Shenzhen CXW Technology., Co Ltd
15 years of experience
Overview
The CX72GDXXS series is a high-performance quasi-resonant, high-precision constant voltage (CV) and
constant current (CC) output primary-side power supply IC with an integrated high-voltage power GaN transistor. This product enables the design of high-performance AC-DC switching power supplies with few external
components and low system cost.
The CX72GDXXS series provides a comprehensive set of intelligent protection features, including cycle-by-cycle overcurrent protection, soft-start, chip over-temperature protection, output overvoltage protection, VDD
undervoltage lockout protection, and VDD overvoltage lockout protection.
The CX72GDXXS series delivers precise constant voltage and constant current (CV/CC) output without the need for an optocoupler, secondary-side control circuit, or loop compensation circuit, while maintaining good stability. It offers excellent output voltage regulation capability, high average efficiency, and standby power consumption less than 75mW.
The CX72GDXXS series features a built-in output cable drop compensation function, which can be adjusted by
changing the FB resistor divider values. The unique PWM/PFM operating mode minimizes audio energy, ensuring no audible noise across the entire load range.
The CX72GDXXS series provides an excellent design platform for high cost-effectiveness flyback switching
power supply systems with ultra-low standby power consumption, meeting Level 6 energy efficiency and Eur2.0 standby power requirements.
Features
● Integrated high-voltage D-GaN power switch
● High-efficiency quasi-resonant operating mode
● Multi-mode primary-side control method
● Primary-side feedback control eliminates need for optocoupler and TL431
● Optimized dynamic response
● Standby power consumption <75mW
● ±5% constant current and constant voltage accuracy
● Adjustable cable drop compensation
● Built-in line voltage and primary winding inductance compensation
● Built-in adaptive peak current regulation
● Output short-circuit protection
● Noise-free operation
● Built-in leading-edge blanking (LEB) function
● Cycle-by-cycle current limiting (OCP)
● Output diode short-circuit protection
● Undervoltage lockout (UVLO), overvoltage protection (OVP), VDD voltage clamp protection
Applications
● Chargers
● PDA, digital camera, camcorder power adapters
● 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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