NCP1605ADR2G Integrated Circuits (ICs)

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Power Factor Correction (PFC) is a technique used to reduce the amount of reactive power in an electrical circuit. The goal of PFC is to reduce power losses and improve power quality in electrical systems. The NCP1605ADR2G is a highly integrated power factor correction and offline converter controller designed to control fixed frequency power factor corrected (PFC) systems. This device provides an early warning of overcurrent and overvoltage conditions, allowing the system to react quickly and safely to these events. The device is designed to operate as an integrated PFC, eliminating the need for additional active components and providing efficient power conversion, enhanced power quality, and improved reliability.

The NCP1605ADR2G integrated PFC can be used in many applications, such as power supplies for AC/DC conversion, Uninterruptible Power Supplies (UPS), switched-mode power supplies (SMPS), and appliances. In addition, it is suitable for high efficiency applications, such as LED lighting and green IT applications. It is designed to meet safety and EMC requirements, under UL, EN and IEC standards.

The NCP1605ADR2G provides a range of features to help control an integrated PFC. It includes an integrated boost PFC pre-regulator with a wide voltage range, enabling compliance with power factor requirements over a large input range and reducing the need for multiple components. A programmable over-voltage protection (OVP) can be used to protect the system from overvoltage events.

The integrated integrated PFC controller also includes a selectable soft-start feature to prevent system inrush current and provide smooth startup. Additionally, the device includes a programmable input over-voltage comparator for protection, as well as a programmable peak current limit circuit to protect the power supply connected to the PFC and boost stages. Finally, the device provides integrated buck pre-regulation, enabling high efficiency in standby power applications.

The working principle of the NCP1605ADR2G is based on constant frequency current mode control. The circuit consists of two main parts: a control loop and a power stages. The control loop consists of a voltage loop, a current loop, and a frequency control loop. The voltage loop monitors the output voltage, adjusts the switching frequency through the frequency control loop, and compensates for any voltage variations. The current loop monitors the output current and provides current regulation. The power stages consist of a boost circuit, which provides regulation of the output voltage, and a main PFC stage consisting of a diode bridge and a FET switch.

The PFC stage consists of a switch (FET) and a diode bridge. The FET switch is connected to the control loop, and its duty cycle is adjusted according to the output voltage set point. The FET switch is programmed to operate at a constant frequency. The diode bridge provides a rectified AC-DC conversion and feeds the output capacitor, which maintains the output voltage. The diode bridge also reduces input voltage ripple, providing smoother DC voltage output. Finally, the diode bridge prevents the flow of electric current in the reverse direction.

In summary, the NCP1605ADR2G is a highly integrated power factor correction and offline converter controller designed to control fixed frequency power factor corrected (PFC) systems. This device provides an early warning of overcurrent and overvoltage conditions, allowing the system to react quickly and safely to these events. The control loop, consisting of the voltage loop, current loop, and frequency control loop, adjusts the switching frequency according to the output voltage. The power stages consist of a boost circuit and a main PFC stage consisting of a diode bridge and a FET switch. The FET switch is programmed to operate at a constant frequency, and the diode bridge provides a rectified AC-DC conversion and reduces input voltage ripple. This device is suitable for high efficiency applications, such as LED lighting and green IT, and is designed to meet safety and EMC requirements, under UL, EN and IEC standards.

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