Shenzhen CXW Technology., Co Ltd
15 years of experience
Summary:
CX1342 is a highly integrated quasi resonant flyback controller chip suitable for designing high-performance offline flyback switching power supplies, with an internal integrated high-voltage starting circuit; It can reduce the no-load power consumption to less than 30mW.
CX1342 has comprehensive protection functions, such as OPP (Overpower Protection), OVP (Overvoltage Protection), OSCP (Output Short Circuit Protection), AC network power failure protection, and primary abnormal overcurrent fault protection, which can prevent circuit damage in various abnormal situations and improve the safety of the CX1342 controller.
CX1342 has a frequency jitter function, which can effectively improve electromagnetic interference. When in light load, it limits the minimum operating frequency and enters the skip cycle operating mode, which can avoid audio noise during light load. The chip adopts SOP-9 packaging, which saves PCB space and is the preferred solution for low-power, low-cost, and high-efficiency projects.
Characteristic:
Abnormal overcurrent fault protection for winding short circuit or saturation detection
Bottom switch, bottom locked, no noise working mode
Built-in high-voltage starting circuit and power failure detection
Integrated X2 capacitor discharge function within the high-voltage start pin
Built-in 4 millisecond soft start time
The maximum switching frequency can be adjusted, up to 500KHz
With OTP fault detection pin
VCC working range from 9V to 28V
VCC over 28V triggers overvoltage protection
The minimum frequency clamp is a frequency turnback mode of 25 kHz, improving light load efficiency
Light load skip cycle mode without audio noise
MPCM mode for quickly reducing switch frequency under light load
Adjustable Overpower Protection (OPP)
Internal integrated over temperature protection
No load power consumption less than 30mW
Dithering function can reduce EMI
SOP-9 encapsulation
Application:
AC-DC adapter and charger
flyback switch power supply
CX7539F is a high-performance synchronous rectification control circuit for the secondary side of switching power supply. In the application of low-voltage and high-current switching power supply, it can easily meet the energy efficiency of class 6, and is an ideal solution for ultra-low conduction voltage drop rectifier devices. The chip can support switching frequency applications as high as 150kHz, as well as switching power mode applications such as CCM/QR/DCM. The loss caused by its extremely low turn-on voltage drop is far less than the turn-on loss of Schottky diode, which greatly improves the conversion efficiency of the system and greatly reduces the temperature of the rectifier device.<br/><br/>CX7539F is a synchronous rectifier switch with built-in high voltage NMOSFET, and it has extremely low internal resistance, which can provide the application output of the system up to 5 years. IC determines the switching state of integrated MOSFET by detecting its source-drain voltage, which is compatible with flyback converters in continuous mode, discontinuous mode and quasi-resonant mode.<br/><br/>CX7539F adopts special self-power supply technology, which can ensure that the chip will not work under voltage in both constant current and constant voltage working states of the primary control system.
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'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.
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