DC/DC CONVERTER CONTROL CIRCUIT
MC34063
DC/DC CONVERTER CONTROL CIRCUIT
Description
The MC34063 is a monolithic control circuit containing the primary ...
Description
MC34063
DC/DC CONVERTER CONTROL CIRCUIT
Description
The MC34063 is a monolithic control circuit containing the primary functions required for DC/DC converters. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This device is specifically designed to be incorporated in stepdown, step-up and voltage-inverting applications with a minimum number of external components. The ±2% internal reference and low quiescent current of 1.6mA are among the improvements of the device over the competition
Features
3V to 30V Input Voltage Operation. Internal 1.2A Peak Current Switch. Internal ±2% Reference. Low Quiescent Current at 1.6mA. Frequency Operation from 100Hz to
100KHz. Low Dropout Operation: 100% Duty
Cycle Current Limiting. Standard SOP8/DIP8 Packages
Applications
DC-DC Converter Module ADSL Modems Hub. Battery Chargers
Functional Diagram
Ver1.0
1
Pin Description
Symbol Pin NO.
MC34063
Description
SC SE TC GND FB VCC IPK DRI
1 1.2A switch collector 2 Darlington switch emitter 3 Oscillator timing capacitor 4 Power GND 5 Feedback comparator inverting input 6 Power supply input 7 Highside current sense input, VCC - VIPK=300mV 8 Drive collector
Absolute Maximum Ratings
Supply Voltage ……………….……………………. ………………………………… ……40V Comparator Input Voltage Range ……………………….……..………………………-0.3V~40V Switch Collector Voltage …………………...
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