AL5802-7 Integrated Circuits (ICs)

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The AL5802-7 is an LED Driver chip that belongs to the PMIC (power management IC) set. The AL5802-7 increases the power efficiency, saves labor costs, and reduces system size. It is an integrated chip that provides driving current sources for RGB LED strings with maximum ratings up to 150 mA per channel. The AL5802-7 also has protection functions such as over current, over voltage, and short-circuit protection.

The AL5802-7 is suitable for use in many LED applications, including LED backlight systems, LED signage, LED automotive lighting, LED industrial lighting, and general lighting for TVs. It features a wide input voltage range of 6-80 volts and has a built-in oscillator for driving the LED\'s in a variety of modes, including pulse-width modulation, dimming and ON/OFF.

The AL5802-7 employs a linear-mode architecture and to maintain a constant current throughout the voltage range, it uses a highly accurate ±5% adjustable current source. The power saving mode feature allows for efficient operation so the device can stay cool during operation and idle time, helping extend the total system lifespan.

The working principle of the AL5802-7 is straightforward. It uses two external resistors to set up the current sense voltage with a wide range. The current sense voltage is compared with the built-in reference voltage to generate a voltage drop and maintain constant current flow to the LEDs. The AL5802-7 will keep the LEDs at the designed current throughout the input voltage range. The output voltage can be up to 80V and the maximum output current is up to 150mA.

The AL5802-7 features an over temperature protection that will shut down the chip if the temperature reaches 165°C. This helps to prevent damage and potential fire by shutting down the LEDs when the temperature is too high. This protection feature is especially useful in LED applications that are exposed to high temperatures.

In summary, the AL5802-7 is a PMIC LED Driver that is suitable for a wide range of applications, including LED backlight systems, LED signage, LED automotive lighting, and LED industrial lighting. It has a linear-mode architecture, wide input voltage range, accurate adjustable current source, over temperature protection, and power saving mode to extend system lifetime. The basic operating principle of the AL5802-7 is to maintain constant current output to the LEDs throughout the input voltage range.

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