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Voltage Regulator Circuits

Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S      
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Last Updated: 09/06/2020 02:31 PM

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-778-8210

Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

Paralleled Voltage Regulators with Balanced Load Sharing -  Paralleling voltage regulators to provide mode load current is a common technique.  Forcing the amplifiers to share the load current equally is called ballasting.  Using a precision low offset voltage amplifier to sense the output current from each regulator requires just milli-ohms of resistance, typically just a pcb circuit trace.  Each amplifier then adjusts the output voltage of each regulator to force the output currents to be equal.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Part 1: 200W-48 AdvancedTCA Hot Swap Controller with I2C Input/Output Monitoring & Power Good Watchdog -  The LTC4261 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane.  Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate.  The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses __ Linear Technology/Analog Devices App Note, Mar 26th 2010

Part 2: 200W-48 AdvancedTCA Hot Swap Controller with I2C Input/Output Monitoring & Power Good Watchdog -  The LTC4261 negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane.  Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate.  The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses __ Linear Technology/Analog Devices App Note, Mar 26th 2010

Pass Regulator's Output Ranges From 0 to 20 -  04/13/95 EDN Design Ideas:  Adjustable-voltage pass regulators normally allow the output infinite adjustment between some maximum VOUT and one bandgap voltage away from ground.  The internal bandgap reference for the error amplifier limits the minimum output voltage.  Some regulators have well-behaved, constant ground currents so that you can "float" the pass regulator on top of an adjustable resistor. Design by Marvin Vander Kooi

Pass Transistor Lowers Dropout Voltage -  02/18/99 EDN Design Ideas:  NOTE:  File contains several circuits, please scroll to this this one.   With linear regulators, you measure dropout voltage, ViNVOUT, at the minimum input voltage for which the IC sustains regulation.  Low dropout means longer battery life, because the load circuit continues to operate while the battery discharges to a lower terminal voltage Design by Matt Schindler, Maxim Integrated Products, Sunnyvale, CA

Peak Detector Operates From Single Supply -  05/12/94 EDN Design Ideas:  The circuit in Fig 1  can detect the peak of either positive or negative inputs, yet it operates from a single supply.  The circuit uses two unity-gain amplifiers to monitor the input signal, one an inverting amplifier and the other a noninverting amplifier.  A typical application is driving a VU meter Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Peltier Devices or Thermoelectric Modules. -  Also known as TE Modules or Solid State Heat Pumps.   __ Designed by G.L. Chemelec

Performance Enhancement Techniques for 3-Terminal Regulators -  AN2 Linear Technology This App Note describes a number of enhancement circuit techniques used with existing 3-terminal regulators which extend current capability, limit power dissipation, provide high voltage output, operate from 110VAC or 220VAC without the need to switch transformer windings, and many other useful application ideas.  __ Linear Technology/Analog Devices

Performance Enhancement Techniques for Three-Terminal Regulators -  Linear Technology AN2 __ Designed by Jim Williams - Aug 2nd, 1984

Performance Verification of Low Noise, Low Dropout Regulators -  Linear Technology AN83 __ Designed by Jim Williams - Mar 1st, 2000

Philips GM 6012 AF Millivoltmeter manual w/schematic -  vintage television (schematic)  __ Designed by Frank Pocnet

Philips PW 4029 regulated power supply schematic -  vintage television (schematic)  __ Designed by Frank Pocnet

PLL-based converter controls light source -  EDN Design Ideas:  July 2, 1998        [  NOTE:    FILE
has multiple design, scroll for this one.]  Using the circuit in Figure 1, you can digitally control the light intensity of a lamp.  The control loop is based on a PLL, in which the VCO comprises a light-to-frequency converter (TSL220) coupled to a light source that derives its drive from a switching regulator (L4970A).  The output of the phase/frequency comparator (4046) serves as the control voltage for the switching regulator.  The control voltage is proportional to the frequency error between the reference frequency (fREF) and the signal frequency (fiN) coming from the light-to-frequency converter. Design by Masso Gottardi, ITC-IRST, Trento, Italy

Portable 3.3V & 5V Regulator -  A DIY kit for Arduino xBee or other projects. __ Contact Jameco Electronics

Portable CD Player Adapter for Car -  Whenever I'm in the car listening to my favourite CD, it always happens-my batteries go dead.  To solve that problem, I built this extremely simple regulator circuit.  it steps down the 12V from the lighter socket to 9V which is used by the CD player __ Designed by Aaron Cake

