The SSC9500 is a quasi-resonant controller IC manufactured by Sanken Electric. It is designed for power factor correction (PFC) and DC-DC converter applications, offering high efficiency and low noise operation. This IC integrates various protection features and control functionalities to ensure stable and reliable power supply operation.

Applications:

• Power supplies for LCD TVs
• Power supplies for PDP TVs
• Power supplies for LED lighting
• AC-DC adapters
• DC-DC converters in various industrial and consumer applications

Features:

• Quasi-Resonant Operation: Reduces switching losses and EMI noise.
• Integrated PFC Control: Simplifies design and improves power factor.
• Burst Mode Operation: Enhances efficiency at light loads.
• Soft-Start Function: Minimizes stress on components during startup.
• Overcurrent Protection (OCP): Protects against excessive current draw.
• Overvoltage Protection (OVP): Prevents damage from voltage surges.
• Undervoltage Lockout (UVLO): Ensures proper operation at the correct voltage levels.
• Overload Protection (OLP): Shuts down the IC in case of overload.
• Thermal Shutdown (TSD): Protects the IC from overheating.

Benefits:

• High Efficiency: Reduces energy consumption and heat dissipation.
• Low EMI Noise: Minimizes interference with other electronic devices.
• Reliable Operation: Integrated protection features ensure stable performance.
• Simplified Design: Integrated control functions reduce external component count.
• Cost-Effective Solution: Offers a balance of performance and cost.

Additional Details:

The SSC9500 operates using a quasi-resonant control method, which minimizes switching losses by turning on the MOSFET when the voltage across it is at a minimum. This results in higher efficiency and lower EMI noise compared to conventional PWM control. The integrated PFC control circuit helps to improve the power factor, reducing harmonic distortion and improving overall power quality. The IC also incorporates a burst mode operation, which reduces power consumption at light loads by skipping switching cycles. This feature is particularly useful in standby power applications.

The SSC9500 is typically available in an 18-pin DIP or SOP package. It requires external components such as a MOSFET, rectifier diode, and passive components to form a complete power supply circuit. The specific values of these components will depend on the desired output voltage, current, and other operating parameters.

Technical Specifications (Typical):

• Operating Voltage: 8.9V to 25V
• Switching Frequency: Typically around 100kHz (depends on application)
• Operating Temperature: -20°C to +115°C