As the screen of the mobile phone grows larger, the performance of the processor becomes stronger and more multi-core is upgraded. In order to ensure the battery life, the battery capacity of the mobile phone also becomes large, which causes the charging time to inevitably become longer. How to shorten the charging time has become a major bottleneck for mobile applications. Successive charging solutions based on different vendors have emerged to improve charging efficiency in a short period of time. Click to learn >> Car multi-function fast charger program , compatible with all Android fast charge mobile phone models.
1. Block diagram
Graphical On Semi block diagram
2. Program features
· Reduce standby power consumption by frequency reverse and skip cycle modes
· Low power shutdown mode can be triggered by optocoupler
· Lossless overpower compensation
· Timer-based over power protection
· Output short circuit protection
· Dynamic self-powered high voltage start
· Undervoltage monitoring function
· Active X2 capacitor discharge
· Latch when severe faults occur
· Over-current protection for automatic recovery or latch selection
· No-load standby energy consumption < 30 mW
· Adjustable power overload protection
3. The main chip of this solution:
The NCP1247 is a new fixed frequency current mode PWM controller with dynamic self-powering.
NCP1247 application example block diagram 
NCP1247 internal structure block diagram
Details: NCP1247: Fixed Frequency Current Mode Controller for Flyback Converters
The NCP4303A/B is a full-featured controller and driver suitable for switching power supply circuits for simultaneous rectification.
NCP4303 application example block diagram 
NCP4303 internal structure block diagram
Details: NCP4303: Switching Power Supply Universal Synchronous Rectifier Driver
4.On Semi program photo
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