onsemi DC DC Switching Controllers UC3843ADR2

The UC3843ADR2 is a high-performance current mode controller designed for off-line and DC-to-DC converter applications. It operates at a fixed frequency and features a trimmed oscillator for precise duty cycle control, making it suitable for applications requiring accurate voltage regulation. The device includes a temperature-compensated reference, a high-gain error amplifier, and a current sensing comparator, which enhance its performance in various power management scenarios. This controller supports automatic feed-forward compensation and includes protective features such as undervoltage lockout with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime. The UC3843ADR2 is packaged in a 14-pin SOIC format, which allows for efficient integration into compact designs. It is tailored for lower voltage applications with undervoltage lockout thresholds of 8.5 V (on) and 7.6 V (off). The device is also characterized by low startup and operating current, making it an energy-efficient choice for power management solutions.