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Mean Well

Mean Well PLN-20-18 Power Supply 20W 18V - IP64 1.1A

fully isolated plastic caseIP64suitable for signage applications
SKU PLN-20-18
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Overview

PLN-20-18 is the 18V output model of this series: rated current 1.1A, rated power 19.8W, typical efficiency 81%.

Features

  • Universal AC input / Full range(up to 277VAC)
  • Protections:Short circuit/Over current/Over voltage /Over temperature
  • Cooling by free air convection
  • Built-in constant current limiting circuit with adjustable OCP level
  • Fully isolated plastic case
  • Built-in active PFC function
  • IP64 design for indoor or outdoor installations
  • Small and compact size
  • Class Ⅱ power unit, no FG
  • 100% full load burn-in test
  • High reliability,low cost
  • Suitable for Dry / Damp locations
  • Suitable for LED lighting and moving sign applications
  • 2 years warranty

Specifications

PLN-20-18Specifications from the official datasheet (2026-06-15 edition)

OUTPUT

DC VOLTAGE
18V
CONSTANT CURRENT REGIONNote.5
13.5 ~ 18V
RATED CURRENT
1.1A
CURRENT RANGE
0 ~ 1.1A
CURRENT ADJ. RANGE
75% ~ 100%
RATED POWER
19.8W
RIPPLE & NOISE (max.)Note.2
3.0Vp-p
VOLTAGE TOLERANCENote.3
±10%
LINE REGULATION
±3.0%
LOAD REGULATION
±10%
SETUP TIME
500ms / 230VAC 2000ms / 115VAC at full load

INPUT

VOLTAGE RANGENote.4
90 ~ 277VAC 127~392VDC
FREQUENCY RANGE
47 ~ 63Hz
POWER FACTOR
PF≥0.95/115VAC,PF>0.9/230VAC,PF>0.9/277VAC at full load (Please refer to "Power Factor Characteristic" curve)
TOTAL HARMONIC DISTORTION
THD< 20% when output loading≧75% at 115VAC/230VAC input and output loading≧75% at 277VAC input
EFFICIENCY(Typ.)
81%
AC CURRENT
0.4A/115VAC 0.2A/230VAC 0.15A/277VAC
INRUSH CURRENT(Typ.)
COLD START 35A(twidth=40μs measured at 50% Ipeak) at 230VAC
MAX. No. of PSUs on 16A CIRCUIT BREAKER
98 units (circuit breaker of type B) / 98 units (circuit breaker of type C) at 230VAC
LEAKAGE CURRENT
0.5mA / 240VAC

PROTECTION

OVER CURRENTNote.5
95 ~ 110% Protection type : Constant current limiting, recovers automatically after fault condition is removed
SHORT CIRCUIT
Hiccup mode, recovers automatically after fault condition is removed.
OVER VOLTAGE
19 ~ 22V Protection type : Shut off o/p voltage, clamping by zener diode
OVER TEMPERATURE
Shut down o/p voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-30 ~ +60℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +80℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.06%/℃ (0 ~ 50℃)
VIBRATION
10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS
IEC61347-1, IEC61347-2-13, TUV BS EN/EN61347-1, BS EN/EN61347-2-13, UL8750,CSA C22.2 No. 250.0-08, EAC TP TC 004,GB/T19510.1,GB/T19510.213,IP64 approved
WITHSTAND VOLTAGE
I/P-O/P:3.75KVAC
ISOLATION RESISTANCE
I/P-O/P:100M Ohms/500VDC / 25℃/ 70%RH
EMC EMISSION
Compliance to BS EN/EN55015,BS EN/EN61000-3-2 Class C(≥75% load);BS EN/EN61000-3-3,GB/T 17743, GB17625.1, EAC TP TC 020
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11;BS EN/EN61547, light industry level, EAC TP TC 020

