LNK6428E

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The LNK6428E is an integrated circuit designed for AC/DC power supplies with offline switching functions. It is manufactured by Power Integrations, an expert semiconductor company in the power management industry. The LNK6428E is a buck flyback power supply topology converter with a wide input voltage range (85-265VAC) and a wide output voltage range (0-24VDC). It is designed to provide cost-efficient, small size and high-performance solutions for high power and portable applications such as industrial, information technology, medical and telecom systems among others.

The IC features a full bridge zero voltage switching converters, minimum external components, integrated power MOSFETs, high power conversion efficiency, wide operating temperature range and a frequency modulation to reduce EMI interference.

The LNK6428E’s working principle is based on a Flyback topology. The device receives the AC mains input and then through an opto-isolator circuit it senses the power requirements of the load. The AC/DC converters turns switching off and on according to the load demand. A control loop monitors the output voltage and adjusts the flyback cycle to maintain the voltage level.

The switching scheme of LNK6428E is based on Zero Voltage Switching (ZVS) techniques and uses a resonant switch for average current control. The ZVS reduces switching losses and makes sure that the power device is always in the on or off state. When the switching frequency varies, the resonant switch ensures that the power device is retained in the off and on states. This ensures smooth operation of the converter, improved efficiency and lower EMI/RFI.

In addition, the device includes an adjustable reference voltage to optimize the switching times and filtering circuits to reduce the peak current output and excess noise. Furthermore, the IC features a self-protection system and an integrated self-timer to provide extra safety features to the system.

The LNK64283E is capable of providing a power output of up to 35W and can operate at frequencies up to 80 kHz. Its outstanding efficiency, wide input voltage range and low EMI/RFI emission makes it suitable for low cost and high performance applications such as computer peripherals, game consoles, consumer electronic, portable digital devices and white goods.

Overall, the LNK6428E is an excellent AC/DC offline switcher IC, capable of providing highly efficient, flexible and low EMI/RFI solutions for many different types of applications. It requires only minimal external components and is designed to provide a cost-effective and reliable solution for a variety of power supplies.

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