Column: Circuit drill


Monitored performance Te ratio between the output and the input voltages is shown in Figure 2. To ‘visualise’ their relationship, we plotted the readings – see the dashed line in Figure 2. Tis shows that the circuit does not deliver a linear output (in relation to the input voltage) when the input voltage is between 0Vdc and 3.8Vdc. In that range, the circuit output is 0.6Vdc lower than the input voltage. Magnifying the curve of Figure 2 shows


the exact shape of the circuit response; see Figure 3. We can safely conclude that the


reverse-voltage protection circuit can’t deliver linear output voltage (in relation to the applied input voltage) when the input voltage is between 0Vdc and 3.8Vdc, but it shows a perfect linear relation when the applied input voltage is above 3.8Vdc. Tese findings are very important for circuit designs, as it means that for an


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Figure 3: Magnified circuit response curve of the relationship between the input and output voltages


operating voltage between 0Vdc and 3.8Vdc it is not recommended to use reverse-polarity protection, since it will reduce the voltage passing through to


the protected circuit (the load) by about 0.6Vdc. Tat voltage range requires a more complex reverse-voltage protection circuit.


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