LNK6404D-TL

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The LNK6404D-TL is a monolithic integrated circuit that combines high-voltage process and termination technology for offline AC / DC converters and offline switchers. This product was designed to provide an optimized solution for a variety of application fields. It can be used as a primary-side controller or a secondary-side synchronous rectifying controller.

The LNK6404D-TL offers integrated features that make it an ideal solution for its intended application fields. It incorporates a low-frequency, high-voltage, current-mode power factor correction (PFC) controller that provides improved line and load regulation compared to conventional PFC solutions. It also utilizes a high-side, high-current shunt switch that eliminates the need for a MOSFET or other large voltage drops.

In addition, the LNK6404D-TL provides protection and monitoring features, such as a temperature-sensitive oscillator, programmable overvoltage protection, and adjustable current limiting, to protect the system from hazardous conditions. It also includes a fan speed control to regulate the cooler\'s rotation speed for better thermal management and an overcurrent detection circuit for reliable operation.

The working principle of the LNK6404D-TL is based on a critical conduction mode (CCM) flyback topology, in which a high-side current sense resistor is used to detect the input current. This current is then compared to a reference current with a difference amplifier. The error signal generated by this comparison is then converted into a PWM signal by a controller. The output of the PWM signal is then used to switch the power switch of the flyback topology.

The PWM signal is also used to control the fan speed based on the temperature signal received by the temperature-sensitive oscillator. The output voltage of the LNK6404D-TL is then regulated by an adjustable overvoltage protection circuit. This circuit senses the output voltage and keeps it within the Safe Operating Area As part of the protection features, an adjustable current limit is also included to protect the system from hazardous events, such as overload or short circuit.

In summary, the LNK6404D-TL is a monolithic integrated circuit that incorporates high voltage process and termination technology for offline switches and AC/DC converters. Its critical conduction mode flyback topology, coupled with its safety features, make it an ideal solution for its intended application fields, such as power factor correction, overvoltage protection, current limit, and fan speed control.

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