Linear Integrated Circuits: Unit V: Application ICs
Limitations of Linear Voltage Regulators
The regulators discussed uptill now are called as linear regulators because the series pass transistor used in such regulators operates in the linear region.
Limitations of Linear Voltage Regulators
The regulators discussed uptill now are called as linear regulators because the series pass transistor used in such regulators operates in the linear region. But such linear regulated power supplies have following limitations :
1) The required input step down transformer is bulky and expensive.
2) Due to low line frequency (50 Hz), large values of filter capacitors are required.
3) The efficiency is very low.
4) Input must be greater than the output voltage.
5) As large is the difference between input and output voltage, more is the power dissipation in the series pass transistor.
6) For higher input voltages, efficiency decreases.
7) The need for dual supply, is not economical and feasible to achieve with the help of linear regulators.
The switching regulators overcome all these limitations.
Review Question
1. State the limitations of linear voltage regulators.
May-08, Marks 8
Linear Integrated Circuits: Unit V: Application ICs : Tag: : - Limitations of Linear Voltage Regulators
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