TOP247YN

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The TOP247YN is a high efficiency, universal input and output, frequency, three-terminal negative regulator. It can be used for a wide range of applications such, AC-DC converters, offline switchers, DC-to-DC converters, low noise and high-speed precision regulators, and battery chargers. This article will focus on the application field and working principle of the TOP247YN.

Application Field: The TOP247YN is the perfect solution for a wide variety of converters, switchers, and regulators. Specifically, the TOP247YN is suitable for single-ended primary-inductor converters (SEPIC), flyback converters, push-pull switched-mode power converters, and synchronous buck converters. These converters are ideal for applications like AC-DC power distribution with PFC circuits, backward converters, line supplies, and DC-DC voltage regulators.

The TOP247YN regulates voltage output with a wide input voltage range, while providing a high level of energy efficiency: from 85% to 93%. The frequency control of the TOP247YN helps control EMI, simplify transformer design, and reduce component count, allowing designers to build highly efficient and reliable power supplies.

Working Principle: The TOP247YN has three terminals, the voltage output terminal, the ground terminal(GND), and the voltage regulating terminal (Vreg). The TOP247YN works by monitoring the voltage across the output terminals, and adjusting its power output signal based on the difference between the actual output voltage and the desired output voltage. This signal is then used to adjust the inverting input of the power switch, either increasing or decreasing the power output so that the voltage across the output terminals matches the desired output voltage.

The TOP247YN also controls the switching frequency of the voltage regulator by using a pulse width modulation (PWM) to adjust the operating frequency of the power switch. This allows the designer to control the electromagnetic interference (EMI) generated by the power converter. The frequency is adjusted by the external capacitors which are connected to the Vreg terminal,and two resistors.

In addition to its voltage regulating and frequency controlling capabilities, the TOP247YN also offers current limiting protection and short circuit protection. The current limiting protection feature helps prevent the power switch from drawing too much current and thus, prevents damage due to excessive current. The short-circuit protection feature helps prevent the power switch from drawing too much current in the event of a short-circuit condition.

Overall, the TOP247YN is a highly efficient, universal input and output, frequency-controlled, three-terminal negative regulator that is suitable for a wide variety of applications, such as AC-DC converters, DC-to-DC converters, and low noise and high-speed precision regulators. With its voltage regulating and frequency controlling capabilities, the TOP247YN can help designers create highly efficient and reliable power supplies.

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