TOP269KG

AC DC converters are electrical devices for transforming electrical power between two or more alternating current (AC) or direct current (DC) sources. AC DC converters are also known as DC-to-DC converters or AC-to-DC converters. With the advancements in microelectronics technology, the power handling capability of AC DC converters has increased substantially. Offline switchers are non-isolated DC-DC converters that switch input power directly to the load, without the use of an isolation transformer or any other form of electrical isolation.

TOP269KG is a very efficient, high-voltage, low-cost, AC/DC full-bridge PWM converter IC with both synchronous rectification and synchronous reverse-polarity power-on-reset (POR) protection. It uses advanced PMIC technology to deliver up to 8A of current with fixed 5.5V and 10.5V buck and boost output voltages. This device is also capable of operating at frequencies of up to 200kHz. The TOP269KG is suitable for a wide range of AC-DC and DC-DC applications such as LED lighting, switch mode power supplies, and chargers.

TOP269KG Application Fields

TOP269KG is an efficient and low-cost solution for AC/DC full-bridge PWM converter applications. It offers an adjustable output voltage range of 5.5V to 10.5V, and a wide input voltage range of 4.5V to 24V. Due to its high level of integration and low-cost, it is ideal for low to mid power applications such as low power chargers and Switch Mode Power Supplies (SMPS). TOP269KG can also be used in industrial applications, such as AC power supplies, AC/DC converters and DC/DC converters.

TOP269KG is also suitable for high-brightness LED (HB-LED) lighting applications. It provides a smooth dimming feature, which allows for the adjustment of output power according to different operating conditions. In addition, it offers protection features for over voltage, over temperature and reverse-polarity. The device is RoHS compliant and is certified to EN 60950 and UL 60950 safety standards.

TOP269KG Working Principle

The working principle of TOP269KG involves the conversion of AC input to DC output. The device integrates a full-bridge resonant circuit and a synchronous rectifier. The device starts in the diode bridge topology, providing a constant voltage output, until the peak current is reached. At that point it switches over to the synchronous rectifier to provide higher efficiency.

TheTOP269KG uses a frequency dependent current mode control. A maximum on-time is decided for the switching and a short current limit is also employed. The switch is then kept on until the current is less than the limit. The device also includes an adjustable soft-start feature, to minimize inrush current during start-up. This feature also helps protect the circuit from high inrush current. The device also has a programmable frequency shift feature to reduce noise emission.

To ensure an uninterrupted power supply, TOP269KG features overvoltage and overtemperature protection, as well as synchronous reverse-polarity power-on-reset (POR) protection. All these features make it an ideal solution for high voltage AC/DC and DC/DC applications.

Conclusion

TOP269KG is a very efficient, high-voltage, low-cost, AC/DC full-bridge PWM converter IC with both synchronous rectification and synchronous reverse-polarity power-on-reset (POR) protection. It is suitable for a wide range of AC-DC and DC-DC applications such as LED lighting, switch mode power supplies, and chargers. The device provides protection features for over voltage, over temperature, and reverse-polarity and is certified to the EN 60950 and UL 60950 safety standards. The TOP269KG is an ideal solution for high voltage AC/DC and DC/DC applications.