AL5809-60QP1-7 Integrated Circuits (ICs)

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Overview of AL5809-60QP1-7 PMIC - LED Drivers

The AL5809-60QP1-7 is a pulse-width-modulated (PWM) voltage-adjustable LED driver device by Alpha & Omega Semiconductor Inc. This high power device belongs to AO\'s family of PMIC-LED drivers and is specifically designed to drive multiple strings of high-current LEDs. AL5809-60QP1-7 includes a DC/DC buck-boost controller, output current source drivers, and PWM dimming control circuit. It can operate from an input voltage range from 4.5V to 42V, and the output voltage can be adjusted from 1V to the input voltage. It has an integrated power MOSFETs with a maximum output current of 6A.

Applications

AL5809-60QP1-7 is suitable for a range of applications such as outdoor automotive lighting, outdoor industrial lighting and commercial lighting, including high bay lighting, street lighting, area lighting and so on. It is especially useful in powering multiple strings of high-brightness LEDs due to its ability to accurately regulate the output current and maintain high efficiency.

Features

AL5809-60QP1-7 has a range of features that make it suitable for its intended applications, such as:

• Wide input voltage range from 4.5V to 42V
• Output voltage can be adjusted from 1V to the input voltage
• Output current limit accuracy of ±10%
• Integrated power MOSFETs with maximum output current of 6A
• On/off control and dimming control
• Short circuit protection, over temperature protection and open LED protection
• Auto-recovery latch protection with adjustable time-out period
• Operating temperature range of -40°C to +85°C

Working Principle

The AL5809-60QP1-7 uses a DC/DC buck-boost converter topology implemented using integrated MOSFETs, inductor, and a wide adjustable output voltage. The operation of the converter is dependent on its two loop control circuits. The input voltage is sensed through an internal sense pin which allows for the output voltage to be regulated over a voltage range from 1V to the input voltage. The output voltage is increased or decreased through an internal voltage control miller capacitance (VCM) control loop that modulates the duty cycle of the converter.

The output current is regulated through a single-ended forward current mode loop that has an output current limit accuracy of ±10%. The current limit level is pre-set on the device, but also includes an adjustable offset, allowing it to be set up on the fly. The PWM dimming control circuit allows dimming through either an external PWM signal or an internal oscillator with adjustable frequency and period. The device also has the ability to turn off the output through an On/off control and a short circuit protection feature that shuts off the internal power MOSFETs when the output current reaches a certain threshold.

Conclusion

AL5809-60QP1-7 is a high power voltage-adjustable LED driver offering a wide input voltage range and programmable output from 1V to the input voltage. It features an excellent accuracy of output current limiting which makes it suitable for powering multiple strings of high-brightness LEDs. The highly integrated device also offers dimming control, over temperature protection, open LED protection and advanced overload protection in a single package, making it an ideal choice for a wide range of automotive and industrial lighting applications.

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