UC3844D

The UC3844D from Motorola Semiconductor is a high-performance, fixed-frequency, current-mode PWM controller. It is engineered for Off-Line and DC to DC converter applications, requiring minimal external components for operation. Key features include a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output suitable for driving Power MOSFETs.

This controller operates with a supply voltage of up to 30V and can handle an output current of ±1A. It offers UVLO thresholds of 16V (on) and 10V (off), making it ideal for off-line converters. The UC3844D supports operation with a 50% duty cycle and includes features like cycle-by-cycle current limiting and adjustable output dead time.

Available in 8-DIP and 14-SOP packages, the UC3844D is designed for robust performance in demanding power supply designs. Its thermal characteristics include power dissipation ratings of 1200mW for 8-DIP and 460mW for 8-SOP at 25°C ambient temperature, with junction-to-ambient thermal resistance values of 100°C/W for 8-DIP and 265°C/W for 8-SOP.

The device operates within an ambient temperature range of 0°C to +70°C and has a storage temperature range of -65°C to +150°C. The UC3844D is a cost-effective solution for designers seeking reliable and efficient power management.