LNK362DN

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The LNK362DN is an efficient, low harmonic, off-line switcher integrated circuit designed specifically for ac/dc converter applications. It features a high current, capacitive mode, fixed frequency PWM controller, a 700 volts power MOSFET, and various protections to ensure trouble-free operation. This integrated circuit has been designed to operate in the universal input range of 85 to 265VAC and is appropriate for applications requiring a high efficiency.

Application Field

The LNK362DN is suitable for a wide range of applications, including the design of AC/DC converters in the following fields:

• Medical-grade power supplies
• Automotive applications
• White goods
• Low power LED drivers
• Uninterruptible power supplies (UPS)

Working Principle

The LNK362DN integrated circuit consists of the following components: a high frequency oscillator, PWM comparator, pulse transformer, power MOSFET, under-voltage lockout circuit, leading edge blanking, blanking output and thermal shutdown circuit. The operation of this integrated circuit can be expressed using the following steps:

• When the input voltage is applied, the oscillator starts up and applies a fixed frequency ripple (typically 500KHz) to the PWM comparator.
• The input voltage is sensed and compared to a set reference by the PWM comparator. The PWM comparator then produces an output signal that is used to switch the power MOSFET on and off.
• When the power MOSFET is off, energy stored in the leakage inductor is released and the output voltage is restored.
• During each switching cycle, the leakage inductor and output capacitors act as energy storage elements and allow the output voltage to remain constant during brief drops in the input voltage.

Protective Features

The chip is also equipped with several protective features which help to maintain the safe and reliable operation of the device:

• Thermal shutdown: If the die temperature exceeds a predetermined threshold, the circuit will enter thermal shutdown to protect the device.
• Under-voltage lockout: The UVLO circuit prevents the IC from operating under conditions of low input voltage.
• Leading edge blanking: This feature reduces current spikes during switching, thus reducing EMI emissions.
• Current limit: The current limit protection prevents the device from operating beyond its maximum specified current rating.
• Short-circuit protection: The integrated circuit is designed to protect itself in the event of a short circuit.

The LNK362DN is an ideal choice for AC/DC converter applications including those in the medical, automotive, UPS, and white goods industries. It features a fixed frequency PWM controller, a 700V power MOSFET, and several protection mechanisms to ensure safe and reliable operation.

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