LNK6665E

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The LNK6665E is an integrated circuit from Power Integrations that incorporates a controller and a 600V power MOSFET for use in flyback converters, forward converters, and offline buck and boost switching power supplies. It’s a highly integrated high voltage IC that can provide switching, primary side regulation, power factor correction and over current protection.

For flyback converters, the LNK6665E operates in the continuous conduction mode, where the flyback switch is initiated and the energy is stored, during each time the primary MOSFET is on. The MOSFET is then switched off and the stored energy is released, when the set point voltage is reached. For forward converters, the MOSFET is switched on when a preset peak current threshold is exceeded, and switched off when no further current is drawn. This ensures the MOSFET is not overstressed, and that regulation is maintained.

The LNK6665E also integrates a power factor correction (PFC) circuit that helps to improve the system’s performance. The PFC circuit monitors the input current waveform, and then adjusts the switching frequency in order to maintain the current waveform. It also includes a maximum current protection (MCP) that can detect certain fault conditions, such as a short circuit, and will then shut off the MOSFET to prevent damages from occurring. Furthermore, the over-temperature protection (OTP) will disable the MOSFET if the temperature exceeds a certain threshold, and will turn it back on once the temperature is below the threshold.

In order to interface with external components, the LNK6665E also provides two analog inputs, as well as a digital input and output pin. The analog inputs can be used to monitor the secondary output voltage or the current loop of the secondary side, and the digital input/output pin can be used to reset the MOSFET, or control the MOSFET. The three pins on the IC also provide gate driving signals, reference buffer, phase shift control and peak current limit, respectively.

Overall, the LNK6665E provides a wide range of features that can be used for a variety of applications, such as offline switching power supplies, off-line battery chargers, motor control circuits, and more. In these applications, the LNK6665E has the ability to regulate the output voltage, as well as provide over-current protection, power factor correction, and over-temperature protection. This makes it a perfect choice for designers who need an easily integrated, efficient and reliable solution for their projects.

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