FAN7311G

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Power Management Integrated Circuits (PMICs), also known as power management chips, are essential components in a wide range of modern electronic circuits. PMICs serve to provide clean and efficient power supply to the various other components that make up the circuit, allowing them to function optimally. PMICs can be specialized to provide various features, one of which is the FAN7311G, a specialized PMIC manufactured by Semtech Corporation.

The FAN7311G is designed to provide quasi-resonant control of a power factor correction (PFC) converter. It is a low standby power Pulse Width Modulation (PWM) controller for quasi-resonant converters, featuring a start-up that draws zero current from the line, and an adaptive switching frequency for efficient operation.

The FAN7311G’s main application field is in PFC converters for AC/DC or DC/DC power supplies. In such applications, the device acts as a bridge between the input and output of the power supply, driving the intermediate PFC stage for clean power delivery. The device is also suitable for a variety of applications including street lighting, motor control, and Uninterruptable Power Supply (UPS).

FAN7311G employs several features in order to meet its design objectives. At start-up, it requires zero current from the line, allowing it to achieve a high power factor and keep the line current distortion in the minimum range. Additionally, it has a wide operational input voltage range from 85Vac to 305Vac. This range allows the device to be used in a wide variety of AC line sources. Once the voltage is in the desired range, the FAN7311G also constantly adjusts the switching frequency to reduce line disturbance and maintain high power efficiency.

The FAN7311G also features a flip-flop regulation mode, allowing it to automatically switch between two PWM frequencies according to the load specifications. Additionally, the device has a constant frequency and peak current control frequency at light load, allowing it to effectively minimize the power disruption with the changing load, while still keeping high power efficiency.

The FAN7311G also features protection against faults, allowing it to detect levels of current and voltage that are too high or too low, and shutting down the output of the power supply in these conditions, protecting it from malfunction or damage. This protection feature can save the power supply from suffering any sort of damage due to extreme conditions.

In conclusion the FAN7311G from Semtech is an important component for a number of power management applications, providing safeguards as well as ensuring power efficient operation throughout a wide input voltage range. It is a specialized PMIC, that helps maintain a clean and efficient power supply, in a range of power management systems, from PFC converters to Uninterruptable Power Supply systems.

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