MAX6975ATL+T

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PMIC - LED drivers are special types of integrated circuits in the power management industry. One example is Max6975ATL+T, an LED driver that can be applied in various lighting fixtures. In this article, we will look in depth at the application field and workings principle of the Max6975ATL+T LED driver.

Overview of Max6975ATL+T

The Max6975ATL+T is a low-cost, fully integrated high-side LED driver that is optimised for driving TLC LED strips or strings. It’s suitable for single-cell or multic-eell LED lighting applications, and offers high efficiency, wide dimming range and low Overall System Cost (OSC). Its LED dimming range is 0.1% to 100% of the maximum light output, while its excellent regulation accuracy of 0.3% makes it suitable for use in a variety of lighting applications.

Max6975ATL+T integrates a rail-to-rail 0.5-A peak current driver, a 0-V to 3.2-V/4.0-V voltage regulator for LED string bias, and a low jitter programmable frequency triangle wave oscillator. It uses a load-independent, high peak current constant-frequency current control scheme, which enables the LED driver to remain stable even in dynamic LED temperature, current and voltage conditions. In addition, the high surge voltage withstand capability and the 50-kV HBM ESD level satisfy stringent safety requirements in outdoor lighting applications. As a result, the Max6975ATL+T is ideal for a variety of outdoor and indoor lighting fixtures.

Working of Max6975ATL+T

The Max6975ATL+T has four major components, namely, the 0.5-A peak current driver, the 0-V to 3.2-V/4.0-V voltage regulator, a low jitter programmable frequency triangle wave oscillator and a constant-frequency current control scheme. The peak current driver is used to control the dimming of the LED output and is operated in a constant frequency current control scheme.

The voltage regulator, meanwhile, helps to regulate the voltage across the LED load and keeps the supply voltage within a few tens of millivolts from the output voltage. The oscillator generates a triangle wave oscillation, which enables the driver to remain stable in varying LED temperature conditions. Finally, the current control scheme ensures that the current across the LED load is maintained at a constant level, thus avoiding any power fluctuations.

The Max6975ATL+T employs an enable input pin, an output enable pin, a series output pin and a serial enable pin. The enable input pin is used to enable or disable the LED driver, the output enable pin is used to enable or disable the LED output and the serial enable pin is used to turn on or off the LED driver’s internal regulated current source. The series output pin is used to regulate the current across the LED load.

Applications of Max6975ATL+T

Max6975ATL+T is an ideal solution for a variety of outdoor and indoor lighting applications. It is suitable for single-cell or multic-eell LED lighting applications, due to its wide dimming range and excellent regulation accuracy. Its load-independent current control scheme sends precise controllable current across the LED, while the surge voltage withstand capability and 50-kV HBM ESD level make it suitable for outdoor applications.

In addition, Max6975ATL+T can be used in a variety of lighting fixtures, including wall and ceiling lights, recessed lamps and spotlights. Its high peak current allows it to drive a large number of LEDs, while its low overall system cost makes it a great choice for cost-sensitive applications.

Conclusion

Max6975ATL+T is an excellent LED driver for a variety of lighting applications. Its wide dimming range, excellent regulation accuracy and load-independent current control scheme make it an ideal choice for single-cell or multic-eell LED lighting applications. Furthermore, its surge voltage withstand capability and 50-kV HBM ESD level make it suitable for outdoor applications. Finally, its low system cost makes it an attractive option for cost-sensitive applications.

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