HVLED805TR Integrated Circuits (ICs)

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HVLED805TR Application Field and Working Principle

High Voltage LED Driver IC HVLED805TR is a three-state LED driver IC for automotive lighting applications. It is integrated with high voltage switch, charge pump, and protection circuitry. This driver IC provides solutions for driving high-power LED strings. It is highly efficient, achieving power factor >90%. Further, it has an integrated control voltage buffer to improve EMI performance. The enhanced device helps increasing the total system efficiency and reliability as well. This LED driver IC is highly suitable for automotive lighting applications.

Application

HVLED805TR is finding wide applications in automotive lighting such as:

• Front and rear turn signal lights
• Daytime running lights
• High beam lights
• Low beam lights
• Fog lights
• Taillights.

The architecture of HVLED805TR has been designed specifically for lighting applications in automobiles. This IC can be used in car headlight systems because of its low frequency regulator and low EMI solutions. Further, it features low current consumption at no load, which makes it perfect for applications like taillights. Due to its versatility, it is also used in varied applications like emergency lights, camera flash, and so on.

Working Principle

HVLED805TR is a buck-boost LED driver with a built-in power factor correction (PFC). It works by taking in a DC voltage ranging from 6 to 18V and regulating it to the required LED driver voltage. It consists of two voltage regulators, a high voltage switch and a charge pump. The two voltage regulators regulate the input voltage to generate a low voltage. The high voltage switch, also called the NFET, on the other hand, works as a controller of sensitivity to current, dynamic flow rate, and power dissipation of the switch. The charge pump is used to shift the output voltage either up or down.

The device uses a unique built-in power factor correction (PFC) scheme. The PFC scheme adjusts both the peak current and peak voltage, resulting in a power factor greater than 0.90. This helps to reduce power loss, eliminate input current harmonics, and provide peak power savings, thus ensuring the long-term operation of the system.

HVLED805TR offers high efficiency, low EMI and high current accuracy. It is capable of driving up to nine LEDs and provides flux-modulation protection and constant current protection. It offers accurate, repeatable and reliable control of the LED current, while the constant current output makes lighting effects very consistent and flicker-free across the entire system. The device also uses over-temperate protection and short-circuit protection to protect the connected LEDs and other devices.

Conclusion

HVLED805TR is a versatile LED driver IC used for automotive lighting applications. It is integrated with high voltage switch, charge pump, and protection circuitry, which not only makes it highly efficient but also increases the total system efficiency and reliability. HVLED805TR is capable to drive up to nine LEDs, provide flux-modulation protection, and constant current protection. It is highly suitable for taillights and emergency lights, high beam lights, daytime running lights, fog lights and so on.

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