TOP258YN

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Power management integrated circuit (PMIC) functions to regulate the voltage supplied to electronic components and devices. Traditionally, the PMICs are known as “voltage regulators” since they regulate the voltage applied to the electronic components or devices. PMICs come in various types, such as AC/DC converters, offline switchers, and Digital-to-Analog (D/A) converters. These different types of PMICs all have their own advantages and disadvantages and it is important to choose the appropriate type for the application. TOP258YN is an example of AC/DC converters. In this article, we will have an overview of the application field and working principle of the TOP258YN.

TOP258YN is a simple voltage regulator for cost-sensitive applications. It is capable of delivering up to 10 Watt output power from an input voltage from 8V to 100V. Its feature set includes soft start, external synchronization and auto restart, as well as DIP package wide temperature range of -40 to 85°C. It also features a low-profile SIP package with the same wide temperature range. The internal circuit of TOP258YN has two parts: an input part that operates in continuous mode and two switch-mode regulators. The input part consists of an active power factor correction (PFC) circuit and a current mode switching boost with an internal temperature compensation loop. The two switch-mode regulators are asynchronous buck and boost stages. In the buck stage, the output voltage is regulated using Constant On-Time (COT) control and the boost stage is controlled by Pulse Frequency Modulation (PFM).

The application field of TOP258YN is quite versatile and can include applications in the field of consumer entertainment, communication, computer, industrial control, automotive, and medical. It features the flexibility to accommodate a variety of input and output voltages. The most common application is the power supply and battery charger in notebook computers. Another popular application is the small home entertainment systems, such as DVD players and home theatres. The TOP258 also support applications in the automotive circuit, such as seat belt tightening, airbag deployment and window control.

TOP258YN has several features which make it suitable for low-input-voltage applications. For one, it has a built-in soft-start function that reduces the inrush current on startup and provides a smooth power-conversion experience without high peak currents. Secondly, it supports output overvoltage protection and thermal protection. Lastly, the PIN diodes inside the package provide a low-cost solution to reduce EMI/RFI interference.

TOP258YN is designed to operate using a hybrid approach, which combines the advantages of both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In CCM mode, the input part and the buck stage are supplied with the same current and the input to the buck stage is kept constant over the entire load range. This eliminates several switching losses and the ripple current in the input part. In DCM mode, the boost stage operates with pulse frequency modulation (PFM) control. This allows greater efficiency and more power to be delivered from a small package.

In general, the TOP258YN is a well-designed power management integrated circuit for a wide range of applications. The device features excellent performance and reliability, combined with a simple design. Its small size and wide temperature range make it attractive for embedded designs. The combination of continuous and discontinuous conduction mode is well suited to the low-input voltage application, which makes the device ideal for notebook computers, small home entertainment systems, and automotive circuits.

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