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How does a low voltage regulator work?
A voltage regulator generates a fixed output voltage of a preset magnitude that remains constant regardless of changes to its input voltage or load conditions. It compares the output voltage with a precise reference voltage and adjusts the pass device to maintain a constant output voltage.
On what basis is the regulator selected?
To select a voltage regulator for your system, start by assuming a linear regulator can be used if the input voltage is higher than the output. Only if that wastes too much power, then use a buck switching regulator. If you need an output voltage higher than the input, then use a boost switching regulator.
Is there a minimum input voltage for a voltage regulator?
I have a L78S05V voltage regulator (5V output). The datasheet’s maximum ratings suggest the maximum input voltage (35V). I would like to know, is there a minimum input voltage? I have a circuit that is powered from a 5V power supply.
Why do linear regulators not work with the same voltage?
On a linear regulator you can not work with the same voltage at input and output. Basically inside the component there are transitors that are not perfect transistors, because they have a resistance when the current flow through them, and this resistance leads to a loss of voltage in the component. It is called the drop out voltage.
How is the voltage differential of a voltage regulator calculated?
As can be seen in equation 1, if you have a large voltage differential (Vin – Vout) across the regulator, and/or a high load current, then your regulator will dissipate high amounts of power. For instance, if the input is 12 V and the output is 3.3 V, the voltage differential would be calculated as 12 V – 3.3 V = 8.7 V.
Can a switching regulator be used to step up a voltage?
Switching regulators can be used to both step-down or step-up a voltage. If you require an output voltage that is less than the input voltage, start by looking at a linear regulator not a switching regulator. Figure 1 – A linear regulator uses a transistor and a feedback control loop to regulate the output voltage.