LNK500P

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The LNK500P power supply IC from Power Integrations is designed to deliver a highly efficient offline switching power supply made up of AC-DC converters. This makes it well suited for applications in personal computers, set-top boxes, and other digital devices. The LNK500P is a simplified, robust, and reliable AC-DC converter package. It integrates a primary side controller, MOSFETs, a feedback resistors, an opto-coupler, and a power diode in a single package.

The LNK500P is a single-stage power supply converter that combines primary-side regulation and switched-mode power conversion. This reduces the number of components and makes the power supply less complex while maximizing efficiency. It is capable of delivering 80+ power factor correction, up to 85% efficiency, and up to 1A continuous output current. It is also capable of delivering up to 35W power output.

The working principle of the LNK500P is based on the concept of primary-side regulation. In this type of topology, the switching frequency and duty cycle are determined by a ramp signal that is generated by a linear regulator, which is located on the primary side of the power supply. To regulate the output voltage, the controller compares the feedback signal with a reference voltage. When the voltage becomes too low, the regulator will increase the switching frequency, thereby increasing the width of the duty cycle.

The LNK500P operates in discontinuous conduction mode (DCM). This enables it to provide better efficiencies than continuous conduction mode (CCM) devices. Additionally, it supports PWM dimming with a smooth transition and a wide dimming range of between 0.1% and 100%. It also features a standby power mode with an adjustable threshold voltage. This helps reduce the total system cost by reducing the level of standby power.

The LNK500P includes an active burst mode function which helps improve system efficiency at light loading conditions. It also has a built-in fault protection system that can detect and protect against various power supply faults such as over voltage, over current, short circuit, and over temperature. Additionally, it has a low-power sleep mode that reduces the power consumption when the load is low.

Overall, the LNK500P is a versatile and reliable power supply IC that is well suited for a wide range of applications. It is easy to integrate and provides a high level of performance and efficiency. Its primary-side regulation, active burst mode, and PWM dimming features help reduce system cost and power consumption, making it an ideal choice for many applications.

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