KA7521

KA7521 BALLAST CONTROLLER ELECTRONIC BALLAST CONTROLLER The KA7521 is a electronic ballast controller for fluorescent inverter system. It contains soft start, no lamp protection and over temperature protection. With the zero voltage switching, it can also provide low noise and low power loss. FEATURES Dimming Control 3 Step Soft start ZVS Driving DC feed-forward No Lamp Protection Over temperature protection with Variable Hysteresis Option Comparator Internal UVLO 16 DIP ORDERING INFORMATION Device KA7521 Package 16 DIP ÎOperating Temperature -25 ~ + 100 BLOCK DIAGRAM ©1999 Fairchild Semiconductor Corporation Rev. B KA7521 BALLAST CONTROLLER ABLOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Peak driver output current Zener diode current Operating ambient temperature Storage Temperature Symbol VCC IO(P) IJ(ZD) TOPR TSTG Value 17 500 200 - 25 ~ +100 - 65 ~ +150 Unit V mA mA Î Î ÎELECTRICAL CHARACTERISTICS (VCC = 10V, TA = 25 , unless otherwise specified) Characteristic Symbol Test conditions Min Typ Max Unit Under Voltage Lock Out Section Start Threshold Voltage UV Lockout Hysteresis Start-up Supply Current Operating Supply Current Reference Section VTH(ST) VTHS IST ICC VCC = 7V VCC = 12V, No Load 9.1 9.7 10.3 V 1.7 1.9 2.1 V 0.8 1.0 mA 5 9 mA Reference Voltage Load Regulation Preheating Section LVREF VREF  0 IREF 5mA 4.90 5 5.10 V 5 mV Preheating Frequency Preheating Time Current Preheating Dead Time Oscillator Section...