rated value. Low level 0–1 V; high level 2–5 V.
    Power-on indication LED indicator, identified in the mechanical drawing.

    PG/PF is an optional function. Confirm that the ordered configuration includes this option before using CN3 pin 4; its listing does not make the option standard on every unit.

    Cooling and Environment

    Working temperature −40 to +80°C, subject to the horizontal-installation curves. Convection curves end at 70°C; operation at 80°C requires the stated forced-air derating.
    23 CFM thermal curve 500 W through 50°C; plotted limits are 375 W at 60°C, 250 W at 70°C and 200 W at 80°C.
    Natural convection at 115 VAC 300 W through 40°C, then 250 W at 50°C, 200 W at 60°C and 150 W at 70°C.
    Natural convection at 230 VAC 300 W through 45°C, then 250 W at 60°C and 215 W at 70°C.
    Input-voltage derating At 60 Hz: 70% load at 80 VAC, rising to 100% at 115 VAC and remaining at 100% through 264 VAC.
    Humidity and storage Operating: 20–90% RH, non-condensing. Storage: −40 to +85°C and 10–95% RH, non-condensing.
    Temperature coefficient ±0.03%/°C over 0–50°C.
    Vibration 10–500 Hz, 2 G; 10 minutes per cycle and 60 minutes along each X, Y and Z axis.

    The thermal curves are family power limits. Apply them together with the individual model’s output table and input-voltage derating; use the most restrictive applicable limit.

    Mechanical Installation

    Dimensions, L × W × H 127 × 76.2 × 30.5 mm; general drawing tolerance ±1 mm.
    Mounting pattern Four Ø3.5 mm holes; 115.6 × 64.8 mm center spans with 5.7 mm edge offsets.
    Underside clearance The drawing shows 3 mm maximum projection below the PCB; allow the required clearance.
    Airflow arrangement An external 23 CFM fan is shown 5 cm from the long board edge. The plan view gives a 63.5 mm lateral alignment reference; follow its airflow direction.
    Heat sinks HS1 and HS2 must not be shorted.
    Grounding For Class I installations, connect mounting holes marked with the earth symbol to safety earth. Class II installations do not require the safety-earth connection.
    Adjustment and fitted components The drawing identifies SVR, LED, FS1 and FS2. Use the complete mechanical drawing and manufacturer instructions when integrating the board.

    Connections and Mating Components

    AC input CN1 JST B3P-VH or equivalent: pin 1 AC/L, pin 2 no pin, pin 3 AC/N.
    CN1 mating components JST VHR housing family and JST SVH-21T-P1.1 contacts, or equivalents.
    Main DC output −V and +V screw terminals; M3.5 pan-head screws in two positions, maximum torque 8 lb-in (90 cNm).
    Fan connector CN2 TKP 8812-2 or equivalent: pin 1 DC COM; pin 2 +12Vaux.
    CN2 mating components TKP 2502 housing and TKP 54T(LF) terminals, or equivalents.
    Function connector CN3 TKP DH2I-2X2 or equivalent: pin 1 −R.S, pin 2 +R.S, pin 3 DC COM, pin 4 PG (optional).
    CN3 mating components TKP DH2 housing family or equivalent; select the matching TKP contact for the wire assembly.

    Select the complete mating housing for the required circuit count and wire size. Loose mating parts and an external fan are not stated as included; the fan-supply rating and installation drawing do not specify a particular fan model.

    Safety and Insulation

    Safety standards CB: IEC62368-1, IEC60335-1, IEC61558-1/-2-16 and IEC60601-1. TUV: corresponding BS EN/EN standards, including EN60601-1 version 3.2. UL: UL62368-1 and ANSI/AAMI ES60601-1 version 3.2. CCC GB4943.1; RCM AS/NZS61558-1/-2-16; EAC TP TC004.
    Medical isolation Primary to secondary: 2 × MOPP; suitable for BF medical applications when correctly incorporated into the final equipment.
    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.
    Safety voltage classification IEC/EN61558-2-16: SELV; IEC/EN/UL62368-1: SELV / ES1, within the listed 12–48 V model range.
    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.

    This is a component power supply. Confirm the required insulation, earthing, leakage, enclosure and safety classification in the completed equipment; component approvals do not certify the entire assembly.

    EMC and Test Conditions

    Emissions BS EN/EN55032 (CISPR32): Class I Class B, Class II Class A, conducted and radiated. BS EN/EN55014: Class I Class B.
    Harmonics and flicker BS EN/EN61000-3-2 Class A; BS EN/EN61000-3-3.
    Immunity standards BS EN/EN55035 and BS EN/EN61000-6-2, with the listed EN61000-4 tests.
    ESD and radiated RF EN61000-4-2: Level 4, 15 kV air and 8 kV contact. EN61000-4-3: Level 3, 10 V/m at 80 MHz–2.7 GHz; Table 9, 9–28 V/m at 385 MHz–5.78 GHz.
    Other immunity levels EFT Level 3, 2 kV; surge Level 4, 4 kV line–FG and 2 kV line–line; conducted RF Level 3, 10 V; magnetic field Level 4, 30 A/m.
    Voltage dips and interruptions >95% dip for 0.5 period; 100% dip for 1 period; 30% dip for 25 periods; >95% interruption for 250 periods.

    EMC testing uses a 360 × 360 mm metal plate, 1 mm thick. Reconfirm EMC performance in the final equipment with its actual wiring and mounting arrangement.

    Weight, Reliability and Warranty

    Single-unit catalogue reference weight 420 g from the explicit per-unit PACKING value. This is a catalogue reference, not a measured net or shipping weight.
    Packing reference 0.42 kg per unit; 24 pieces / 12 kg / 1.02 CUFT.
    MTBF, minimum estimates 1695.7 thousand hours, Telcordia SR-332 (Bellcore); 230.7 thousand hours, MIL-HDBK-217F at 25°C.
    Manufacturer warranty Three-year manufacturer warranty, subject to applicable terms.
    Catalogue revision LOP-500-SPEC, 2026-05-08; PDF pages 16–20.

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