UC3842A Current-Mode PWM Controller – SOIC-8, 500kHz, 16V UVLO

The UC3842A is a high-performance current-mode PWM controller in an 8-pin SOIC package, specifically designed for efficient power conversion in off-line and DC-DC applications. It offers precise oscillator discharge control, optimized error amplifier, pulse-by-pulse current limiting, and enhanced dynamic load response. With a UVLO threshold of 16V (ON) and 10V (OFF), it ensures robust operation in demanding environments. The internal reference, low start-up current (<0.5 mA), and trimmed oscillator contribute to reliable and efficient operation in compact designs. This IC is widely used in switch-mode power supplies, power modules, and battery-operated PSUs.

 
 Key Features:

• Optimized for Off-Line and DC-DC Converter Applications.
• Startup Threshold: 16V ON, 10V OFF (UVLO).
• Low Start-Up Current: <0.5 mA for high-efficiency standby.
• Internal 1 MHz error amplifier with low impedance output.
• Pulse-by-Pulse Current Limiting and Soft-Start Functionality.
• Programmable Oscillator Frequency up to 500 kHz.