ALD605012PD131

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LED Drivers: ALD605012PD131 Application Field and Working Principle

Light-emitting diodes (LEDs) are the most common form of lighting technology today, due to their efficiency and long life. LED drivers are used to control the power and current supplied to LED components for optimum performance and reliability. Many LED drivers are based on integrated circuits, such as the ALD605012PD131 from Alpha & Omega Semiconductor (AOS). This IC is designed for driving and controlling multiple strings of LEDs in high-brightness LED applications.

The ALD605012PD131 is a constant current LED driver with a 0.5~1.2V constant output voltage range and a peak output current of 13.5A. It includes an LED dedicated power management element, and features programmable LED string current regulation, a programmable LED string current active protection threshold, and over-temperature and open/short LED string diagnostics. This chip is ideal for high-brightness applications where multiple LED strings need to be driven, such as automotive, home appliance, industrial, and other general lighting applications.

The ALD605012PD131 is a highly integrated chip that requires very few external components to drive multiple strings of LEDs. The chip integrates a high-side and low side power switch, and a dedicated open/short LED string current sensing circuit. Additionally, the chip is designed to minimize the amount of external components with its internal voltage reference, comparator, and current sense circuitry. The chip is also protected against over-temperature, over-current and over-voltage conditions using integrated thermal, current, and voltage protection.

The ALD605012PD131 can be operated in either fixed frequency current-mode or voltage-mode control. In current-mode operation, the chip regulates the LED string current by controlling the peak current limit and by setting a minimum pulse-width for the high-side and low-side power switches. In voltage-mode control, the chip regulates the LED string current by controlling the peak output voltage. The chip also includes an active protection feature which automatically disables the power switch if the LED string current exceeds a predefined level.

The ALD605012PD131 is a high-efficiency and reliable chip that can be used to drive multiple strings of LEDs in high-brightness LED applications such as automotive, home appliance, industrial, and other general lighting applications. With its integrated power management, open/short LED string current sensing, and active protection features, the chip helps reduce system cost while ensuring high performance, reliability, and thermal stability.

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