How to choose a 5V2.4A charger chip combination? What chip is used for a 12W low-power charger?

The efficient 12W low-power 5V2.4A charger scheme adopts an excellent combination of CX7502B and CX7537B, making it easy to develop, reliable, and cost-effective low-power power supply schemes. We recommend free demo board testing and scheme development technical support!

CX7502X series product is a high-performance multi-mode primary control switching power supply chip with built-in high-voltage BJT power switch transistor. This product designs high-performance AC/DC conversion switching power supplies with fewer peripheral components and lower system costs.

CX7502X series products 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.

CX7502X series products 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. This chip can achieve good output voltage regulation and high average efficiency, as well as standby power consumption of less than 75mW.

Features:

• 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 constant 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

Demo of 5V2.4A Level 6 Energy Efficiency Charger Scheme:

The synchronous rectification adopts the CX7537AX, which is a high-performance secondary side synchronous rectification chip integrated with synchronous rectification MOS, suitable for isolated synchronous rectification applications, especially suitable for situations where high efficiency is required in chargers.

CX7537AX adopts the technology of primary side open detection and secondary side intermittent detection, which can effectively avoid driver chip misoperation caused by excitation oscillation.

CX7537AX integrates VCC undervoltage protection, overvoltage clamping, and driver foot anti-interference technologies Improve the conversion efficiency of the system.

The small volume 5V2.4A six level energy efficiency power charger scheme adopts the CX7502B+CX7537B combination of six level energy efficiency power charger scheme, which is very exquisite and compact, and is very suitable for the application of simple and small volume products.