TEA1723DT/N1,118 Integrated Circuits (ICs)

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TEA1723DT/N1,118 is a high frequency offline AC/DC converter, which belongs to PMIC - AC DC Converters, Offline Switchers. It is especially suitable for usage in a medium power adapter-type application powering from a 220V AC network. Thanks to the presence of a leading-edge control curves, it successfully ensures high efficiency and low radio-frequency noise. The core of the circuit consists of a clocked oscillator, an opto-coupler and the power circuit with primary and secondary windings to provide galvanic isolation from the network. The main features of TEA1723DT/N1,118 are the Zero Voltage Switching (ZVS), the Burst Mode Operation (BMO), the internal slope compensation and the fixed peak current limiting. Furthermore, the wide loop bandwidth, the very low EMI levels, the high accuracy current limit, as well as the integrated Over Temperature Protection and the primary-side sensing circuit make it an ideal choice for a cost-effective AC/DC converter. The main part of TEA1723DT/N1,118 is the Clocked Oscillator, it controls the current that flows in the primary side of the converter, at the same time it ensures a constant frequency. The oscillator is triggered by the voltage across the primary winding. The frequency of oscillations is determined by the resistor-capacitor combination on pin4 of the IC. The operating frequency of TEA1723DT/N1,118 is 860kHz, providing an improved efficiency over the traditional frequency of 50~60kHz, as well as preserving the EMI level at a very low level. In addition, TEA1723DT/N1,118 has a Pulse Ring system, which means that every single switch has 2 pulses of current and it operates at a certain frequency depending on the applied load. This allows it to achieve Zero Voltage Switching (ZVS) of the transistor, allowing it to operate at higher speed and efficiency. Furthermore, Burst Mode Operation (BMO) is an added feature to TEA1723DT/N1,118, which ensures high efficiency in light load conditions. This is due to the fact that the oscillator controls the frequency and the duty-cycle, in a way that it increases the frequency and reduces the duty-cycle in light load, achieving high efficiency even in light load conditions. Another great feature of TEA1723DT/N1,118 is the primary-side sensing circuit. This is a current rectifying circuit that is connected to the primary side of the power circuit, providing a feedback signal to the control circuit. This signal is used to adjust the oscillator frequency and the duty-cycle, and it also serves as an over-current protection. The signal is rectified by the diode bridge and amplified by the n-channel FET and the amplifier, providing a generous tolerance range for the component values.Moreover, the TEA1723DT/N1,118 provides an integrated soft-start feature and adjustable slope compensation. The soft-start limit the inrush current to a set level at start-up, while the adjustable slope compensation help to reduce the output voltage overshoot. Another key component of TEA1723DT/N1,118 is the Current Limit Comparator. It is used to detect the output current limit, and it is adjustable through the RT pin. When the output current becomes above the limit, the comparator closes the opto-coupler, cutting off the power. Moreover, the Over-Temperature Protection (OTP) is also an important feature in TEA1723DT/N1,118 to ensure its operating temperature remains within the acceptable limit. If the junction temperature exceeds the preset limit, the OTP circuit turns off the switching. In conclusion, TEA1723DT/N1,118 is a highly efficient and cost effective PMIC – AC/DC converter with many useful features, including the Zero Voltage Switching (ZVS) and Burst Mode Operation (BMO), the internal slope compensation, the adjustable peak current limiting and the primary-side sensing circuit. It is ideal for medium power adapter-type applications, offering high efficiency and low EMI.

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