LNK585DG

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The LNK585DG is an adjustable offline switcher IC from Power Integrations, a leader in power conversion technology. The LNK585DG is a highly efficient and cost-effective solution for a variety of ac/dc offline switching applications. This IC integrates a full-bridge PWM controller with a low on-resistance MOSFET driver to deliver solid performance, with a minimal number of external components.

The LNK585DG\'s operating voltage range is 32V to 74V, and it offers up to 1.5A of output current. The chip has a wide input frequency range of 45 KHz to 65 KHz, and is designed to meet EMI and IEC60950 standards. One of the main features of the LNK585DG is its adjustable frequency oscillator, which allows the designer to adjust the output frequency of the control signals, allowing adjustments of the output waveform.

The LNK585DG features integrated protection functions, including overvoltage protection, overcurrent protection, thermostat protection, open loop protection and over temperature protection. Its advanced LinkPower package technology ensures an extremely compact solution, with a total thickness of just 1 mm (excluding heatsink or other components).

The primary application field for the LNK585DG is offline power more than 5W. It is used in a variety of products, including lighting ballasts, monitors, notebooks, televisions, and embedded systems. The LNK585DG was designed to provide a low cost, high efficiency and high performance solution for offline SMPS applications.

The working principle of the LNK585DG is based on the pulse width modulation (PWM) technique. In this technique, the input power is modulated by changing the duration of the pulses. This results in a constant-voltage output, with a varying load current. The chip contains a variable frequency oscillator (VFO) which is used to generate the pulses. The pulse width is then determined by the VFO, based on the feedback from the output voltage. The output of the chip is then modulated by the PWM signals, to ensure a constant output voltage.

The LNK585DG also features an integrated low-side MOSFET driver which is used to drive the switches in the power stage. The chip also features a frequency fold-back feature which reduces the switching frequency at high loads, to improve system efficiency. The chip also features a soft-start logic, which prevents large current surges.

The LNK585DG is a highly efficient and reliable solution for offline switching applications. Its adjustable frequency oscillator allows the designer to easily adjust the output waveform and frequency. Its integrated protection features prevent damage to the system, due to excessive current or temperature. The chip also features a soft-start logic and frequency foldback feature, ensuring a low cost, highly efficient and durable solution for offline SMPS applications.

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