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