UC3843 Current Mode PWM Controller 8 Pin IC SMD SOP 8 Package

UC3843 Current Mode PWM Controller 8 Pin IC SMD SOP 8 Package 

The UC3843 is a current-mode pulse-width modulation (PWM) controller IC designed for use in switch-mode power supplies (SMPS) and DC-DC converter applications. It integrates essential control functions such as a precision oscillator, error amplifier, current sense comparator, and output driver into a compact 8-pin SOP (SMD) package, enabling efficient power conversion with a minimal external component count.

This controller operates at a fixed frequency and uses current-mode control to improve converter stability, simplify compensation, and provide fast response to load changes. The UC3843 is especially suited for offline and isolated power supply designs where reliable, stable regulation and current limiting are critical.

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Features

• Current-Mode PWM Control — Enhances stability and dynamic response
• Fixed Frequency Operation — Simplifies design and reduces EMI
• Precision Internal Oscillator — Minimal external components required
• High-Gain Error Amplifier — Accurate voltage regulation
• Current Sense Comparator — Provides cycle-by-cycle current limiting
• High-Current Output Driver — Capable of driving power MOSFETs
• Undervoltage Lockout (UVLO) — Prevents erratic operation at low supply voltage
• Low Start-Up and Operating Current — Suitable for energy-efficient designs
• SMD SOP-8 Package — Compact surface-mount form factor for PCB space-saving

Applications

• Switch-Mode Power Supplies (SMPS) — Flyback, forward, buck, boost converters
• Offline / Isolated Power Supplies
• DC-DC Converters for embedded systems
• Battery Chargers and Power Adapters
• Industrial Power Electronics
• LED Drivers and Lighting Supplies
• Telecommunications Power Systems
• Consumer Electronics Power Modules

uc3843-ic-datasheet