Professional IC Distribution & Technical Solutions

The part SG3843N is a PWM (Pulse Width Modulation) controller IC manufactured by SG Micro (SGMICRO). Below are its specifications, descriptions, and features based on available data:

Specifications:

• Manufacturer: SG Micro (SGMICRO)
• Type: Current Mode PWM Controller
• Topology: Flyback, Forward, Boost, Buck
• Input Voltage Range (VCC): 8.5V to 30V
• Operating Frequency: Adjustable up to 500kHz
• Output Duty Cycle: Up to 50% (for push-pull applications)
• Reference Voltage: 5V (±1%)
• Output Drive Current: ±200mA (peak)
• Start-up Current: <1mA
• Low Operating Current: ~11mA (typical)
• Error Amplifier Bandwidth: ~3MHz
• Protection Features: Under-Voltage Lockout (UVLO), Over-Current Protection (OCP)
• Package: 8-Pin DIP or SOIC

Descriptions:

The SG3843N is a high-performance PWM controller designed for DC-DC converter applications. It operates in current-mode control, providing improved loop response and simplified feedback compensation. It is commonly used in switching power supplies, battery chargers, and LED drivers.

Features:

• Precision 5V Reference for stable feedback control
• Adjustable Oscillator Frequency via external resistor/capacitor
• Current Sensing Comparator for cycle-by-cycle current limiting
• Soft-Start Capability for controlled startup
• Under-Voltage Lockout (UVLO) ensures proper operation
• Totem Pole Output for direct MOSFET/transistor drive
• Low Power Consumption for energy-efficient designs

This IC is a functional equivalent to the UC3843 and TL3843 series, making it compatible with many existing designs.

Would you like additional details on a specific parameter?