TEA1721AT/N1,118

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The TEA1721AT/N1,118 is a PMIC – AC DC Converters, Offline Switcher integrated with current and voltage management circuit, over-voltage, over-power and temperature protection and has been designed to offer cost effective, space saving solution. It presents an ideal device in a variety of offline switching applications in both consumer and industrial markets.

This device provides power conversion in applications such as LED lighting and general white-goods appliances, where AC voltage is converted to the DC voltage necessary to power the machinery, such as cooks and washing machines. Offline Switchers are designed with provision of both active and standby mode operations and can offer low power dissipation, fast start-up and stable output voltage.

TEA1721AT/N1,118 is working according to the Pulse Width Modulated (PWM) control principle, which is a fast switchable current-frequency-control process. The PWM control algorithm is employed for all the operating conditions, thus offering high reliability and efficiency, optimizing the size of magnetic components.

In general, working principle consists of a high frequency transformer, an inverter bridge, an output capacitor and a few other components like a clamp for the secondary, etc. The high frequency transformer transfers the AC voltage from the inverter bridge to the output transformer,where the AC energy is transferred to the low voltage DC energy. The transformer secondary output voltage is rectified to provide the DC voltage.

To ensure a correct and smooth voltage output, the rectified voltage should be smoothened by the output capacitor. It is also connected with a current sense resistor so that the current sensing circuit can detect the output current. With the circuit in place, the voltage can be set and regulated with the current comparator.

To maximize efficient and reduce power losses, the TEA1721AT/N1,118 integrates with an over-voltage, over-power and temperature protection circuit. Over-voltage protection circuit is used to protect the circuit from over-voltage in either direction and over-power protection circuit protects the circuit from over-current in either direction. Both overcome the issue of large voltage or current variances that can lead to overheating or other damages.

Moreover, this PMIC – AC DC Converters, Offline Switcher has the capability to detect temperature changes, power on/off control, signal monitoring, signal conditioning, surge protection and dynamic on/off control. All these help in improving the system performance and minimizing the system power consumption.

To conclude with, TEA1721AT/N1,118 PMIC – AC DC Converters, Offline Switcher is an ideal device for a variety of offline switching applications with minimal power and space consumption. It works according to the PWM control principle and comes with over-voltage, over-power and temperature protection circuit.

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