Calculating MC7805 parameters using datasheet

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In summary, the conversation discusses determining Line Regulation and Load Regulation based on a datasheet and using test circuit parameters. The formulas for both regulations are mentioned, and there is a question about the values needed for the calculations. The datasheet provides the necessary data to calculate the regulations over a narrow and wide range.
  • #1
peripatein
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Hi,
I am asked to determine the Line Regulation and Load Regulation based on the attached datasheet, using the test circuit parameters listed there.

Homework Statement

Homework Equations

The Attempt at a Solution


Line Regulation is defined as ΔVo/ΔVI whereas Load Regulation is defined thus ΔVL/ΔIL, unless I'm mistaken. The datasheet lists VI but what are the values of the various voltage differences required to complete the calculation? Also, what are the values of VL and IL? Are they the values of Vo and Io, respectively?
 

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  • #2
I'd interpret this to be the data you need. You can determine typical regulation, and worst case, over a narrow range and a wide range.

reg.png
 
  • #3
I understand how to extract the line regulation and load regulation from the table, but my question was different. I'd like to use the test parameters in the datasheet attached to calculate them (probably using the formulae listed in #1 above). How should THAT be carried out?
 

1. What is the purpose of calculating MC7805 parameters using datasheet?

The MC7805 is a voltage regulator that is commonly used in electronic circuits. By calculating its parameters using the datasheet, one can determine the specific characteristics and limitations of the component, which is essential for proper circuit design and troubleshooting.

2. What are the important parameters to consider when calculating MC7805 parameters using datasheet?

The most important parameters to consider are the input and output voltage, maximum current rating, thermal resistance, and ripple rejection. These parameters will determine the performance and stability of the MC7805 in a circuit.

3. How do I calculate the input and output voltage for the MC7805?

The input voltage is typically the unregulated voltage from a power source, while the output voltage is the regulated voltage that the MC7805 will provide. These can be calculated by taking into account the voltage drop across the regulator, which is usually around 2 volts for the MC7805.

4. What is the maximum current rating for the MC7805?

The maximum current rating for the MC7805 is 1 ampere. This means that the component can handle a maximum continuous current of 1 ampere without overheating or failing.

5. How do I determine the thermal resistance of the MC7805?

The thermal resistance of the MC7805 can be found in the datasheet and is typically measured in degrees Celsius per watt (°C/W). It is important to consider this parameter when designing a circuit to ensure that the regulator does not overheat and cause damage to the component or the circuit.

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