Constant Voltage vs. Constant Current LED Drivers

When selecting an LED driver, one of the first questions is whether the application requires a constant voltage or constant current power supply. Although both types are designed to power LED lighting systems, they are intended for different types of LED loads. Choosing the correct type is important for stable operation and long-term reliability.

What Is a Constant Voltage LED Driver?

A constant voltage LED driver provides a fixed output voltage while the current varies according to the connected LED load.

Common output voltages include:

• 12V DC

• 24V DC

Constant voltage LED drivers are widely used with LED products that already include current-limiting components or are designed to operate directly from a fixed DC voltage.

Typical applications include:

• LED strips

• Cabinet lighting

• Wardrobe lighting

• Furniture lighting

• Display lighting

• Decorative LED lighting

For example, if an LED product is designed for 12V DC operation, a 12V constant voltage LED driver can be used as its power source.

What Is a Constant Current LED Driver?

A constant current LED driver is designed to maintain a specific output current. The output voltage changes according to the characteristics of the LED load.

Constant current drivers are commonly used for LED modules or LED luminaires that require a controlled current rather than a fixed voltage.

Typical specifications may be expressed as:

• 350mA

• 500mA

• 700mA

• 1050mA

The correct current and voltage range should be confirmed according to the LED manufacturer's specifications.

Key Difference Between Constant Voltage and Constant Current

The main difference is what the driver regulates.

How to Choose the Right Type

The simplest approach is to check the specifications of the LED product first.

If the LED product specifies:

12V DC

a 12V constant voltage driver is generally the appropriate choice.

If the LED product specifies a required operating current, such as:

700mA constant current

then a suitable constant current LED driver should be selected.

Using the wrong type of driver may result in unstable operation or damage to the LED system.

W&T Constant Voltage LED Driver Solutions

W&T ELECTRONICS CO., LTD. specializes in power supply products and constant voltage solutions for LED lighting applications. Our common 12V/24V constant voltage solutions include different current and wattage options, such as 12V 1A and 12V 2A models.

Depending on the application, we can provide suitable power supply solutions for cabinet lighting, furniture lighting, display lighting, LED strips, and other low-voltage LED applications.When selecting an LED driver, always confirm the LED product's voltage, current, total power, and application requirements first. If you need help selecting a suitable constant voltage LED driver, please contact W&T ELECTRONICS CO., LTD. with your LED specifications and application details.