OTHERS

MTBF
5217.1K hrs min. Telcordia SR-332 (Bellcore) ; 621.4Khrs min. MIL-HDBK-217F (25℃)
DIMENSION
148.5*38.5*28mm (L*W*H)
PACKING
0.18Kg; 60pcs/12.8Kg/0.9CUFT
Test conditions and notes10
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
  2. 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. Derating may be needed under low input voltage, please check the static characteristic for more details.
  5. 5. Please refer to "DRIVING METHODS OF LED MODULE".
  6. 6. The power supply is considered as a component that will be operated in combination with final equipment. Since EMC performance will be affected by the complete installation, the final equipment manufacturers must re-qualify EMC Directive on the complete installation again. (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)
  7. 7. Direct connecting to LEDs is suggested, but is not suitable for using additional drivers.
  8. 8. To fulfill requirements of the latest ErP regulation for lighting fixtures, this LED power supply can only be used behind a switch without permanently connected to the mains.
  9. 9. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
  10. 10. For any application note and IP water proof function installation caution, please refer our user manual before using. https://www.meanwell.com/Upload/PDF/LED_EN.pdf

Technical drawings

PLN-20-18 Mechanical Specification
Mechanical Specification
PLN-20-18 Block Diagram
Block Diagram
PLN-20-18 Derating Curve
Derating Curve
PLN-20-18 Power Factor Characteristic
Power Factor Characteristic
PLN-20-18 EFFICIENCY vs LOAD (48V Model)
EFFICIENCY vs LOAD (48V Model)

Downloads

FAQ

Can I use the PLN-20-18 for 18V LED strip lighting in a sign cabinet?

It can be used with 18V lighting loads up to 19.8W and 1.1A, provided the load fits the 13.5-18V constant-current range. For sign cabinet lighting, verify the 18V product is compatible with constant-current operation before selecting it.

Is the PLN-20-18 suitable for small signage lighting loads?

Yes, it can be used for small signage lighting. With 19.8W available at 18V, it is aimed at smaller compatible lighting loads rather than larger sign systems.

Can this driver be used for compact 18V decorative or display lighting?

It can support compact 18V lighting loads that stay within 19.8W and 1.1A. The IP64 enclosure also helps in spaces where dust or splashing water is a concern, as long as the lighting product matches the driver's output characteristics.

How do I estimate LED strip length for the PLN-20-18?

Use 19.8W divided by your strip's rated watts per meter to estimate the maximum length. Check your strip rated power per meter, and confirm the strip is an 18V load compatible with this driver's constant-current operation.

Can the PLN-20-18 be used outside?

Its IP64 enclosure is designed for dust protection and resistance to splashing water, which can suit outdoor or semi-exposed locations better than an open driver. It should still be used within the stated -30°C to +60°C operating temperature range.

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Other PLN-20 Models

3 other models
ModelPowerVoltageCurrentIP Rating
Mean Well PLN-20-24 Power Supply 20W 24V - IP64 800mA 19.2W 24V 0.8A IP64 View
Mean Well PLN-20-48 Power Supply 20W 48V - IP64 420mA 20.2W 48V 0.42A IP64 View
Mean Well PLN-20-12 Power Supply 20W 12V - IP64 1.6A 19.2W 12V 1.6A IP64 View
View all 5 PLN Series models
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Mean Well PLN-20-18 Power Supply 20W 18V - IP64 1.1A
Mean Well

Mean Well PLN-20-18 Power Supply 20W 18V - IP64 1.1A

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PLN-20-18 is the 18V output model of this series: rated current 1.1A, rated power 19.8W, typical efficiency 81%.

Features

  • Universal AC input / Full range(up to 277VAC)
  • Protections:Short circuit/Over current/Over voltage /Over temperature
  • Cooling by free air convection
  • Built-in constant current limiting circuit with adjustable OCP level
  • Fully isolated plastic case
  • Built-in active PFC function
  • IP64 design for indoor or outdoor installations
  • Small and compact size
  • Class Ⅱ power unit, no FG
  • 100% full load burn-in test
  • High reliability,low cost
  • Suitable for Dry / Damp locations
  • Suitable for LED lighting and moving sign applications
  • 2 years warranty
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