UC3843 - SMD / SMT SMD-8 Current Mode PWM Controller

UC3843 SMD-8 Current Mode PWM Controller for High-Performance Power Supplies

The UC3843 is a high-performance current-mode PWM controller. It is specifically designed for off-line and DC-DC converter applications. Housed in a compact SMD-8 (SOIC-8) package, it supports high-density PCB assembly. This controller offers fast response and high efficiency. It provides precise regulation for stable power output. The UC3843 is ideal for switch-mode power supplies (SMPS) and LED drivers. It also excels in isolated power conversion systems. Its current-mode control ensures superior line and load regulation. Additionally, it features inherent cycle-by-cycle current limiting for robust operation.

Specifications:

• Function: Current Mode PWM Controller
• Package Type: SMD-8 / SOIC-8 (Surface-Mount)
• Operating Voltage Range: 8.5V to 30V
• Output Voltage Swing: 0V to ~VCC
• Oscillator Frequency: Up to 500 kHz
• Start-Up Current: < 1 mA
• Operating Supply Current: ~11 mA
• UVLO Threshold: Turn-on: ~8.5V, Turn-off: ~7.6V
• Reference Voltage: 5V ±1% (Precision internal reference)
• Output Drive Current: ±1A (typical)
• RoHS Compliant: Yes

Key features and benefits:

• High-performance current-mode control for superior line and load regulation.
• Integrated cycle-by-cycle current limiting for enhanced protection.
• Supports high-speed operation with oscillator frequencies up to 500 kHz.
• Features Undervoltage Lockout (UVLO) for safe and reliable power-up.
• Delivers fast transient response, ideal for dynamic load conditions.
• Compact SMD-8 (SOIC-8) surface-mount package for high-density designs.

Applications:

• Off-line Switch-Mode Power Supplies (SMPS)
• DC-DC Converters
• LED Drivers
• Battery Chargers
• Industrial Control Power Modules

Package Includes:

*Image shown is a representation only.

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