TOP264VG

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The TOP264VG is a primary side control offline switcher IC integrated with over-current protection, enabling it to provide a wide range of applications such as AC/DC and buck/boost converters. As a main integrated component, it is highly reliable, cost-effective and easy to design for power applications that require accurate and precise control. This article will discuss the application field and working principle of TOP264VG.

Application Field:

TOP264VG is ideal for low-power AC/DC and buck/boost applications and can operate in an extremely wide input voltage range of 4.5V~400V. It has primary side control and requires no secondary feedback, making it very suitable for applications such as adapters, telecommunication, consumer products and industrial equipment that require small size and high performance. Moreover, TOP264VG adopts variable frequency design techniques and active frequency jitter, allowing it to reduce electromagnetic interference and further optimize the overall switching performance.

Working Principle:

TOP264VG consists of two major parts: the power switch and the control circuit. The power switch is used to maintain alternating current from the main and convert it into stable DC output. The control circuit is used to detect the output voltage and adjust the switching frequency accordingly. When the voltage rises above the reference value, the control circuit reduces the switching frequency, eventually reducing the output voltage. Conversely, when the voltage drops below the reference value, the control circuit increases the frequency, resulting in an increase in the output voltage.

The control circuit automatically adjusts the average output current (for CCM mode) or the peak current (for DCM mode) according to the feedback signal of the transformer rectifier bridge (TRB). In CCM mode, the average output current is inversely proportional to the output voltage, while in DCM mode, the peak current is slightly higher at lower output voltages. Furthermore, TOP264VGhas built-in over-current protection and thermal shutdown to protect the circuit from any damage due to overloading or overheating.

In summary, TOP264VG is an ideal component for low power AC/DC and buck/boost applications that require small size and high performance. It is highly reliable, cost-effective and easy to design. With its integrated over-current protection, it provides increased safety for your power supply application.

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