KA3842AM

Linear Integrated Circuit CURRENT−MODE PWM CONTROLLER The KA3842A KA3842AM are fixe frequency current-mode PWM controller. They are specially designed for OFF−Line and DC−to−DC converter applications with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuity includes built under−voltage lockout and current limiting. The KA3842A,KA3842AM have UVLO thresholds of 16 V(on) and 10 V (off). The KA3842A ,KA384AM can operate within 100% duty cycle The KA3842A has been proven in applications using the same external components as Motorola's parts,among others .The KA3842AM has been optimized for compatibility with Samsung's parts Many applications can use either The KA3842A KA3842AM have Start-Up Current 0,45 mA KA3842A or KA3842AM KA3842A KA3842AM PIN CONNECTION FEATURES Low Start-Up Current Maximum Duty Cycle U/V Lockout With Hysteresis Operating Freguency Up To 500khz SO-8 DIP-8 ordering information Device KA3842AM KA3842AMM KA3842AN KA3842AMN Package SO-8 SO-8 DIP-8 DIP-8 Operating temperature 0 to +700C " " " BLOCK DIAGRAM Absolute Maximum Ratings Characteristic Supply Voltage Output Current Analog Inputs Error Amp Output Sink Current Power Dissipation (TA=250C) Symbol VCC IO VI ISINK (E.A) PO Value 30 ±1 −0.3 to VCC 10...