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MC34063A: Calculation Inductor and capacitors (MC34063ADR)

Part Number: MC34063A

Tool/software:

Hello,

When I try to calculate inductor value, I can not find Vsat. External capacitor is not used.

Please can you explain about Vsat.

What is the frequency value of step up referance design on datasheet ?

may I calculate switching frequency using Ct and Rsc? does it vary depending on input voltage?

And another tricks point which a needed?

I am trying design two circuit.

1_>> Vin: 8-35 VDC, Vout:37 VDC, L<=100uH >> f=?, Co=?, Rsc=?, Ct=?, L=? (frequency should be as small as possible)

2_>> Vin: 8-35 VDC, Vout:6 VDC, L<=100uH >> f=?, Co=?, Rsc=?, Ct=?, L=? (frequency should be as small as possible)

İf Vin varies between 8 and 35 volt, how can I choose the correct values.?

Best regards.

  • Hello zabbza,

    Please go to chapter 7.6 for VSAT. With this information, I think you can calculate the other values.

    For a boost converter, the worst case is when VIN is low. So I would calculate the values for the low input voltage and then check them with the high input voltage.

    Best regards,
    Brigitte