TEA1742T/N1,118

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TEA1742T/N1,118 Application Field and Working Principle

The TEA1742T/N1,118 is an integrated PFC (Power Factor Correction) controller from NXP Semiconductors. This product integrates a full bridge synchronous rectifier (SBR) controller with a high-power factor correction (PFC) controller for isolated front end power supplies. With its switching frequency up to 132kHz and overload/over-temperature protection, this integrated circuit enables more efficient, lower-cost and more compact power supplies compared to conventional solutions.

It is suitable for wide range of applications from 100W to 400W and covers multiple input ranges from 85V to 265V AC. This product can also be used in low standby power solutions, such as LCD TVs and some types of refrigerator, which require below 1W standby power. The efficient PFC stage of TEA1742T/N1,118 can be used in both Power over Ethernet (PoE) and LED lighting circuits.

General Overview of TEA1742T/N1,118

The TEA1742T/N1,118 works by integrating a boost PFC controller with a full bridge synchronous rectifier (SBR) controller. The PFC controller achieves a high power factor with very low harmonic distortion. The boost converter regulates input voltage and ensures that the output voltage is not exceeding a maximum voltage limit by controlling the pulse width and duty cycle of the power switch. The SBR controller in the device provides fast switching with a fixed delay to begin the reverse current path upon detection of the zero crossing of the input voltage, thus avoiding any sub-harmonic distortion. The integrated device also includes a protection mechanism in order to improve system reliability.

Working Principle of TEA1742T/N1,118

The TEA1742T/N1,118 integrated PFC controller works by integrating a boost PFC controller and a full bridge synchronous rectifier. During each switching cycle, the output voltage is compared to the reference voltage, and the pulse width and duty cycle of the power switch is varied accordingly. The SBR controller begins the reverse current path upon detection of the zero crossing of the input voltage. This prevents the circulation of the output current during the part of the cycle when power is not flowing from the input, thus avoiding a phenomenon known as sub-harmonic distortion.

The TEA1742T/N1,118 integrated circuit also includes a comprehensive protection mechanism. This includes under VDS, over VDS, overload, over temperature and output current limit protection. Whenever any of these conditions is met, the device automatically shuts off the output to prevent damage to the power supply. These protective measures contribute to the reliability of the power supply.

Benefits of TEA1742T/N1,118

The main benefit of using the TEA1742T/N1,118 integrated PFC controller is improved efficiency. This controller is designed to operate at high switching frequencies up to 132kHz, resulting in lower losses. Furthermore, the low harmonic distortion of the controller enables the use of higher inductor values, thus reducing switching loss and improving overall efficiency. Finally, the integrated protection features of the controller not only contribute to reliable operation, but also reduce system costs.

Conclusion

The TEA1742T/N1,118 integrated PFC controller is a highly efficient and reliable solution for a wide range of applications. It is specifically designed for isolated front end power supplies and enables more efficient, lower-cost and more compact power supplies compared to conventional solutions. It combines a boost PFC controller with a full bridge synchronous rectifier, and includes a comprehensive protection mechanism to ensure reliable and safe operation.

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