Many medium voltage LED applications are powered by off-line AC-DC power supplies, batteries or electronic transformers with low voltage AC outputs. But some of these power supplies, such as lead-acid batteries, have only undergone simple regulation. Therefore, there is a need for an LED driver solution that can operate over a wide input voltage range and can be configured in a variety of topologies to support LED load requirements. Depending on the current and operating conditions of the LED, a linear or switching regulator LED driver solution can be used. ON Semiconductor offers a wide range of topologies for medium voltage LED applications for landscape lighting, low voltage track lights, solar powered lighting, automotive lighting, emergency vehicle lighting, marine lighting, 12 Vac/Vdc MR16 lights, aircraft interiors Various general lighting needs such as lighting, sign backlighting, billboard text circuits and signs.
Medium voltage LED general topology and power supply
Medium voltage LED lighting applications require an optimized driver solution. ON Semiconductor offers medium voltage LED driver solutions in three different topologies, including inductive, charge pump and linear, to meet different application needs. See Figure 1.
Figure 1: Example of LED landscape lighting
Figure 2: Example of three topologies
There are several power supplies for medium voltage LED applications, each with its main purpose. Among them, off-line AC voltage regulator adapters, common voltages of 12, 24, 36, 48 Vdc, voltage regulation accuracy of ± 5%, suitable for low to medium power applications with low safety requirements. Sealed lead-acid batteries, which are only widely regulated, 8 to 14 Vdc, are widely used in automotive lighting; 7-27 Vdc are used in automotive, solar, and marine lighting. 12 Vdc and 12 Vac power supplies, common in indoor lighting, track lights, outdoor lighting, landscape lighting, etc.
1) Linear LED driver solution
Linear solutions are the preferred method for many lighting applications because they are designed to be simple and intuitive, and allow LEDs to be driven with precision currents, regardless of how the LED forward voltage or input power is changing.
Because such LED drivers are linear, they must match the power requirements of the application. ON Semiconductor offers a wide range of constant current linearities from 10 mA up to 1 A