Texas Instruments UC3854 High Power Factor Preregulator UC3854DWG4

The UC3854DWG4 is a high power factor preregulator designed by Texas Instruments, suitable for offline AC-to-DC converters and various power supply applications including medical, industrial, telecom, and uninterruptible power supplies. This device achieves a power factor of up to 0.99 and limits line current distortion to less than 5%. It operates effectively across a wide range of line voltages from 75V to 275V and frequencies from 50Hz to 400Hz. The UC3854 features average current-mode control, which ensures stable operation with low distortion and minimal noise sensitivity. It includes a fixed-frequency PWM drive, a precision voltage reference, and a totem-pole gate driver capable of handling power MOSFETs. The device also incorporates a low startup supply current, making it efficient for various applications. It is available in multiple package types, including a 16-pin SOIC, which is suitable for surface mount applications.