NCP1252CDR2G

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The NCP1252CDR2G is a single-channel PFC (Power Factor Correction) controller, used with an N-channel MOSFET for the boost rectifier topology in the offline applications such as ac/dc adapters, power-factor rectifier, led lighting, chargers, and offline switchers.

Application Field

The NCP1252CDR2G is a versatile controller that can be used in a wide range of applications. It is well-suited for something as simple as powering a laptop or phone charger, as well as for powering larger ac/dc applications, like LED drivers. It\'s also perfect for ac/dc applications that require a low-cost, low-power solution.

The NCP1252CDR2G offers flexibility in design, as it has several features that make it well-suited for a variety of applications, such as adjustable frequency, adjustable peak current limit, and adjustable deadtime.

Working Principle

The NCP1252CDR2G uses a boost rectifier topology, which is a widely used power factor correction technique. The device is designed to detect the input voltage and adjust the PFC control loop parameters accordingly, allowing for higher power factor performance across the varying input voltages.

At the core of NCP1252CDR2G is a synchronous rectifier, which is a power semiconductor device that is used to efficiently convert alternating current (ac) to direct current (dc). It is designed to work with a fixed dc bus voltage, and is controlled by external gate signals that are generated by the NCP1252CDR2G controller.

The NCP1252CDR2G is capable of driving a high-side switch, a low-side switch, and a supervisory switch. The high-side and low-side switches control the power flow between an ac and dc bus, while the supervisory switch controls the logic level coming from the on-chip voltage sense circuit. This circuit is used to detect an over-voltage condition, ensuring that a safe operating point is maintained.

The high-side and low-side MOSFETs must be connected in a specific order, as the NCP1252CDR2G utilizes an asymmetric drive circuit. This means that the polarity of the high-side and low-side MOSFETs must be matched in order for the circuit to function properly.

NCP1252CDR2G also has a number of additional features, such as a chip-enable latch, a power-on reset, a fault monitor circuit, and an under-voltage lockout circuit.

Conclusion

The NCP1252CDR2G is a single-channel PFC (Power Factor Correction) controller, used with an N-channel MOSFET for the boost rectifier topology in the offline applications such as ac/dc adapters, power-factor rectifier, led lighting, chargers, and offline switchers. It offers flexibility in design and comes with a number of features, such as adjustable frequency, adjustable peak current limit, adjustable deadtime, and a fault monitor circuit.

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