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Regulator Circuits
Regulators:  #'s - A       B - G       H - Q       R - S       T  - Z


Last Updated: October 24, 2017 02:55 PM
Circuits Designed by Dave Johnson, P.E. :

Battery Eliminator - If you use a 1.5v or a 3v battery powered MP3 player for long periods of time, you may get tired of constantly changing batteries.  Some older players do not work will NiMH
rechargeable batteries so changing out batteries can get expensive.  The circuit be. . . Circuit by David A. Johnson P.E.-June, 2005

Capaciatance-Based Touch Switch - This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002

Caps Provide Voltage Boost to Series Regulator - This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply. . . Circuit by David Johnson P.E.-January, 1998

Circuit Eliminates 9v Battery - If you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the c . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2009


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

Basic 2A, 4-Cell Li-Ion Battery Charger with C/10 Termination -  The LTM8062/LTM8062A are complete 32ViN, 2A μModule power tracking battery chargers.  The LTM8062/ LTM8062A provide a constant-current/constant-voltage charge characteristic, a 2A maximum charge current, and employ a 3.3 V float voltage feedback reference, so any desired battery float voltage up to 14.4V for the LTM8062 and__ Linear Technology/Analog Devices App Note, Sep 12th 2012

Battery Backup Regulator is Glitch-Free & Low Dropout -  DN170 Design Notes __ Linear Technology/Analog Devices

Battery Eliminator -  if you use a 1.5v or a 3v battery powered MP3 player for long periods of time, you may get tired of constantly changing batteries.  Some older players do not work will NiMH
rechargeable batteries so changing out batteries can get expensive.  The circuit be. . . Circuit by David A. Johnson P.E.-June, 2005

Bi-Directional Buck-Boost Supercapacitor Backup Supply -  The LT8705 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage.  The part has integrated input current, input voltage, output current and output voltage feedback loops.  With a wide 2.8V to 80V input and 1.3V to 80V output range, the LT8705__ Linear Technology/Analog Devices App Note, Feb 15th 2013

Bi-Directional Motor Speed Regulator -  This circuit shows the concept I used in the drill motor control that I submitted earlier.  I cam up with it in 1994 when I built the device.  My algebra and my patience are a bit too rusty at my age now to write an equation that describes the relationship between the BEMF of the motor and Vin.   __ Designed by Andrew R. Morris

Big Power for Big Processors: the LTC1430 Synchronous Regulator -  DN113 Design Notes__ Linear Technology/Analog Devices

Boost Regulator Makes Low Profile SEPIC with Both Step-Up & Step-Down Capability -  DN317 Design Notes __ Linear Technology/Analog Devices

Boosted LM317/LM337 Regulators -  Transistors types have been altered to ones that are more readily available.  __ 

Boosting Regulator Current -  An outboard pass transistor used to increase the current output of a voltage regulator IC .   __ Designed by Andy Collison

Buck converter charger also provides system power -  11/16/96 Literature Number: SNVA532Switching Regulator provides charge voltage setpoint with Current regulation, and second Switching Regulator provides 5V System Power -Many systems require long-time operation during periods of power loss.  Often, a gel or wet-cell lead-acid battery is best choice because of high capacity and relatively low cost.  The battery charges __ Designed by Application Note Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Buck converter works efficiently from phone line -  02/15/00 EDN Design Ideas:  A switching converter provide as an inexpensive way to generate 5V, 18 mA (48V, 5 mA maximum) directly from a standard phone line (Figure 1).  The high input voltage and low available current require a unique design approach to achieve high efficiency.  The circuit uses the LM2597HVM, which has a 60V rating and power-saving features.   __ Circuit Design by Wayne Rewinkel, National Semiconductor, Santa Clara, CA

Buck or Boost: Rugged Fast 60V Synchronous Controller Does Both -  DN370 Design Notes__ Linear Technology/Analog Devices

