THX208 Datasheet – Switching Power Supply Controller IC

The THX208 is High performance current mode PWM controller. Designed for cost-effective AC/DC converters. exist It provides nearly 4W continuous output power in a wide voltage range of 85V-265V. The optimized and highly rational circuit design combined with the high-performance and cost-effective bipolar manufacturing process saves the overall cost of the product to the greatest extent.

The power controller can work in a typical flyback circuit topology to form a compact AC/DC converter. The start-up circuit inside the IC is designed as a unique current sink method, which can use the amplification of the power switch tube itself to complete the start-up, which significantly reduces the power consumption of the start-up resistor; and when the output power is small, the IC will automatically reduce the operating frequency , resulting in an extremely low Standby power consumption. When the power tube is cut off, the internal circuit reverse-biases the power tube, directly using the CB high withstand voltage characteristic of the bipolar transistor, and greatly improving the withstand voltage capability of the power tube to a high voltage of 700V, which ensures the safety of the power tube .