Regulated and Switching Power Supplies

Fixed Positive Voltage Regulators

Fixed Positive Voltage Regulators: The series 7800 regulators provide eight voltage options, rang­ing from 5 to 24 V, as indicated in Table 43.2. These ICs are designed as fixed voltage regulators and with adequate heat sink­ing. Although these devices do not require any external component, such components can be employed for providing adjustable voltages and […]

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IC Voltage Regulators

IC Voltage Regulators: IC voltage regulators are versatile and relatively inexpensive and are available with features such as a programmable output, current-voltage boosting, internal short-circuit current limiting, thermal shutdown, and floating operation for high voltage applications. IC Voltage regulators comprise a class of widely employed ICs. Regulator IC units contain the circuitry for reference source,

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Op Amp Regulators

Op Amp Regulators: The Op Amp Regulators which includes Op-Amp Series Voltage Regulator Circuit, Current Limiting circuit, Foldback Limiting and Op-Amp Shunt Voltage Regulator Circuit. Let us see one by one in detail. Op-Amp Series Voltage Regulator Circuit: Op-amp series voltage regulator circuit is shown in Fig. 43.15. The op-amp compares the zener diode reference

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Controlled Transistor Series Regulator with Short Circuit Protection

Controlled Transistor Series Regulator with Short Circuit Protection: Controlled Transistor Series Regulator with Short Circuit Protection – If the load resistance RL is reduced or load terminals are shorted accidentally, a very large load current will flow in the circuit shown in Fig. 43.6. It may destroy the pass transistor Q1, diode or possibly some

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Controlled Transistor Series Regulator or Negative Feedback Regulator

Controlled Transistor Series Regulator or Negative Feedback Regulator: A controlled transistor series regulator is shown in Fig. 43.6. This Controlled Transistor Series Regulator circuit is quite similar to that of a simple transistor series voltage regulator except that an additional transistor Q2 is inserted in the circuit. The emitter terminal of this transistor Q2 is

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Transistor Series Voltage Regulator or Emitter Follower Voltage Regulator

Transistor Series Voltage Regulator or Emitter Follower Voltage Regulator: A simple series voltage regulator using an NPN transistor and a zener diode is shown in Fig. 43.5. This circuit is called a series regulator because collector and emitter terminals of the transistor are in series with the load, as illustrated in the figure. This circuit

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Characteristics of Regulated Power Supply

Characteristics of Regulated Power Supply: The quality of power supply depends on different factors such as its load voltage, load current, voltage regulation, source regulation, output impedance, ripple rejection etc. Some of the characteristics of regulated power supply are discussed below. 1. Load Regulation: The load regulation, abbreviated LR (also called the load effect), is

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