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Foldback Current Limiting Circuit

Foldback Current Limiting Circuit

Foldback Current Limiting Circuit: The disadvantage of constant current limit is relatively large power dissipation in the series pass transistor when the load terminals are shorted. Thus a large power rating transistor is required. The Foldback Current Limiting technique allows us to provide the necessary load current at rated voltage but reducing the short circuit

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Constant Current Limiting Circuit

Constant Current Limiting Circuit

Constant Current Limiting Circuit: A block of series regulation using simple Constant Current Limiting Circuit is shown in the Fig. 2.119. It is also called short circuit protection circuit as it provides protection against short circuiting. The resistance R4 is added in series with the pass transistor Q1 and the load which is called current sensing

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Protection Circuits in Regulators

Protection Circuits in Regulators: Protection Circuits in Regulators- The series regulator using transistors has no short circuit protection. If the load terminals are shorted accidentally then, Large amount of load current will flow. The pass transistor Q1 will get destroyed. The diodes used in unregulated power supply, supplying the input voltage Vin to regulator circuit

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Negative Voltage Regulator

Negative Voltage Regulator

Negative Voltage Regulator: Connections for getting negative voltage regulator are shown in Fig. 2.116. An external PNP transistor, Q1 is connected. Resistances can be from 1 kΩ to 10 kΩ. If magnitude of -Vi is less than 9V, connect VCC+ and VC to a positive supply such that VCC+ to VCC- is greater than 9V, for proper

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