UCC2818APWG4

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The UCC2818APWG4 is an integrated power factor correction (PFC) with active snubber adn controller IC. It is designed to reduce harmonic distortion in power systems, providing a high degree of power factor correction and efficient operation while relying on a minimal amount of external components.The device is specifically designed for use in universal input range power supplies. It complies with the requirements of ECE Mark Directive 11 and other similar international standards. The UCC2818APWG4 can be used in both high and low power powering a variety of AC-DC, DC-DC and other electrical applications.

The UCC2818APWG4 has three primary operating modes: quasi-resonant mode; discrete mode; and high-voltage low power mode. In the QRM mode, an active snubber circuit is used to reduce the total harmonic distortion (THD). In discrete mode, the snubber is removed for higher efficiency. In the HVL mode, the device is used for low power applications such as telecom supplies. An integrated power good (PG) signal is generated when the controller operates in any of these three modes.

The device features spread spectrum modulation to reduce the peak switching noise. The phase shift control technique adopted ensures that the circuit operates in peak current mode control without the need of opto-couplers. The UCC2818APWG4 also features an over-voltage protection (OVP) to ensure that the output voltage never exceeds the system’s operational limit.

The UCC2818APWG4 also features a burst mode operation for enhanced system efficiency. In burst mode, the controller switches periodically at a frequency below the system’s normal operating frequency. This reduces standby losses and improves the system’s overall efficiency. To reduce the noise generated by the periodic switching, the UCC2818APWG4 also includes an advanced spread-spectrum function.

The UCC2818APWG4 is available in a compact 6-pin SOT-23 package. It is capable of delivering up to 3A output current in its QRM mode, and up to 2A in its Discrete mode. It also features a wide operating temperature range of -40 to 105ºC.

In summary, the UCC2818APWG4 is an integrated power factor correction (PFC) IC designed to reduce harmonic distortion and provide efficient operation to power supplies operating in a wide range of input voltages and outputs. It features three primary operating modes: quasi-resonant, discrete, and high-voltage low-power. It also incorporates advanced features such as spread spectrum modulation, phase shift control, power-good signal generation, over-voltage protection, and burst mode operation. The UCC2818APWG4 is available in a compact 6-pin SOT-23 package and is capable of delivering up to 3A output current.

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