Positive Regulator Makes Dual Negative-Output Converter -  06/26/03  EDN Design Ideas:  Some systems, such as optical networks, require than one negative voltage.  A common procedure is to boost the main negative supply of -5V to -10V and then reduce it with a linear regulator to -9V.  The -5V itself comes from a positive Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Positive regulator makes negative DC/DC converter -  12/26/02 EDN Design Ideas:  Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost DC/DC converters.  Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs  that have positive-reference feedback voltages far outnumber these negative-feedback regulators Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Postregulation technique efficiently supplies multiple output voltages -  01/15/98  EDN Design Ideas:  Various methods for regulating multiple-output power supplies exist.  An emerging technique--secondary-side post regulation, or SSPR--provide as advantages for high-frequency, high-power-density DC/DC converters.  Many electronic devices require two or more Design by Gedaly Levin, Cherry Semiconductor Corp

Potentiometer Programs & Stabilizes Voltage Reference -  05/30/02 EDN Design Ideas:  The potentiometer portion of a mixed-signal, digitally programmable potentiometer adds variability to an analog circuit, and its controls provide programmability.  You can use a potentiometer in two ways in an analog circuit.  You can use it as a two-terminal variable resistance, or rheostat, or as a three-terminal resistive divider.   / (schematic / circuit added 11/03] Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA - May 30, 2002

Power Supplies & Regulators -  includes several designs, scroll down.  new low power discrete switcher __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Power Supply (psu 1) -  One of the most useful circuits for the home constructor is the Power Supply Unit.  A transformer with tapped secondaries can give a range of output voltages for testing and operating home-made equipment. __ Designed by Harry Lythall-SM0VPO

Power Supply (PSU 3) -  I have done some work with DC PSUs over the past few months but some of the designs were either complex or "basic performers".  I therefore decided that it was about right to produce a bench PSU that was simple enough to be made into another kit and have a reasonable performance too. __ Designed by Harry Lythall-SM0VPO

Power Supply Accepts Wide Input-Voltage Range -  02/17/11  EDN Design Ideas:  A SEPIC -based power supply runs from 1.5V to 20V.  The switching power supply in Figure 1 produces 3.3 V dc from an input voltage of 2.5 to 20V dc with high efficiency.  The circuit operates at an input voltage as low as 1.5V once it starts from a minimum of 2.5V dc, allowing the switcher to fully discharge a pair of alkaline cell batteries nearing end of life.  The power supply can also run efficiently off higher input voltages, such as 12V automotive power.  The heart of the circuit is a SEPIC  (single-ended-primary-inductance-converter) -based switching power supply, which provide as an output voltage greater than or less than the input voltage (Reference 1).   Design by Jim Windgassen, Northrop Grumman Undersea Systems, Annapolis, MD

Power Supply Converted from a PC -  Our energy-hungry and environmentally aware society has been slow to make good use of the sun's "free" power. But now it's finally taking off. Using the sun's heat directly, for cooking and other applications, is already a common and popular technology in countries that have good weather. Hot-water panels are nowadays used in many parts of the world, in combination with a gas or electric powered water heater to help out when the weather doesn't help. But at the same time, electric solar panels are still expensive, justifying their use only as a novelty, or in locations where little power is needed, and bringing in commercial power would be even more expensive. __ Designed by Manfred Mornhinweg

Power Supply Converted from a PC link -  This ATX PS board has leads for +5 (RED) , -5 (White) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN).  Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes.  The fan has also been unplugged for better viewing.  Since this PS was converted for use in the logic and robotics labs, the selected voltages  __ Designed by Andy Batts

Power Supply Fits Into Small Spaces -  11/13/03 EDN Design Ideas:  The demand for negative-voltage power supplies is increasing with the popularity of applications for portable devices.  it can be expensive and relatively complicated to generate a negative supply from a positive input source, especially when the design requires both positive and negative outputs Design by Raymond Zheng, Linear Technology, Milpitas, CA

Power Supply Modules for the P54C-VR Pentiumr Microprocessor -  AN63  This App Note describes the design of both linear and switching regulators which provide power for 90MHz Pentium (r) processors.  The circuits are intended to comply with intel's modular power supply specification and provide sufficient power for cache RAM and chip sets in addition to the CPU__ Linear Technology/Analog Devices

Power Supply Provides +5VDC Regulated, +10VDC Unregulated & 7.5VAC -  Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC.  The supply is suitable for microcontroller experimenting.   __ Designed by Wichit Sirichote

Power Supply Reversal Correcter-Cum-Preventer -  When power-supply polarities of an electronic device are accidentally interchanged, the device runs the risk of damage.  The danger can be avoided by adding this tiny circuit to the power supply...__ Electronics Projects for You

Power Supply Voltage & Current Regulated -  A Versatile and Most useful device, Especially for the Beginner __ Designed by G.L. Chemelec

Power USB VBUS in Autos with the LT8697 -  USB sockets appear in an increasing number of car models as portable devices become more ubiquitous.  The USB interface delivers power to portable devices via the 5V VBUS and ground lines.  Depending on the USB version and the portable device, the VBUS sources up to 2.1A.  in a car, this high VBUS current presents a challenge.  __ Linear Technology/Analog Devices App Note, Trevor Crane Design Engineer-Power Products Jul 15th 2013

