THL3504

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LED drivers are crucial components in many electronic applications like mobile phones or TV displays. The THL3504 is an LED driver developed by Texas Instruments. The device is a boosting high-power LED driver and is suitable for driving up to 10W LED string in series. It has an adjustable frequency booting architecture and supports AC/DC input voltage. This article will introduce the application field and working principle of THL3504.

Application Field

The THL3504 LED driver can be used in a wide range of LED lighting applications, such as general lighting, industrial lighting, automotive lighting, and even mobile and TV displays. The device has an adjustable frequency booting architecture with a wide input voltage range of 4.5V to 28V and can support up to 10W LED string in series. It can also be used for boost applications with low input voltage, such as 2 cell Li-ion battery powered applications.

The device also features a low quiescent current of just 50 μA, which helps minimize power consumption. Its adjustable frequency booting architecture further reduces switching losses, providing high efficiency and improved thermal performance. Furthermore, the THL3504 has an over-temperature protection and a user-adjustable current limit, making it a reliable solution for various LED lighting applications.

Working Principle

The THL3504 works on a boost topology with constan current output. The working principle is shown in the following figure:

As shown in the figure, when the device is enabled, the switch turns on, and current flows from the input source to the inductor. As the current increases, it builds up a magnetic field, which induces a voltage across the inductor. This voltage opposes the input voltage, thus restricting any further increase in current. The energy stored in the magnetic field is released to the output once the switch turns OFF. This process is known as the "flyback" effect, which powers the LED and provides a constant current.

The switching frequency of the device can be adjusted using an external resistor. This allows the device to operate at an optimal switching frequency, depending on the power requirements, hence improving efficiency and reducing power consumption. Additionally, the device is protected against over-temperature conditions, as it has a user-adjustable thermal protection.

Conclusion

This article has discussed the application field and working principle of the THL3504, a boosting high-power LED driver developed by Texas Instruments. The device can support up to 10W LED strings in series and has an adjustable frequency booting architecture, allowing it to be used in a wide range of LED lighting applications. Additionally, it has several protection mechanisms, such as a low quiescent current, over-temperature protection, and user-adjustable current limit, making it highly reliable for various LED lighting applications.

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