Shenzhen CXW Technology., Co Ltd
15 years of experience
Overview
The CX72GDXXXH series is a high-performance quasi-resonant primary-side regulated power supply IC with high-precision constant voltage (CV) and constant current (CC) output, featuring a built-in high-voltage power GaN transistor. This product is designed for high-performance AC/DC switching power supplies with minimal external components and low system cost.
The CX72GDXXXH series provides comprehensive and high-performance intelligent protection features,
including cycle-by-cycle over-current protection, soft start, chip over-temperature protection, output over-voltage protection, VDD under-voltage lockout protection, and VDD over-voltage lockout protection.
The CX72GDXXXH series delivers accurate CV/CC output without the need for an optocoupler, secondary-side control circuitry, or loop compensation components, while maintaining excellent stability. It offers good output
voltage regulation, high average efficiency, and standby power consumption of less than 75mW.
The CX72GDXXXH series features built-in output line loss compensation, which can be adjusted by modifying the resistance value of the FB voltage divider resistors. The chip ’s unique PWM/PFM operating mode minimizes audio energy, ensuring no audible noise across the full load range.
The CX72GDXXXH series provides an excellent design platform for high cost-performance flyback switching power supply systems with ultra-low standby power consumption, meeting the requirements of Level VI energy efficiency and the European Energy Saving Standard Eur 2.0.
Features
● Integrated high-voltage D-GAN power switch
● High-efficiency quasi-resonant operation with multi-mode primary-side control
● Primary-side feedback control eliminates optocouplers and TL431
● Optimized dynamic response
● Standby power <75mW
● ±4% CC accuracy, ±2% CV accuracy
● Adjustable line loss compensation
● Built-in line voltage and primary winding inductance compensation
● Built-in adaptive peak current regulation
● Output short-circuit load protection
● No audible noise during operation
● Built-in leading edge blanking (LEB)
● Cycle-by-cycle over-current protection (OCP)
● Output diode short-circuit protection
● Under-voltage protection (UVLO), over-voltage protection (OVP), VDD voltage clamping protection
Applications
● Battery chargers
● Power adapters for PDAs, digital cameras, camcorders
● Set-top box power supplies
● Open-frame switching power supplies
● PC auxiliary power supplies
CX7538BS is a high-performance secondary side synchronous rectification control circuit for switch-mode power <br/><br/>supplies. It easily meets the Level VI energy efficiency requirements in low-voltage, high-current switch-mode power <br/><br/>supply applications, making it an ideal solution for ultra-low forward voltage drop rectification devices. It also supports <br/><br/>various operating modes of switch-mode power supplies, such as CCM, QR , and DCM . Its extremely low forward <br/><br/>voltage drop results in much less conduction loss compared to Schottky diodes, greatly improving the system&#039;s <br/><br/>conversion efficiency and significantly reducing the temperature of the rectification device.<br/><br/><br/><br/>The CX7538BS chip features an NMOSFET synchronous rectification switch with a built-in voltage tolerance of 60V <br/><br/>and an extremely low internal resistance, with a typical RdsON as low as 12mΩ, providing the system with an output <br/><br/>capability up to 4A. The chip determines its switching state by detecting the source-drain voltage of the built-in <br/><br/>MOSFET, making it compatible with flyback converters in continuous mode, discontinuous mode, and quasi-resonant <br/><br/>operation modes.
Overview
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