This post explains for the controller. A current mode PWM+PFM controller is a type of integrated circuit (IC) or controller chip used in power supply and voltage regulator circuits to efficiently regulate the output voltage while dynamically switching between Pulse-Width Modulation (PWM) and Pulse Frequency Modulation (PFM) control modes. This combination of control techniques allows for high efficiency over a wide range of load conditions, making it suitable for battery-powered and energy-efficient applications.
The Part Number is SD6864, SD6864P65K67.
The function of this semiconductor is Current Mode PWM+PFM Controller.
The package is SOP 8 Pin Type
Manufacturer: SILAN MICROELECTRONICS
Preview images :
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Description
The SD6864 is current mode PWM+PFM controller with built-in highvoltage MOSFET used for SWPS, with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation. The switch frequency is 25~67KHz with jitter frequency for low EMI. Built-in peak current compensation circuit makes the limit output power stable even with different input AC voltage.
Limit output power can be adjusted through the resistor. Maximum peak current compensation during power-on reduces pressure on transformer to avoid saturation, the peak current compensation will decrease for balance after power-on. It integrates various protections such as undervoltage lockout, overvoltage protection, overload protection, lead edge blanking, primary winding overcurrent protection and thermal shutdown. […]
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Features
1. Energy Star 2.0 standard
2. Lower start-up current (3mA)
3. Various switching frequency following load for the higher efficiency
4. Frequency jitter for low EMI
5. Overvoltage, overcurrent, overload and over temperature protections.
6. Adjustable limit output power
7. Undervoltage lockout
8. Built-in high voltage MOSFET
SD6864 PDF Datasheet
