ACT8727QLCHN-T

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PMIC, or Power Management Integrated Circuits, are integrated circuits (also known as chips) that control the turning on and off of electrical loads in response to various input conditions. One specific chip model, the ACT8727QLCHN-T, can be used in a variety of applications and has a complex working principle.

Applications

ACT8727QLCHN-T is a Linear Adaptive Power Control IC that is specifically designed for Switching Mode Power Supplies (SMPS). It can be used for high power factor switching mode power supply that improves energy efficiency. It’s useful for AC-DC Full Bridge (FB) power supply in applications such as lighting, audio, industrial equipments, and home appliances (washers, dryers, dishwashers, etc).

The chip is capable of providing high power factor, high efficiency, low cost, and low heat generation output across the specified input range. It is designed to operate with efficiency rates up to 95% and is compliant with EN55022 Class B, harmonic current limit requirements. The chip also has many integrated circuits that minimize external component count, reduce size and cost while improving flexibility. It is an ideal chip for applications requiring high power, high reliability, and/or high efficiency such as air conditioners, fans, and motors.

Working Principle

ACT8727QLCHN-T operates based on a closed loop control system that utilizes a specialized linear adaptive control (LAC) algorithm in order to achieve a high power factor (PF) and high efficiency across the working range of the SMPS. When operating in closed loop mode, the chip employs an analog Proportional-Integral-Derivative (PID) controller, a selector circuit, and a current limit circuit to achieve the desired power factor and efficiency output. The PID controller continuously adjusts the duty cycle of the converter in order to maintain a constant PF and efficiency, which is measured against an internal reference. The current limit circuit is responsible for limiting the maximum output current while the selectable external zero cross circuit is responsible for controlling the power switch on/off timing according to the zero crossing of the input voltage wave.

The chip is usually configured with a diode bridge and a primary PWM control circuit. The primary PWM control circuit is programmed to operate at a specific frequency, and this frequency is used to control the duty cycle of the power switch. The output voltage of the converter is measured and is used to generate an error signal that is the input to the PID controller. The error signal is then used to adjust the duty cycle of the converter, which in turn changes the output voltage of the converter. The current limit circuit is also used to maintain a safe maximum current through the converter at all times.

The chip is also equipped with several other features such as thermal protection, AC line surge protection, and programmable soft start. Thermal protection is a critical feature that protects the chip from operating at temperatures above the specified upper operating temperature limit, preventing it from burning out. AC line surge protection prevents damage caused by overvoltage or undervoltage conditions on the AC line, while the programmable soft start feature ensures that the converter starts up without overloading the supply line.

Conclusion

The ACT8727QLCHN-T is an ideal chip for applications requiring high power, high reliability, and/or high efficiency such as air conditioners, fans, and motors. It is designed to operate with efficiency rates up to 95% and is compliant with EN55022 Class B, harmonic current limit requirements. Its specialized linear adaptive control (LAC) algorithm provides a high power factor and high efficiency output across the working range of the SMPS, and its integrated circuits minimize external component count, reduce size, and cost while improving flexibility.

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