MEAN WELL PWM-120 Series

Product Overview

The MEAN WELL PWM-120 series is a 120W AC/DC LED driver featuring constant voltage output with PWM style, ensuring stable color temperature and brightness homogeneity for LED strips. It operates from a wide input voltage range of 90-305VAC and offers models with rated voltages from 12V to 48V. With high efficiency up to 90.5% and a fanless design, it can operate in case temperatures from -40℃ to +90℃. The series is rated with IP67 ingress protection, making it suitable for dry, damp, or wet locations. The integrated dimming function allows for flexible control of LED strip brightness.

Key Features

• Constant voltage PWM style output
• Emergency lighting application compatible (according to IEC61347-2-13)
• Built-in active PFC function and Class II design
• Low no-load power consumption (<0.5W) / standby power consumption (<0.5W for DA/DA2-type)
• Fully encapsulated with IP67 level
• Function options: 3-in-1 dimming (0-10Vdc, 10V PWM signal, resistance); DALI/DALI-2
• Minimum dimming level of 0.2% for DALI type
• Typical lifetime > 50,000 hours and 5 years warranty
• Certifications include: EL, SELV, IP67, FC, CCC (optional), IS 15885, R-41027766, Type HL, CUL, CE, UKCA.

Applications

• LED strip lighting
• Indoor LED lighting
• LED decorative lighting
• LED architecture lighting
• Industrial lighting
• Type "HL" for use in Class I, Division 2 hazardous locations.

Model Encoding

The model number structure indicates voltage and function options:

PWM-120-XX

Where XX represents the rated output voltage (e.g., 12, 24, 36, 48).

Function options include:

• Blank: 3-in-1 dimming function (0-10Vdc, 10V PWM signal, resistance)
• DA: DALI control technology (for 12V/24V DA type only)
• DA2: DALI-2 control technology (for 12V/24V with DA2 Type only)

All models feature IP67 level protection.

Specifications

Dimming Operation

The PWM-120 series features dimming capabilities achieved by varying the duty cycle of the output current.

Dimming Principle: Dimming is accomplished by adjusting the duty cycle of the output PWM signal.

Output DC Current Diagram Description: A diagram illustrates the output DC current waveform, showing ON and OFF states, with TON representing the ON time and T representing the total period. The duty cycle is calculated as (TON / T) * 100%.

Output PWM Frequency: 1.47kHz for Blank/DA-Type, 2.5kHz for DA2-Type.

3-in-1 Dimming Function (for Blank-Type)

This function allows dimming via one of three methods applied between the DIM+ and DIM- terminals:

• 0-10VDC: Applying a voltage between 0-10V. The diagram shows the relationship between additive voltage input and the output duty cycle, where 0V corresponds to approximately 0.15% duty cycle and 10V corresponds to 100% duty cycle. Minimum dimming input is 0.6V for ~0.15% duty cycle.
• 10V PWM Signal: Applying a PWM signal with a frequency range of 100Hz to 3KHz. The diagram illustrates the correlation between the additive PWM signal's duty cycle and the output duty cycle. A 6% duty cycle input results in approximately 0.15% output duty cycle, while 100% input results in 100% output.
• Resistance: Applying a resistance. The diagram shows the relationship between additive resistance and output duty cycle. A resistance of 6KΩ or higher typically corresponds to ~0.15% duty cycle, and lower resistances (e.g., short) can reduce the duty cycle further. The minimum duty cycle is approximately 0.15% with an input of 6KΩ, 0.6VDC, or a 10V PWM signal with a 6% duty cycle. The duty cycle can drop to 0% with inputs less than 6KΩ, 0.6VDC, or a 10V PWM signal with a duty cycle less than 6%.

Note: The dimming source current from the power supply is typically 100μA.

DALI Interface (Primary Side; for DA/DA2-Type)

The DA and DA2 models support DALI (Digital Addressable Lighting Interface) control.

• Apply DALI signal between DA+ and DA- terminals.
• DALI protocol supports 16 groups and 64 addresses.
• The first dimming step is fixed at 0.2% of the output.

Performance Characteristics

The following graphs illustrate the performance of the PWM-120 series:

Output Load vs. Temperature

Two graphs show the relationship between load percentage and ambient temperature (Ta) or case temperature (Tc). The graphs indicate that derating is required at higher temperatures. For instance, at 45°C ambient, the load can be up to 100%, but at 70°C ambient, it may need to be reduced. Similarly, for case temperature, derating is necessary above certain limits (e.g., around 75°C for 100% load).

Static Characteristic

This graph illustrates the input voltage range (90-305VAC) and the corresponding output load percentage, showing that the driver operates effectively across this wide range.

Power Factor (PF) Characteristic

The graph shows Power Factor (PF) versus load percentage at Tcase = 80°C. It demonstrates that the PF remains high (above 0.9) across most of the load range for different input voltages (115V, 230V, 277V).

Total Harmonic Distortion (THD)

The THD graph shows Total Harmonic Distortion versus load percentage at Tcase = 80°C for different input voltages. THD is generally below 20% for loads above 60% (115/230VAC) or 75% (277VAC).

Efficiency vs. Load

Lifetime

The Efficiency vs. Load graph displays the efficiency percentage across various load levels for different input voltages. The PWM-120 series achieves high efficiency, up to 90.5%.

The Lifetime graph shows the expected lifetime in thousands of hours (Kh) as a function of case temperature (Tc). It indicates that the lifetime decreases significantly as the case temperature increases above approximately 50-60°C.

Technical Diagrams

Block Diagram

A block diagram outlines the internal functional stages of the PWM-120 series LED driver, including EMI Filter & Rectifiers, PFC Circuit, Power Switching, PWM & PFC Control, Rectifiers & Filter, Dimming Circuit, and Detection Circuit, with inputs and outputs labeled.

Mechanical Specification

The mechanical specifications provide the physical dimensions and mounting details for the driver.

Dimensions: 191mm (Length) x 63mm (Width) x 37.5mm (Height).

Diagrams are provided showing the physical layout, including AC input, DC output, and dimming connections for both Blank-Type and DA/DA2-Type models, along with critical dimensions and the location for Max. Case Temperature (Tc).

Installation and Cautions

Recommended Mounting Direction

A diagram illustrates the recommended mounting orientation for the LED driver.

Connection for Blank-type

A wiring diagram shows the connections for the Blank-type model, including AC input (L/N), DC output (+V/-V), and dimming connections (DIM+/DIM-).

Cautions

• Always disconnect power before installation or maintenance.
• Ensure proper ventilation and maintain 10-15 cm clearance from heat sources.
• Non-standard mounting or high ambient temperatures may require derating.
• Use cables with current ratings equal to or greater than the unit's.
• For waterproof connectors, ensure a tight linkage to prevent water intrusion.
• Dimmable models require dimming controllers capable of supplying 0.15mA per unit.
• Observe the maximum Tc (Case Temperature) limit indicated on the product label.
• DO NOT connect "DIM- to -V".
• Suitable for indoor/outdoor use, but avoid immersion in water for over 30 minutes.
• The power supply is a component; final EMC performance depends on the complete installation, requiring re-qualification by the equipment manufacturer.