The SG6859TZ is a highly integrated PWM controller tailored for high-performance, low standby power offline flyback converter applications. This controller incorporates multiple protection features and functions to enhance system reliability and safety, making it suitable for a wide range of power supply designs.

Applications

• AC/DC adapters for various electronic devices (e.g., smartphones, tablets, power tools)
• Offline battery chargers
• Standby power supplies for televisions, set-top boxes, and DVD players
• LED lighting power supplies

Features

• Low startup current
• Low operating current
• Current-mode PWM control
• Leading-edge blanking
• Programmable switching frequency
• Internal slope compensation
• Cycle-by-cycle current limiting
• Over-voltage protection (OVP)
• Overload protection (OLP)
• Short-circuit protection (SCP)
• Over-temperature protection (OTP)
• Built-in soft start
• Frequency shuffling for improved EMI performance

Benefits

• Reduced standby power consumption, enabling compliance with stringent energy efficiency standards (e.g., Energy Star).
• Enhanced system reliability and robustness due to the integrated protection features.
• Simplified circuit design, reducing the number of external components required.
• Improved electromagnetic interference (EMI) performance through frequency shuffling.
• Minimized stress on power components during startup with the soft-start function.

Additional Details

The SG6859TZ offers a switching frequency around 65kHz and operates with a current-mode PWM control architecture, which provides excellent line and load regulation. The device includes a built-in soft-start feature which serves to minimize the stress on the power components during the startup phase. This controller is available in a compact package, making it ideal for applications with stringent space constraints. The datasheet from ON Semiconductor contains more detailed electrical characteristics, including voltage ranges, current limits, and timing specifications. The device's efficiency and protection mechanisms make it a reliable choice for modern power supply designs.