MC34063A Product Introduction

MC34063A is a single-chip bipolar linear integrated circuit. The following is a detailed introduction to it:

1、 Basic characteristics
Multi functional: MC34063A can achieve boost and buck effects, and is a DC-DC converter chip with boost, buck, and reverse phase functions.
Packaging form: Plastic sealed dual row 8-lead direct insertion, also available in SOIC (Small Outline Integrated Circuit) or SO-8 packaging forms.
Input voltage range: Wide range input, typically 3V to 40V.
Output current: High current output, up to 1.5A without external transistor.
Working frequency: The working oscillation frequency ranges from 100Hz to 100kHz.
Output voltage: The output voltage is adjustable.
2、 Internal composition
The internal circuit of MC34063A includes components such as reference voltage source, oscillator, converter, logic control circuit, and switching transistor. Among them, the reference voltage source is a temperature compensated bandgap reference source, and the oscillation frequency of the oscillator is determined by the external timing capacitor of pin 3. The switching transistor is set to ON by the reverse input terminal of the comparator and the logic control circuit connected to the oscillator, and is set to OFF by the next pulse synchronized with the output of the oscillator.

3、 Main features
Low cost: MC34063A adopts a relatively simple design, making it relatively low-cost and suitable for use in cost sensitive applications.
High efficiency: With high energy conversion efficiency, it can maximize energy utilization and reduce power consumption.
Over temperature and over-current protection: Built in over temperature and over-current protection mechanisms can effectively protect chips and external circuits.
Minimizing external components: DC-DC conversion function can be achieved with a small number of external components, simplifying design and layout.
4、 Application scope
MC34063A is widely used in various electronic devices and circuits, such as power management, LED drivers, battery chargers, etc. The specific circuit design and application methods may vary according to specific needs.

5、 Pin function
The pin functions of MC34063A typically include:

Pin 1: collector terminal of switch tube T1.
2-pin: emitter terminal of switch tube T1.
3-pin: timed capacitor CT terminal, adjusting CT can change the operating frequency within the range of 100Hz to 100kHz.
4 pins: power ground.
5-pin: The inverting input terminal of the voltage comparator is also the output voltage sampling terminal. When in use, two precision resistors with an accuracy of not less than 1% should be externally connected.
6-pin: power terminal.
7-pin: Load peak current (Ipk) sampling terminal. When the voltage between pins 6 and 7 exceeds 300mV, the chip will activate the internal overcurrent protection function.
Pin 8: Driver tube T2 collector terminal.
In summary, MC34063A is a powerful, low-cost, and efficient DC-DC converter chip suitable for various electronic devices that require voltage conversion and power management.