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diotec (Diotec Semiconductor AG)

Diotec Semiconductor AG

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Feb 22, 2024

Head- and Taillight – Driven by Diotec's 2SD1815TR-AQ Bipolar Power Transistor

Light-emitting diodes (LEDs) have ushered in a new era in the automotive industry, particularly in the lighting sector. Due to their advantages, such as their smaller size, high efficiency, lower power consumption and therefore energy savings, long life, and design freedom, LEDs are becoming increasingly the standard in automotive lighting.

When operating high-power LEDs, such as those used in automotive headlights, a stabilized current is required regardless of temperature and input voltage fluctuations, ensuring the LED's constant brightness during operation and increasing its lifetime. There are several solutions for driving power LEDs; one well-established discrete solution is to use a power bipolar transistor in D-PAK. Due to the linear output regulation, there is no on-board supply disturbance by EMI.

Diotec's power bipolar transistor series 2SDxx in TO-252AA/D-PAK is well suited for this application. The 2SD1815TR-AQ is a 3A, 100V NPN transistor with automotive qualification. Its D-PAK is compact and has a large heat sink to dissipate the thermal dissipation, which can be up to 20W.