LED drivers support high-power, high-current apps

Article By : Infineon Technologies

Litix drivers allow cost-optimised full-LED front light applications for cars and motorcycles with space limitations in the handlebar’s headlamp.

LEDs in automotive front lighting enable energy savings, new light designs, and applications such as matrix beam and laser high-beam. Targeting the progress of automotive lighting, Infineon has launched high-power LED drivers within the Litix Power Flex series and the Litix Power series. They address flexible DC/DC driver software supporting LED systems of up to 50W and even above. Suitable application varies from many medium-power LEDs with string voltages of up to 55V to few LEDs with high currents of up to 3A and more.

Both LED drivers, the Litix Power Flex TLD5541-1QV and the Litix Power TLD5190QV, are well-suited for high-power and high-current LED applications. These include for example front lighting, laser and LED headlamps. They also suit high-efficiency supplies for LED applications working on battery voltage. Furthermore, they allow cost-optimised full-LED front light applications for cars and even motorcycles with their space limitations in the handlebar’s headlamp.

The Litix Power Flex series TLD5541-1QV synchronous H-bridge DC/DC controller is ideal for driving all high-power LED configurations with maximum system efficiency of above 92%. This results in higher reliability, improved thermal behaviour and reduced PCB size. Also, due to its optimised spread spectrum switching frequency, it helps reduce EMC emissions to fulfill challenging EMC requirements like CISPR 25 class 5. It also features seamless buck-boost regulation and fast dynamic load jump behaviour to support cost-optimised LED headlamps with complete protection and diagnosis. Just one TLD5541-1QV can drive two and more separately switched LED loads in one string, with up to 55V string voltage.

The Litix Power family of DC/DC converters and controllers targets medium- to high-power applications such as LED daytime running lights, and LED low-beam and high-beam. Their latest addition TLD5190QV is a synchronous H-bridge DC/DC controller with similar features as the TLD5541-1QV. Without SPI interface it particularly suits LED control electronics where no microcontroller is needed, while it is easy to implement. The device also offers integrated protection functions, both analog and digital (PWM) dimming and an adjustable switching frequency in the range of 200 to 700kHz.

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