Power-Miserly Voltage Reference Needs Just One Pin -  20-Aug-09 EDN Design Ideas:  A capacitor holds a reference voltage so that the microcontroller pin can perform other tasks Design by Peter T Miller, Applied Inspirations LLC, Bethlehem, CT

Power-Supply Failure Alarm -  Most of the power-supply failure indicator circuits need a separate power-supply for themselves.  But the alarm circuit presented here needs no additional supply source. __ Designed by M.K. CHANDRA MOULEESWARN

Power-Supply Tracks Control Input -  12/21/95 EDN Design Ideas:  The power-supply circuit in Figure 1 tracks a control input whenever the input is between 5 and 5.7V, maintains a minimum output voltage of 5V whenever the control input is less than or equal to 5V, maintains a maximum output voltage of 5.7V whenever the control input is greater than or equal to 5.7V, and implements foldback current limiting such that iKNEE is approximately equal to 700 mA and is is approximately 0 mA Design by Tony Zizzo, Burr-Brown Corp Tucson, AZ

Precision 10V Reference -  A precision 6.9V reference can be scaled up to +10V and then inverted with a precision -1 gain stage to provide symmetrical +/-10V reference voltages.  The 3.3 K resistor feeding back to the + input of the non inverting amplifier maintains a constant 1mA of current to bias the zener reference device.  __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Precision reference bans precision resistors -  06/10/99 EDN Design Ideas:  Combining a switched-capacitor charge pump with a precision reference yields an inverted reference from a positive power supply Design by Budge Ing, Maxim Integrated Products, Sunnyvale, CA

Precision Voltage follower -  in the previous op-amp experiment, the amplifier was used in "open-loop" mode; that is, without any feedback from output to input.  As such, the full voltage gain of the operational amplifier was available, resulting in the output voltage saturating __ Designed by EETech Media, LLC.

Precision voltage reference Delivers 80 mA -  12/01/06 EDN Design Ideas:  Robust, 4.096V reference source packs a punch Design by James Horste and Gary Staiman, Maxim Integrated Products Inc, Sunnyvale, CA

Proportional thermoregulator synchronizes to line -  04/13/00 EDN Design Ideas:  The circuit in Figure 1 is a proportional thermoregulator in which the switching of the TRIAC occurs when the mains voltage crosses the zero level.  As a result, the circuit generates no RFi.  The circuit can easily achieve linear regulation and perfect isolation between the control and power sections.  Whenever the mains voltage crosses zero, a 1-msec positive pulse appears at the collector of Q 1 .   Design by Jordan Dimitrov

Protection Feature Enhances Boost Converter -  10/27/94 EDN Design Ideas:  A boost-topology switching regulator is the simplest solution for converting a two to three-cell input to a 5V output.  Unfortunately, boost regulators have several inherent disadvantages, including a lack of short-circuit protection and shutdown capability.  in some battery-operated Design by Dimitry Goder, Linear Technology Corp, Milpitas, CA

Provide ADSL Frequency Reference -  05/25/00 EDN Design Ideas:  The discrete-multitone (DMT) frequencies that asymmetrical-digital-subscriber lines (ADSL) use are integral multiples of a common frequency, and the symbol period is the inverse of this frequency.  integration over the symbol period allows the sine and cosine orthogonal waveform products to vanish for all multiples of the common frequency except for those having the same frequency.    Design by Bert Erickson, Fayetteville, NY

Provide Leading-Edge Blanking -  05/29/03  EDN Design Ideas:  in isolated switch-mode power supplies using peak-current-mode control, generally the current-sense resistor senses the current on the primary side of the power converter.  Figure 1 shows a typical circuit, in which R2 is the current Design by Michael O'Loughlin, Texas Instruments, Dallas, TX

Provide Reference for Multiple ADCS -  24-Jan-02 EDN Design Ideas:  The achievable accuracy for systems with multiple ADCs depends directly on the reference voltages applied to the ADCs.  Medical-ultrasound-imaging systems, for example, commonly include a large number of ADCs in the system's beam-former electronics, with the ADCs usually organized in groups of 16, 24, 32, and so on Design by Ron Gatzke and Tanja Hofner, Maxim Integrated Products, Sunnyvale, CA

Pushbutton replaces rotary switch -  26-Oct-00 EDN Design Ideas:  The problem of setting any one of four modes of aC-operated process has a straightforward solution  Have the C check the states of some 4 bits of aC.    Design by Abel Raynus, Armatron International Inc, Melrose, MA

PWM IC makes synchronous gate driver -  02/02/99 EDN-Design ideas (contains several designs, scroll to find this one) A system with a P, memory, and peripherals usually requires several power-supply voltages.  Designers typically use local switching regulators to produce the desired voltage rails.  One of the most common topologies, the synchronous buck regulator, converts a 5 or 12V bus to some other, lower voltage.   Design by Dimitry Goder, Switch Power Inc, Campbell, CA


Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S       T - Z

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