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500

LIGHTING SOLUTIONS

Lighting Controls

CA452001EN - March 2015

LED Driver Selection

Why is a driver module required?

An LED (Light Emitting Diode) is a solid state device, or

semiconductor, which converts electricity passed through it into

visible light. To maintain the light output, colour, efficiency and

maximise the life of an LED, three factors must be controlled:

1. The manufacturing process and composition of the LED itself

2. Thermal management of the heat generated by the LED

3. The electrical supply to the LED

The driver is the device used to control the electrical supply to the

LED. The majority of luminaires in the Eaton’s LED ranges require

an LED driver. Some luminaires are supplied complete with the

appropriate driver, whilst others indicate on the product pages if a

driver is needed.

Driver Types

There are essentially two basic types of driver, those supplying a

constant current and those supplying a constant voltage. These

are then subdivided by other capabilities such as dimming or

colour changing.

Within the Eaton’s range there is a wide selection of drivers

offering different features and characteristics to provide the right

product for the application. There is a choice of constant current

or voltage outputs, different levels of Ingress Protection, Dimming

methods and Colour Changing versions as well as different

physical sizes.

Constant Current Drivers

The majority of luminaires operate on a constant current, however

not all constant current LEDs operate on the same current. It is

therefore important to note the recommended current for the

luminaire and select the appropriate driver. It is possible to operate

luminaires at a lower current than recommended though this will

reduce the light output and can affect the efficiency. If the current

is too high it may cause premature failure of the LED.

When connecting multiple luminaires to the constant current

drivers they must be wired in series.

Constant Voltage Power Supply Units

Some of the LED luminaires require a constant voltage, usually

12V DC or 24V DC. When connecting luminaires to these constant

voltage drivers they are wired in parallel.

Dimming Drivers

A selection of constant current dimming drivers are available

with different switching modes and control language protocol,

eg retractive switch, 1-10V, DMX and DALI

Colour Change Drivers

LEDs are often associated with colour options and the ability

to change the colour emitted from the same luminaire. This is

achieved by mixing the output from an array of individual Red,

Green and Blue LEDs or specialist ‘Tri-chip’ LEDs to generate any

colour of the visible spectrum. These products are referred to as

having the ‘RGB’ colour option. Several such drivers are included

in the range for various budgets, most are DMX compatible.

‘DMX’ is the type of software protocol used. (Not all luminaires

are offered with RGB colour change options).

Some drivers are multi-channel, typically 3 channel. For RGB

products each channel is dedicated to a colour, Red, Green, Blue.

For fixed colour product the number of luminaires connected

should be split evenly between each channel, eg for LS-PBX27

the maximum number of 1W LEDs it will operate is 27, split 9 per

channel.

Individual Connection

Series Connection

Parallel Connection

3 Channel fixed output multiple connection