? Semiconductor Components Industries, LLC, 2002 September, 2002 – Rev. 1 1 Publication Order Number: AN983/D AN983/D A Simplified Power Supply Design Using the TL494 Control Circuit Prepared by: Jade H. Alberkrack ON Semiconductor Bipolar IC Division This bulletin describes the operation and characteristics of the TL494 SWITCHMODE t Voltage Regulator and shows its application in a 400 –watt off