onsemi DC DC Switching Controllers UC3844N

The UC3844N is a fixed frequency current-mode PWM controller designed for off-line and DC to DC converter applications, requiring minimal external components. It operates with a maximum duty cycle of 50% and features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, and a high-gain error amplifier. The device has under-voltage lockout (UVLO) thresholds of 16V (on) and 10V (off), ensuring reliable operation. It supports an operating frequency of up to 500 kHz and can handle a supply voltage of up to 30V. The output current capability is ¬±1A, making it suitable for driving power MOSFETs. The UC3844N is available in multiple package types, including 8-DIP and 14-SOP, and operates within a temperature range of 0¬8C to +70¬8C. Its thermal resistance and power dissipation characteristics are also specified, ensuring effective thermal management in various applications.