UC1823A, UC2823A, UC2823B, UC3823A, UC3823B UC1825.
Texas Instruments
UC3825B - HIGH-SPEED PWM CONTROLLER
UC1823A, UC2823A, UC2823B, UC3823A, UC3823B UC1825A, UC2825A, UC2825B, UC3825A, UC3825B SLUS334F – AUGUST 1995 – REVISED AUGUST 2022 High-Speed PWM Co.