Shenzhen CXW Technology., Co Ltd
15 years of experience
Summary:
CX7502A is a high-performance multi-mode primary control switching power supply chip with built-in high-voltage BJT power switch transistor. The chip designs high-performance AC/DC conversion switching power supplies with fewer peripheral components and lower system costs.
CX7502A provide extremely comprehensive and high-performance intelligent protection functions, including cycle by cycle overcurrent protection, soft start, chip over temperature protection, output overvoltage protection, VDD undervoltage locking protection, and VDD overvoltage locking protection.
CX7502A provide precise constant voltage, constant current (CV/CC) output, without the need for optocouplers, secondary control circuits, and loop compensation circuits, while maintaining good stability. The chip can achieve good output voltage regulation and high average efficiency, as well as standby power consumption of less than 75mW.
CX7502A have output line loss compensation function, which can be adjusted by adjusting the Fb divider resistance value. In addition, the unique PWM/PFM working mode of the chip minimizes audio energy and eliminates audio noise throughout the entire load.
CX7502A provides a good design platform for cost-effective flyback switching power supply systems that require ultra-low standby power consumption, and is very suitable for applications that meet Level 6 energy efficiency and the European energy-saving standard Eur2.0
Characteristic:
Built-in high-voltage BJT power switch tube
Built-in output line loss voltage compensation
Built in original edge sensitivity compensation
High precision constant voltage and current output
Quasi resonant (QR) operating mode
Built in leading edge blanking function
Multi mode control (PWM+PFM)
Low starting current
VDD overvoltage protection,
VDD undervoltage locking function (UVLO)
Output overvoltage protection
Over temperature protection
Application:
Charger
Power adapter
Set-top box power supply
Auxiliary power supply
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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