34063

34063 Description The MC34063A Series is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be www.datasheet4u.com incorporated in Step-Down and Step-Up and Voltage-Inverting applications with a minimum number of external components. Features Operation from 3.0 V to 40 V Input Low Standby Current Current Limiting Output Switch Current to 1.5 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference Plastic Package Pin Connections Internal Block Digram Driver Collector 1 S R Ipk Sense Ipk Oscillator Comparator 1.25 V Reference 4 Gnd CT 7 100 2 3 VCC Comparator Inverting Input 6 Switch Emitter Timing Capacitor Q Q2 Q1 8 Switch Collector 5 BEIJING ESTEK ELECTRONICS CO.,LTD 1 34063 Absolute Maximum Ratings Symbol VCC Power Supply Voltage VIR Comparator Input Voltage Range www.datasheet4u.com VC(switch) Switch Collector Voltage VE(switch) VCE(switch) VC(driver) IC(driver) ISW TJ TA Tstg Switch Emitter Voltage (V PIN1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Parameter Maximum 40 -0.3 to +40 40...