The SG6848DZI is a highly integrated PWM controller from Fairchild/ON Semiconductor designed for low power AC/DC adapter and charger applications. It incorporates a current mode PWM controller with advanced features to achieve high efficiency, low standby power, and comprehensive protection. This device simplifies the design of efficient and reliable power supplies for various consumer electronics.

Applications

• AC/DC Adapters for mobile phones
• AC/DC Adapters for digital cameras
• AC/DC Adapters for portable devices
• Low Power Chargers
• Standby Power Supplies

Features

• Current-Mode PWM Control: Provides excellent line and load regulation.
• Low Startup Current: Minimizes power consumption during startup.
• Frequency Hopping: Improves EMI performance by spreading the switching frequency.
• Over-Temperature Protection (OTP): Protects the device from overheating.
• Over-Voltage Protection (OVP): Prevents damage from excessive output voltage.
• Over-Current Protection (OCP): Limits the output current to protect the device and load.
• Under-Voltage Lockout (UVLO): Ensures proper operation during startup and prevents erratic behavior.
• Open-Loop Protection (OLP): Protects the power supply from damage in case of feedback loop failure.
• Soft-Start Function: Reduces stress on components during startup.
• Adjustable Switching Frequency: Allows optimization for efficiency or EMI.

Benefits

• High Efficiency: Optimized design for minimal power losses.
• Compact Design: Reduces board space requirements.
• Enhanced Reliability: Comprehensive protection features ensure robust operation.
• Simplified Design: Fewer external components required.
• Improved EMI Performance: Frequency hopping reduces electromagnetic interference.
• Cost-Effective Solution: Reduces overall system cost.
• Low Standby Power Consumption: Meets stringent energy efficiency standards.

Additional Details

The SG6848DZI operates with an adjustable switching frequency, typically in the range of 65kHz. It comes in a DIP or SOP package. Detailed specifications regarding voltage ranges, current limits, and switching frequencies are available in the device datasheet. It is specifically designed for low-power applications, making it ideal for chargers and adapters that need to meet stringent energy efficiency requirements, such as Energy Star and ErP Lot 7.