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