LNK520G

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The LNK520G is a monolithic, single-chip pulse width modulated (PWM) switch-mode power conversion integrated circuit (IC) highly applicable to the power supply design of medium-to-high power offline systems such as personal computers, office equipment and home appliances. This device is suitable for both AC-DC and DC-DC applications, having protected outputs and an array of features tailored for cost effective, low-component-count designs.

LNK520G belongs to Power Management IC (PMIC) category. Specifically, it belongs to AC DC Converters and Offline Switchers.

Working Principle

The device includes a free wheeling diode, a startup circuit, a valley voltage clamp, and a floating power switch, all of which can be controlled by the integrated control circuit. This makes the LNK520G ideal for single output flyback converter applications.

The typical operating procedure is the following: after a startup signal (RI) is applied, the power transistor is turned ON and the Control IC begins its internal ramp. When the ramp reaches its peak, the signal SENSE rises and compares with the reference voltage. When the voltage from SENSE is greater than the reference voltage, an internal oscillator at the Control IC starts to turn the transistor OFF. This starts the valley voltage clamp of the cycle.

The transistor is turned OFF again once the voltage from SENSE is lower than the reference voltage. The duty cycle of the output waveform is determined by the value of the sense resistor (the lower the resistor value, the higher the power transfer). The power of the switching power supply is regulated by the value of the feedback resistor.

Application Field

The LNK520G is a highly stable and efficient flyback converter, which allows designers to implement adaptive primary-side-regulated flyback converters with minimal component count. Its application field is specific, since it is highly suitable for systems that belong to the middle to high power range.

The LNK520G is suitable for large online systems such as server power supply applications, TV, computer monitors and peripherals, desktop and small-form-factor devices. It is also popularly used in low-component-count designs, such as notebook data storage systems, video-game consoles, car-chargers and other highly reliable systems.

The device also features integrated over-current protection, allowing it to be used in systems that require high precision current monitoring, even under high load conditions.

Conclusion

The LNK520G is an efficient and highly reliable PWM switch-mode power conversion integrated circuit (IC) highly applicable to the power supply design of medium-to-high power offline systems. It belongs to Power Management IC (PMIC) category and more specifically to AC DC Converters and Offline Switchers.

The device integrates a startup circuit, a valley voltage clamp, a free wheeling diode, and a floating power switch, all of them designed to be cost effective and low-component-count. Its application field is specific, being suitable for large online systems such as server power supply applications, TV, computer monitors and peripherals, desktop and small-form-factor devices, as well as for automotive electronics, video-game consoles and notebook data storage systems.

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