The SD6834 is a power switch IC manufactured by Silan Microelectronics, typically used in offline flyback converter applications. It integrates a power MOSFET and a controller, designed to create efficient and cost-effective power supplies.

Applications:

• Adapters for mobile phones and other portable devices
• Standby power supplies for TVs and set-top boxes
• Open-frame power supplies
• LED lighting power supplies
• Auxiliary power supplies

Features:

• Integrated high-voltage power MOSFET
• Current-mode PWM control
• Low startup current
• Low standby power consumption
• Overcurrent protection (OCP)
• Overvoltage protection (OVP)
• Overtemperature protection (OTP)
• Short circuit protection (SCP)
• Frequency jittering for improved EMI performance
• Soft start function

Benefits:

• Simplified Design: The integration of the MOSFET and controller reduces the number of external components needed, making the design process easier and faster.
• Cost-Effective: By reducing the BOM and simplifying the design, the SD6834 helps to lower the overall cost of the power supply.
• High Efficiency: Current-mode PWM control and other features optimize efficiency, reducing energy consumption and heat dissipation.
• Enhanced Reliability: The protection features (OCP, OVP, OTP, SCP) ensure reliable operation and protect the power supply from damage.
• Low Standby Power: The SD6834 is designed for low standby power consumption, meeting energy efficiency requirements.

The SD6834 typically operates in discontinuous conduction mode (DCM) or quasi-resonant mode (QR) to further enhance efficiency. The built-in frequency jittering feature helps to reduce EMI emissions, making it easier to meet regulatory requirements. The soft-start function minimizes stress on the power components during startup.

Typical Technical Specifications:

• Operating Voltage: 85VAC to 265VAC
• Switching Frequency: Typically around 65 kHz
• Standby Power: <0.3W
• Protection Features: OCP, OVP, OTP, SCP
• Package: DIP-8, SOP-8