Voltage Regulator: Low Voltage Applications in Circuits

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Discussion Overview

The discussion centers around the use of voltage regulators versus voltage dividers for obtaining lower voltages in low voltage applications within circuits. Participants explore the advantages and characteristics of each method, particularly in terms of output stability and current handling.

Discussion Character

  • Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions the necessity of using a voltage regulator instead of a voltage divider for low voltage applications.
  • Another participant explains that the output of a voltage regulator is independent of its input voltage, which maintains a constant output, unlike a voltage divider whose output varies with input voltage changes.
  • A third participant notes the importance of ensuring that the current drawn by the application does not exceed the capacity of the voltage divider, and mentions specific examples of fixed and adjustable voltage regulators.
  • A later reply summarizes that voltage regulators provide a fixed output voltage that remains stable despite variations in input voltage and output current, as long as the conditions specified in the datasheet are met.

Areas of Agreement / Disagreement

Participants appear to agree on the advantages of voltage regulators over voltage dividers in terms of output stability, but there is no consensus on the necessity of using one method over the other in all low voltage applications.

Contextual Notes

Limitations include the dependence on specific application requirements, such as current demands and input voltage variations, which may affect the choice between a voltage regulator and a voltage divider.

ACLerok
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This may be a dumb question but I guess it won't hurt to ask. Is there a reason to use a voltage regulator to obtain a lower voltage from a certain set power supply voltage over using a voltage divider? I guess I'm talking low voltage applications in circuits not high power electronics.
 
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the output of a voltage regulator is "independente" of its input, thus keeping the voltage constant for any input, on the other hand the voltage divider will change its output once the input voltage changes.
 
if using a voltage divider, make sure that your application current is NOT higher than that of the voltage divider. some devices are fixed voltage regulators, others are adjustable voltage regulators. for example, 7805 is fixed 5V regultor, LT1074 is adjustable voltage regulator from which we can bias to have our desire output voltages.
 
So to summarize, the voltage regulator holds a fixed output voltage, independent of Vin variations, and independent of Iout variations (within datasheet specifications for the regulator, of course).
 

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