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.
1. Scheme block diagram
Fairchild program block diagram
2. Program features
· Output short circuit protection
· Milliwatt saving technology provides ultra-low standby power consumption, easily meeting the "Energy Star V5.0"
· During constant voltage control, according to the input voltage, there are two fixed PWM operating frequencies of 140kHz/85kHz.
· High voltage start
· Constant current control in intermittent and continuous operation modes without secondary feedback circuit
· High power density and conversion efficiency in continuous operation mode
· FM to reduce EMI noise
3. The main components of this solution:
FAN501 − Offline DCM/CCM Flyback PWM Controller for Charger Applications
This advanced PWM controller, the FAN501, simplifies the design of isolated power supplies that require constant current regulation of the output. The information of the primary side of the transformer is used and controlled by an internal compensation circuit to remove the output current detection loss and eliminate the external CC control circuit to accurately estimate the output current. Intermittent mode with extremely low operating current (250 μA) maximizes light load efficiency and therefore meets worldwide guidelines for standby mode efficiency.
Product Features
1) WSaver® technology delivers Energy Star 5 star (30 mW) ultra low standby power
2) Constant current (CC) control without secondary side feedback circuit in discontinuous conduction mode (DCM) and continuous conduction mode (CCM)
3) Dual frequency function changes switching frequency (140 kHz/85 kHz) according to input voltage, maximizing transformer utilization and improving efficiency
4) High power density and conversion efficiency in CCM mode operation in a typical 10 W to 15 W compact charger application
5) Frequency hopping reduces EMI noise
6) High voltage start
7) Constant current regulation by external resistor adjustment to accurately limit the maximum output power
8) Peak current mode control by slope compensation to avoid subharmonic oscillation
9) Programmable overtemperature protection in latch mode with external NTC resistors
10) VS overvoltage protection (in latch mode), VS undervoltage protection (self-restart mode), VDD overvoltage protection (self-restart mode)
11) In MLP 4X3 package
FAN501 application block diagram 
FAN501 functional block diagram
Details: FAN501 − Offline DCM/CCM Flyback PWM Controller for charger applications
4.Fairchild program photo
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