TOP255YN

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PMIC (Power Management Integrated Circuit) solutions are constantly evolving to meet the needs of modern power converters, such as AC-DC converters, offline switchers, etc. TOP255YN is a PMIC that is specifically designed to address the needs of those power converters. This article will introduce the application field and working principle of TOP255YN, and explore how it can be applied to modern power converters.

TOP255YN Application Field

TOP255YN is a PWM (Pulse Width Modulation) offline power factor correction (PFC) rectifier designed for use in AC/DC (Alternating Current/Direct Current) offline power supplies. It integrates a power factor correction (PFC) controller and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) driver in the same package, and has an array of features that can greatly benefit AC-DC power supplies. Specifically, TOP255YN includes an internal phase-locked loop (PLL) which provides excellent dynamic performance, an input sense resistor that can be used to detect AC-input voltage and current, and an integrated power feedback circuit that provides low line regulation. Additionally, TOP255YN features an adaptive voltage positioning (AVP) control algorithm which significantly improves the power factoring performance, and a peak current mode control algorithm that further increases efficiency.

TOP255YN is designed for use in a wide range of AC-DC power supplies, from applications in home and office electronics, such as PCs and displays, to hot plug-in, small tabletop, and switch mode power supplies. Additionally, it can also be used to power other applications, such as DC-DC converters, LED lighting, motor drives, and battery charging systems.

TOP255YN Working Principle

TOP255YN employs a PWM (Pulse Width Modulated) power factor correction (PFC) control scheme to improve the power factor of an AC-DC power supply. The working principle of TOP255YN is based on switching the power MOSFETs rapidly to create a voltage waveform (also known as the input current waveform) that closely follows the input AC waveform. Since this waveform varies in duty cycle based on the average load on the power supply, it ensures that the PFC input current is in-phase with the input voltage waveform. Additionally, TOP255YN also employs a peak current-mode control scheme which further improves the efficiency of the power supply. The peak current-mode control scheme constantly adjusts the duty cycle of the MOSFETs to ensure that the input current does not exceed the desired peak value. The peak current-mode control also helps to limit the output voltage of the converter.

In addition to improving the power factor, TOP255YN also provides advantages such as improved dynamic performance, higher efficiency, and lower line regulation. The integrated PLL ensures excellent dynamic performance across a wide range of operating conditions, while the AVP algorithm and peak current-mode control help to further improve the efficiency and reduce line regulation.

Conclusion

TOP255YN is a PMIC that is specifically designed to address the needs of AC-DC power supplies. It features an array of features that can greatly benefit these power supplies, such as a PFC controller, integrated PLL, AVP algorithm, and peak current-mode control. Additionally, it can be used in a wide range of applications, from PCs and displays to DC-DC converters, LED lighting, motor drives, and battery charging systems. With its features and wide range of applications, TOP255YN is an ideal choice for modern AC-DC power supplies.

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