Summary:

CX7172 is a high-performance multi-mode PWM flyback controller. This product facilitates users to design high-performance AC/DC conversion switching power supplies with fewer peripheral components and lower system costs.

CX7172 provides extremely comprehensive and high-performance intelligent protection functions, including cycle by cycle overcurrent protection, overload protection, soft start, chip over temperature protection, VDD under voltage locking protection, VDD over voltage locking protection, secondary rectifier short circuit protection, programmable output over voltage protection, and programmable over temperature protection.

CX7172 chip has the function of automatically identifying load size and adjusting working mode. Under full or heavy load conditions, the chip operates at a fixed frequency of 65KHz. When the load is reduced, the chip enters valley switching mode, while the operating frequency is reduced, effectively reducing switch losses When the load is under extremely light or empty load conditions, the chip is in interval mode.

CX7172 is equipped with intelligent dithering technology, which not only reduces the electromagnetic interference generated by the system in frequency reduction mode, but also effectively reduces output ripple The unique working mode of the chip minimizes audio energy and eliminates audio noise.

CX7172 adopts SOT23-6 packaging, providing a good design platform for high cost performance flyback switching power supply systems that require ultra-low standby power consumption. It is very suitable for applications that meet Level 6 energy efficiency and the European energy-saving standard Eur2.0.

Features:

• Built-in soft start function

• Built in line voltage compensation (OCP)

• Built in slope compensation

• Intelligent Dithering Technology for Improving Electromagnetic Interference

• Ultra low starting current

• High noise immunity

• Multimode control

• Programmable output overvoltage protection

• Programmable over temperature protection

• Full load fixed 65KHz frequency

• Medium load valley bottom switching mode

• Light load interval mode

• Accurate overload protection function

• Cycle by cycle overcurrent protection function

• Short circuit protection function of secondary rectifier tube

• VDD overvoltage protection function

• Under voltage lockout protection function (UVLO)

• No audio noise

Application:

• Switching ACDC power supply

• Laptop adapter

• PC peripheral power supply equipment

• Intelligent small household appliances