TOP266VG

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TOP266VG Application Field and Working Principle

TOP266VG is a high-performance switching current mode Pulse Width Modulation (PWM) controller primarily developed for low power off-line switching power supply applications.It provides the necessary features to implement low cost and high performance off-line switcher applications with minimal external components.This controller includes accurate current mode PWM control, over current shut-down protection, over voltage protection, operating frequency adjustment, stand-by/hiccup mode, as well as other features to provide high performance solutions.

TOP266VG is capable of controlling a wide range of AC-DC converters and eliminates the need for external current sense components or active feedback circuits due to its precise internal current limiting and voltage clamping circuitry. In addition, the operational frequency can be adjusted for maximum system efficiency. The high efficiency and low bill of materials can help reduce system cost compared to competing products.

TOP266VG\'s core features include Internal Soft-Start and VCC Under-Voltage Lockout (UVLO). The former eliminates the need for an external soft-start circuit while the latter improves converter stability and performance at start-up. This device supports stand-by mode and HI/LO level control for energy saving. The open loop current mode control ensures stability without the need for external loop compensation.

Working Principle

TOP266VG uses an internal zero crossing comparator and a leading-edge blanking circuitry to detect the mains voltage waveform for efficient power conversion. When the waveform crosses zero, the Power MOSFET is triggered ON and inductance starts to build the energy from the AC line. A frequency oscillator is used to control the ON time of the device until the requested peak current is met. The resulting waveform is then compared against the sensed output voltage waveform with an adjustable voltage loop. The oscillator frequency, current limiter and voltage loop are carefully calibrated to minimize the total losses in the system. When the set peak current/voltage is reached, the waveform is compared against the zero-crossing comparator and the MOSFET is switched OFF.

TOP266VG offers four modes of protection against overloads, short circuit and overvoltage conditions. First, there is an adjustable peak current limiter that protects the power stage against over-current conditions. Second, internal power supply overvoltage protection keeps the power stage protected from an overload greater than the rated voltage. Third, it also provides over temperature protection to protect the power stage from a temperature greater than the rated temperature. Finally, it also offers a manual shut-off or auto-restart feature which can be used to shut the device down or restart the device in case of a detected fault.

Conclusion

TOP266VG stands out as an innovative Pulse Width Modulation controller for AC-DC applications. It integrates a wide array of features and protection functions that greatly reduce the bill of materials and simplify the design of the system. Its high efficiency, low bill of materials, precise current and voltage control, as well as its robust protection features make it an ideal choice for low power off-line switching power supplies.

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