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Buck / boost / inverting controller

MC34063A Basic Circuit

Build a basic MC34063A circuit with labeled pins, component values and connection guidance.

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MC34063A in a circuit

Physical PDIP-8 · 25 V input · resistor-set output.

MC34063A buck circuit with 0.33ohm sense resistor, 470pF timing capacitor, 220uH inductor,1N5819,100uF input,470uF output and 3.8k/1.2k divider.
Adapted from TI Figure 11. All equal supply labels and GND symbols share their named net. Check actual parts, layout, heat and startup.

Connect it, step by step

Follow the component values and pin connections

Supply and sense

Feed VCC6 before RSC, with SC1, IPK7 and DC8 after it.

Store and recover energy

SE2 feeds the inductor. The diode carries off-state current from ground.

Set the output

The R2/R1 junction drives INV5. The nominal divider predicts 5.208 V.

Component view