The SSC9527S is a power factor correction (PFC) and quasi-resonant current mode PWM controller IC manufactured by Sanken Electric. It integrates both PFC and PWM control functions into a single chip, designed for high-efficiency and low-noise power supply applications. The 'S' suffix often indicates a specific package or feature enhancement.

Applications:

• Power supplies for LCD TVs
• Power supplies for LED lighting
• AC-DC adapters for various electronic devices
• Industrial power supplies
• Server and telecom power supplies

Features:

• Integrated PFC and PWM Control: Simplifies design and reduces component count.
• Quasi-Resonant Operation: Reduces switching losses and EMI noise.
• Valley Switching: Further minimizes switching losses.
• Burst Mode Operation: Improves efficiency at light loads.
• Soft-Start Function: Reduces stress on components during startup.
• Overcurrent Protection (OCP): Protects against excessive current.
• Overvoltage Protection (OVP): Prevents damage from voltage surges.
• Undervoltage Lockout (UVLO): Ensures stable 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: Quasi-resonant operation and valley switching minimize switching losses.
• Low EMI Noise: Reduces interference with other electronic devices.
• Improved Power Factor: PFC control improves power quality and reduces harmonic distortion.
• Simplified Design: Integrated PFC and PWM control reduces external component count.
• Robust Protection: Integrated protection features ensure reliable and safe operation.

Additional Details:

The SSC9527S integrates both a power factor correction (PFC) controller and a quasi-resonant current mode PWM controller. This allows for a simpler and more compact power supply design. The quasi-resonant operation minimizes switching losses by switching at the valley of the voltage waveform. Valley switching further reduces switching losses. Burst mode operation improves efficiency at light loads by skipping switching cycles. The integrated protection features protect the IC and the power supply from various fault conditions.

External components, such as MOSFETs, diodes, inductors, and capacitors, are required to implement a complete power supply. The specific values of these components depend on the desired output voltage, current, and operating frequency. Refer to the manufacturer's datasheet for detailed design guidelines and component selection recommendations.

Technical Specifications (Typical):

• Operating Voltage Range: 8.9V to 25V
• Operating Frequency: Varies depending on application and external components
• Operating Temperature: -20°C to +115°C
• Package: DIP-18 or SOP-18