AL5811FF-7 Integrated Circuits (ICs)

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LED drivers are an important type of power management integrated circuit (PMIC) that regulate the current sent to light emitting diodes (LEDs). PMICs help to improve power system efficiency and minimize energy losses. They are used for controlling the amount of current flowing to a LED in order to maximize LED reliability and extend LED life. The AL5811FF-7 LED driver is a high-performance device from Anpec Electronics Corporation. It is designed to provide a constant current output with low ripple, while also providing effective operational protection features. This article provides an overview of the AL5811FF-7\'s application field and working principle.

Application Field

Anpec\'s AL5811FF-7 is a monolithic integrated circuit designed for driving LEDs, such as high-brightness white and blue LEDs. It is suitable for use in indoor and outdoor applications, such as automotive headlights, signage displays, power supplies, and more. The device features a constant current output, adjustable output voltage, high switching frequency, low output ripple, and various protection behaviors. It is available in a 8-lead SOP package.

Working Principle

The AL5811FF-7 is a step-down regulator that utilizes an internal high-voltage power switch to maintain a constant-current output. The device integrates a low-side current sensing circuit to accurately control the LED current. During normal operation, the inverting terminal of the current sensing amplifier is connected to the LED cathode (pin 3), while the non-inverting terminal is connected to a current sense resistor. The voltage across the current sense resistor is monitored by the current sense amplifier, which compares it to the reference voltage. If the voltage across the current sense resistor is greater than the reference voltage, the internal high-voltage switch is turned off for a short time to reduce the current flowing through the LED. By repeating this process, the device is able to maintain a constant current output.

The AL5811FF-7 also implements a slew-rate limiter to prevent an inductive kickback from occurring at the output. This function works by limiting the maximum rate of change of the output current (dI/dt) and avoiding large peak currents. Furthermore, the device features under-voltage lock out (UVLO) and adjustable output voltage protection. These protection functions protect the device from over-current and over-voltage failures and ensure the safe operation of the LED driver.

Conclusion

Anpec\'s AL5811FF-7 is a high-performance step-down LED driver specifically designed to provide effective protection features and maintain a constant current output with low ripple. It is suitable for driving high-brightness white and blue LEDs in automotive headlights, signage displays, and other indoor and outdoor applications. In addition, the device integrates a slew-rate limiter and under-voltage lock out (UVLO) protection to protect it from over-current and over-voltage failures.

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