Scalable and plug and play reference solutions for two stage LED drivers
Modular LED lighting reference designs for LLC, buck and PFC flyback topologies
LED lighting has become a mature technology with stringent requirements on light quality. In order to achieve high light quality, there is a strong trend towards two-stage topologies. These two-stage topologies ensure that the light flicker or also called light ripple remains at low levels according to IEEE1789 and other new upcoming regulations. Within the dual-stage topologies, there is one topology that stands out due to its numerous advantages.
Primary constant voltage output, followed by a DCDC buck, enables benefits with regards to dimming, efficiency, cost and scalability. The power range can be scaled by deploying:
- single stage flyback with constant voltage output for up to 100W
- two-stage LLC with constant voltage output for above 100W up to multiple hundred watts
The features can be scaled by adding an MCU on the secondary to implement diverse features including Dali. Another way to scale features can be adding multiple channels to realize either:
- tunable white or
- high power levels
Infineon has solutions for both the primary ACDC stage as well as for the secondary DCDC buck stage. These solutions can be combined in a plug & play concept. In other words, depending on the requirements you can select and test the suitable ACDC stage and the best fitting DCDC stage.
In the following, you will find an overview of our existing solutions for both stages. This overview will be adapted once more solutions are available in the coming months.
This scalable reference design containing up to four-channels consists of a cost-effective DCM PFC stage realized by a combo controller ICL5102 that has been designed for LED drivers. Therefore it fulfills excellent power factor and THD values over a wide load range (see diagrams below). For precise current control, as well as deep dimming down to 0.5% and flicker-free light on the secondary side a buck topology such as realized with the ILD8150E.that has a breakdown voltage of 80V ensuring SELV designs with sufficient margin.
High-efficiency platform for high power designs, high light quality without flicker, balanced BOM performance.
For more information check our Application Note engineering report
This reference design is featuring a high power factor constant voltage digital flyback controller IC XDPL8219 with secondary side feedback. It presents excellent power quality over a wide load range. This design enables exchangeable feedback via pluggable extension boards on the secondary side, in this case now a high-side buck topology realized with ILD8150E featuring a breakdown voltage of 80V ensuring SELV designs with sufficient margin. For precise current control, as well as deep dimming down to 0.5% and flicker-free light this secondary sideboard comes in two available inductor versions for different frequency operation modes.
The platform for >40W power designs with high efficiency, hybrid dimming via one PIN down to 0.5%, high light quality for professional LED drivers
For more information check our application notes below:
