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	Linear regulator - Wikipedia, the free encyclopedia
		This regulator is used for very simple low power applications where the currents involved are very small and the load is permanently connected across the zener diode (such as voltage reference or voltage source circuits).
		Common solid-state series voltage regulators are the LM78xx (for positive voltages) and LM79xx (for negative voltages), and common fixed voltages are 5 V (for transistor-transistor logic circuits) and 12 V (for communications circuits and peripheral devices such as disk drives).
		In fixed voltage regulators the reference pin is tied to ground, whereas in variable regulators the reference pin is connected to the centre point of a fixed or variable voltage divider fed by the regulator's output.
	en.wikipedia.org /wiki/Linear_regulator (1305 words)

	Station Information - Linear regulator
		A linear regulator is an electronic power supply circuit that attempts to produce a smoothed, constant-voltage, output from a varying input voltage.
		Linear regulators are so named because they contain a transistor operating in its "linear region", with the transistor acting like a variable resistor rather than an on/off switch (as in a switching regulator).
		The most common linear regulators are three-terminal integrated circuits in P1d packages (the kind medium-power transistors commonly come in - three legs in a straight line protruding from a fl ceramic square with a metal backplate which has a hole for bolting to a heatsink).
	www.stationinformation.com /encyclopedia/l/li/linear_regulator.html (482 words)

	Voltage regulator - Wikipedia, the free encyclopedia
		A voltage stabiliser is a type of household mains regulator which uses a continuously variable auto-transformer to maintain an AC output that is as close to the standard or normal mains voltage as possible, under conditions of fluctuation.
		SCR regulators have the advantages of being both very efficient and very simple, but because they can not terminate an on-going half cycle of conduction, they are not capable of very accurate voltage regulation in response to rapidly-changing loads.
		That is followed by a linear regulator that generates exactly the desired voltage and eliminates nearly all the noise generated by the switching regulator.
	en.wikipedia.org /wiki/Voltage_regulator (1115 words)

	Linear regulator -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08)
		A linear regulator is a (A transformer whose voltage ratio of transformation can be adjusted) voltage regulator based on a (A semiconductor device capable of amplification) transistor operating in its "linear region".
		The most common linear regulators are three-terminal (A microelectronic computer circuit incorporated into a chip or semiconductor; a whole system rather than a single component) integrated circuits in P1d packages/TO-220 package.
		The adjustment is performed by supplying a feedback path from the output terminal via a variable resistor, connected to the 'adj' terminal of the regulator, which replaces the 0v terminal - the other end of the variable resistor being connected to 0v.
	www.absoluteastronomy.com /encyclopedia/l/li/linear_regulator.htm (701 words)

	Linear regulator with output current and voltage sensing - US Patent 6750638 (Site not responding. Last check: 2007-10-08)
		The linear regulator of claim 3, wherein the energy storage device comprises at least one of a capacitor, inductor, spring, and other storage device of one of mechanical, chemical and electrical energy.
		The linear regulator of claim 14, wherein the energy storage device comprises at least one of a capacitor, inductor, spring and other storage device of one of mechanical, chemical and electrical energy.
		The linear regulator of claim 11, wherein one of the control variable and the other control variable is indicative of one of temperature and pressure.
	www.patentstorm.us /patents/6750638.html (3156 words)

	Linear regulator power supply with an overcurrent protection device - US Patent 5631549 (Site not responding. Last check: 2007-10-08)
		An improved regulator apparatus comprises a regulation unit, in response to an operation signal, for regulating an input voltage to provide a regulated voltage to its dependent load and an overcurrent protection unit for blocking the operation of the regulation unit when a short-circuiting occurs in the load.
		The linear regulator power supply of claim 1, wherein the coupling means includes a bypass transistor being turned-on in accordance with the drop in the potential level, the bypass transistor having a base connected to the output terminal, an emitter connected to the reference voltage providing means and a collector connected to ground.
		Under a normal operation of the linear regulator power supply 100, the potential level of the regulated output voltage remains higher than that of the base of the bypass transistor TR3, and therefore, the protection circuit 200 remains inoperative.
	www.patentstorm.us /patents/5631549.html (1332 words)

	App Note Abstract: Versatile UC1834 Optimizes Linear Regulator Efficiency
		Linear voltage regulators have long been an important resource to power supply designers.
		They are inefficient power converters, they lack versatility and the capability of remote voltage sensing, and finally, the most common failure mechanism for linear regulators is a shorted pass transistor.
		The UC1834 is a programmable linear regulator control IC which, with an external pass transistor, forms a complete linear power supply.
	www.ti.com /sc/docs/psheets/abstract/apps/slua062.htm (129 words)

	GMDSS (DM) FCC Element 3 Question Pool (Site not responding. Last check: 2007-10-08)
		A regulator in which the control device is switched on or off, with the duty cycle proportional to the line or load conditions.
		A regulator in which the conduction of a control element is varied in direct proportion to the line voltage or load current.
		A regulator containing a voltage reference, error amplifier, sensing resistors and transistors, and a pass element.
	members.aol.com /ab0di/el3c6.html (4390 words)

	Improved Power Supply Rejection For IC Linear Regulators - Maxim/Dallas
		In portable communications low-dropout linear regulators (LDOs) are used to generate supply voltages for the RF circuitry; these voltages must be especially clean when powering the synthesizer and voltage-controlled oscillator (VCO).
		In portable communications, low-dropout linear regulators (LDOs) are used to generate supply voltages for the RF circuitry; these voltages must be especially clean when powering the synthesizer and VCO.
		Line regulation is a steady-state DC measurement, and is a measure of the regulator open-loop current gain at zero frequency.
	www.maxim-ic.com /appnotes.cfm/appnote_number/883/ln/en (1222 words)

	ESR of regulator output capacitor
		Voltage regulator suppliers suggest, for example, that ESR of the capacitor must be less than 10 ohms to assure a stable voltage at the output.
		The interaction between the ESR of the load capacitor and the performance of your linear regulator is a matter of analyzing the stability of the feedback network used to control the regulator.
		Regulator instability was a big problem in the days of old two-layer board design.
	www.sigcon.com /Pubs/news/5_3.htm (888 words)

	Dimension Engineering
		With typical efficiencies of 40%, and reaching as low as 14%, linear voltage regulation generates a lot of waste heat which must be dissipated with bulky and expensive heatsinks.
		This is accomplished with the help of an electrical switch and a controller which regulates the rate at which energy is transferred to the output (hence the term “switching regulator”).
		Our regulators are light, small, efficient, have a wide input range, are clearly labeled and even easier to use than a linear regulator.
	www.dimensionengineering.com /switchingregulators.htm (948 words)

	Linear Post Regulators for DC-DC Converters
		Clearly, the output of the linear regulator is lower than the output of the converter by at least the dropout voltage of the linear regulator.
		The linear regulator was used at the output for line and load regulation, and it dissipated a lot of power at the high-line input level.
		Nevertheless, the internal linear regulators in the low-noise 10-W series are designed with discrete components that reduce the power density of converters and increase their cost.
	powerelectronics.com /mag/power_linear_post_regulators (1736 words)

	[No title]
		A linear voltage regulator creates this known voltage by means of transistor operating in their forward active regions and zener diode operating in their breakdown regions.
		Linear Regulators- Standard (internal feedback), Low-Dropout (external feedback), and Quasi Low-Dropout, etc. These types of circuits use the transistors operating in their linear active regions and zener diodes operating in their breakdown regions to create regulated voltages.
		For a Linear Voltage Regulator to output a regulated voltage: An unregulated DC voltage source is connected to a voltage controlled current source.
	www.engr.sjsu.edu /dzhou/EE136Web0802/THum136S.doc (713 words)

	Boost/Linear Regulator Derives 5V From Four Cells - Maxim/Dallas
		But, following the boost regulator with a linear regulator enables the combination to maintain a nominal regulated output for inputs that range above and below that level.
		During turn-on the line is high, which disconnects the load from the boost regulator by turning on Q1 and disabling the linear regulator.
		The linear regulator then resumes normal operation after the boost regulator is up and running.
	www.maxim-ic.com /appnotes.cfm/appnote_number/544 (495 words)

	Power supplies
		Linear Supplies feel the (lack of) heat from switchers in low-wattage applications - ICs that implement advanced supply techniques are challenging linear supplies by lowering costs, cutting size, and increasing efficiency.
		Linear power supplies are generally easy to construct (there are very easy to use ICs for this or they can be built quite easily using discrete components) and can easily give good quality output voltage (stable output voltage and low noise).
		Switching regulator forms constant-current source - When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor.
	www.nurohman.pk.cx /psu.html (13719 words)

	Linear Regulator : Analog Devices : Linear Regulator (Site not responding. Last check: 2007-10-08)
		No other company is more committed to developing the Linear Regulator that will make the digital future possible.
		ADI designs, manufactures and markets Linear Regulator products as well as high-performance, high-precision signal processing ICs that make pictures vibrant, voices clear, connections continuous and products portable.
		ADI is your source for the Linear Regulator as well as over 10,000 other products that serve the needs of more than 60,000 customers worldwide.
	www.analog.com /linear_regulator.html (278 words)

	National Semiconductor Knowledge Base Search (Site not responding. Last check: 2007-10-08)
		A linear regulator uses a transistor or FET, operating in its linear region, to subtract excess voltage from the applied input voltage, producing a regulated output voltage.
		The standard NPN linear regulator tends to have wide bandwidth and be insensitive to output capacitive loading.
		The allows the regulator to operate with relatively high efficiency, as the lower the power input voltage, the less power is dissipated by the regulator.
	search.national.com /iphrase/query?query=ldo (1396 words)

	ultra low drop linear voltage regulator
		The circuit is a MOSFET based linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere.
		The gate drive voltage required for the MOSFET is generated using a voltage doubler circuit consisting of diodes D1 and D2 and capacitors C1 and C4.
		Adjustable shunt regulator TL431 (IC2) is used here as an error amplifier, and it dynamically adjusts the gate voltage to maintain the regulation at the output.
	www.electronic-circuits-diagrams.com /psimages/powersuppliesckt3.shtml (551 words)

	Linear regulator keeps it quiet: News from National Semiconductor
		National Semiconductor has introduced a miniature CMOS linear regulator it reckons conducts the lowest output noise in the industry and features high power supply ripple rejection, while consuming a mere 25uA of quiescent current.
		The LP5900 is a 100mA low-dropout linear regulator optimised for powering analogue and RF signal-path integrated circuits (ICs), including low-noise amplifiers, voltage-controlled oscillators and RF receivers.
		Output noise, PSRR and power consumption of the linear regulator are critical parameters to guarantee the integrity of analogue and RF signal paths.
	www.electronicstalk.com /news/nat/nat342.html (361 words)

	U.S.Microwaves: CS52015 Ajustable linear regulator (Site not responding. Last check: 2007-10-08)
		The regulator is intended for use as a post regulator and microprocessor supply.
		The fast loop response and low dropoutvoltage make this regulator ideal for applications where low voltage operation and good transient response are important.
		Load regulation and output voltage are measured at a constant junction temperature by low duty cycle pulse testing.
	members.aol.com /usmicrows/ldoreg/CS52015.htm (401 words)

	California Micro Devices - Press Release (Site not responding. Last check: 2007-10-08)
		The CM3131 family of highly integrated all-linear voltage regulators provides a complete, single-chip power solution for Double Data Rate (DDR) and DDR II SDRAM memories and are the industry’s first products to integrate three separate linear regulators to provide VDDQ, VTT and VSTBY power from a single chip.
		The VTT regulator is a linear sink source regulator powered from the VDDQ output that supplies the VTT supply required by DDR-I memory termination resistors.
		This regulator sinks or sources up to 2A to or from the DDR-I bus termination resistors, or 0.9A at 0.9V for the chipset in DDR-II, to support both single- and dual-channel memory configurations.
	www.calmicro.com /news_events/pressreleases/pr_120803.html (845 words)

	linear_regulator (Site not responding. Last check: 2007-10-08)
		This is one example of a series, linear regulator with current limiting.
		This type of linear regulator can be thought of as a current amplifier being driven by an error amplifier.
		When the voltage at the output tries to go higher than the regulated voltage, the op amp output voltage will increase, turning on M1 more.
	www.eece.ksu.edu /~eelab2/linear_regulator.html (375 words)

	Linear regulator=low-cost dc/dc converter - 6/13/2002 - EDN (Site not responding. Last check: 2007-10-08)
		The heart of the circuit is IC, the common, inexpensive LM7805 linear regulator.
		When the output reaches the rated output of the linear regulator (5V for the LM7805), the regulator switches off its output.
		If you use a 5V regulator, efficiency drops to 65%, but that figure is still better than that of a pure linear regulator.
	www.edn.com /article/CA220404.html (468 words)

	Welcome to RCHOVER.COM - Firmtronics External Switch Mode SBEC - 5 Volt Output (Site not responding. Last check: 2007-10-08)
		These linear regulators also 'boast' thermal shutdown protection to protect the device so you don't send it back to the manufacturer each time you overload it.
		So the regulator is 'taking in' 12W but only 'giving out' 5W so there are 7W that the regulator is 'keeping'.
		These 7 Watts have to be dissipated by the regulator and do so in the form of heat (the horrible thing that causes thermal-shutdown).
	www.rchover.com /inc/pdetail?v=1&pid=6818 (1493 words)

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