LT3474EFE-1#TRPBF

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PMIC (Power Management Integrated Circuit) is an essential component of modern electronics, and LED drivers are an important subcategory of PMIC. The LT3474EFE-1#TRPBF is a highly-integrated High Speed LED Driver with an adjustable folding current level. The chip offers outstanding performance for driving multiple LEDs at full-power for the entire input voltage range. This application note will discuss the key features, typical application field and internal working principle of the LT3474EFE-1#TRPBF LED driver.

Key Features of the LT3474EFE-1#TRPBF

The LT3474EFE-1#TRPBF is a high-efficiency LED driver that features a 3.2 V to 36 V input voltage range and allows for up to 2 A of output current per channel. It is capable of driving up to 8 channels and each channel has an independent control input, while using a single control output. This allows the driver to control the brightness of each channel individually, making it suitable for applications such as automotive lighting and most sign & display lighting. The LT3474EFE-1#TRPBF also features a wide-range PWM dimming. The PWM frequency can be adjusted from 200kHz to 9.5MHz, making it suitable for battery powered applications. The IC also offers integrated overvoltage and overcurrent protection, as well as short-circuit protection.

Typical Application Field

The LT3474EFE-1#TRPBF LED driver is ideally suited for automotive headlight applications, as it can provide the peak current necessary for the LEDs to run at full-power for the entire input voltage range. It is also suitable for applications such as automotive interior lighting, flexible displays and sign & display lighting. The wide-range PWM dimming and current level adjustment feature make this chip also suitable for handheld battery-powered applications.

Working Principle

The LT3474EFE-1#TRPBF works by taking an input voltage across its two supply pins, which is converted to a regulated internal supply voltage. The microcontroller then adjusts the duty cycle of the PWM signal in order to control the output current to the LEDs. The adjustable current level allows the user to adjust the peak current output to the LEDs and, consequently, their brightness. The chip also features an integrated overvoltage and overcurrent protection circuit, which will shut down the driver in case of excessive current or voltage on the output. The integrated short-circuit protection will also protect the chip in case of a short-circuit on the LED terminals.

Conclusion

The LT3474EFE-1#TRPBF is a versatile LED driver which can be used for applications such as automotive headlights, interior lighting, flexible displays and sign & display lighting. It features adjustable current level, wide-range PWM dimming and overvoltage/overcurrent protection. The chip is ideal for battery-powered handheld applications, as it can be adjusted to the desired frequency for optimal efficiency. This application note has discussed the key features, typical application field and internal working principle of the LT3474EFE-1#TRPBF LED driver.

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