It is a switch mode power supply. Thus, it has high efficiencies of over 90%. In the circuit below, it uses the MC34063 and a few components. So we can build easily with cheap.
Use IC- MC34063 so easy circuit, Adjustable VR1 for Control Efficiency at 12V 600mA
Thus it can function as a step-up converter, a step-down converter. And the inverter with a combination of step-up or step-down function.
Often we found it on many devices such as car chargers for instance to regulated voltage levels.
Its output current capability up to 1.5A.
And it can switch power at frequencies up to 100KHz.
The datasheet for the MC34063 chip. We can see at the following link: MC34063 Switching Regulator Datasheet.
Working of Circuit
In the circuit above. This circuit uses a few components. We come to see it.
First of all, to power this chip with connecting +V to VCC pin 6, and the pin 4 to ground.
Next, this sets power for the chip. After that, the input voltage, to VCC and ground. At the same time, we connect a 100uF capacitor. It will filter an excess noise from the power supply out.
Then, Pin 2 connected to the base of internal transistors-Q1-TIP31 to ground.
Pin 3 is the timing capacitor-C2. It determines the switching speed of the circuit.
Pin 5 is inverting terminal of the comparator.
The voltage of noninverting terminal is 1.25V from the internal voltage regulator.
To the inverting terminal, we place a resistor network composed of 2 resistors. These decide the gain of the op-amp comparator by the formula, VOUT= 1.25V (1 + R4/R3).
Since we want an output voltage of 12V, R3= 1.5K and R4= 12K.
We use the potentiometer-VR1 to adjust the Efficiency at 12V 600mA
This is how the circuit has its boost functionality.
And this is a classic switch mode power supply using the MC34063 chip to act as a step-up or boost converter.
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