Buck regulator controls white LED with optical feedback -  10/25/07  EDN-Video Design ideas - By using optical feedback, you can stabilize the output level of a high-intensity LED __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Buck regulator forms high-power, inverting –5V supply -  04/01/04  EDN Design Ideas:  Configuring a step-down switching-converter IC as an inverter yields an efficient, high-power, -5V supply that can of deliver currents as high as 4.5A at the 12V input or 3.2A at the 5V input (Figure 1).  Conventional inverting power  __ Circuit Design by Bruce Denmark, Maxim Integrated Products, Sunnyvale, CA

Buck Regulator Operates Without a Dedicated Clock -  08/21/03 EDN Design Ideas:  Most switching regulators rely on a dedicated clock oscillator to determine the switching frequency of operation.  A dedicated oscillator circuit within the power controller usually generates the clock signal.  A class of hysteretic switching regulators can actually operate at a relatively fixed frequency without a clock, even with changing input-line and output-loading conditions __ Circuit Design by Robert Bell, National Semiconductor, Phoenix, AZ

Buck Regulator Terminates Fast Data Buses -  07/20/95 EDN Design Ideas:  The limitations of 5 and 3.3V CMOS buses are spurring the development of high-speed, low-voltage buses for the next generation of computers.  These buses, such as Futurebus and Rambus, require low-voltage supply rails to reduce signal-voltage swings.  Other buses, such as CTT (center-terminated transceiver) and HSTL (high-speed transceiver logic) , have center termination and, therefore, require a power source that can sink current as well as source it __ Circuit Design by Bruce Moore, Maxim Integrated Products, Sunnyvale, CA

Buck Regulator Uses Step-Up Controller -  11/09/95 EDN Design Ideas:  The circuit in Fig 1uses a step-up (boost) DC/DC controller in a negative buck-regulator application.  The circuit’s function is to power the laser diode in an optical amplifier/booster unit, a job for which no commercial IC is available.  The anode of the laser diode connects to ground, so the supply voltage must be negative and must deliver 160 to 750 mA.  Although the boost-regulator IC operates in a buck-regulator circuit, its standard connections permit proper control of Q1.  However, you need an op amp __ Circuit Design by Massimo De Marco, Maxim Integrated Products Cusano Milanino, Italy

Buck Regulator with LDO Post Regulation for Low Noise & Ripple -  The LT3070 is a low voltage, UltraFast transient response linear regulator.  The device supplies up to 5A of output current with a typical dropout voltage of 85mV.  A 0.01μF reference bypass capacitor decreases output voltage noise to 25μVRMS.  The LT3070’s high bandwidth permits the use of low ESR ceramic capacitors, saving__ Linear Technology/Analog Devices App Note, Apr 22, 2011

Buck/Boost Charge Pump Regulator Powers White LEDs from a Wide 1.6 Volt to 5.5 Volt Input -  App Note #1021__ Maxim Integrated

Buck-Boost Regulator Suits Battery Operation -  09/04/03  EDN Design Ideas:  A buck/boost converter can step a voltage up or down.  Such a converter is appropriate for battery-powered applications.  One application derives a regulated 14.1V at 1A from 12V solar panels with 9 to 18V variation.  in this type of b __ Circuit Design by Kahou Wong, On Semiconductor, Phoenix, AZ

Buck-converter charger also provides system power -  05/22/97 EDN Design Ideas:  Switching Regulator provide as  charge voltage setpoint with Current regulation, and second Switching Regulator provide as5V System Power -Many systems require long-time operation during periods of power loss.  Often, a gel or wet-cell lead-acid battery is  best choice because of high capacity and relatively low cost.  The battery charges __ Designed by Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Capaciatance-Based Touch Switch -  This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002

Capacitor & EMI Considerations New High Frequency Switching Regulators -  DN95 Design Notes__ Linear Technology/Analog Devices

Caps Provide Voltage Boost to Series Regulator -  This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  it can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply. . . Circuit by David Johnson P.E.-January, 1998

CCD Bias Supply (15V,-8V) -  From 2.7V to 5V input, the LT3463 generate the positive (15V AT 10mA) and negative (-8V AT 50mA) bias voltages required for CCD imaging sensors __ Linear Technology/Analog Devices App Note, Mar 24th 2010

Ceramic output capacitors enhance internally compensated switchers -  07/20/06  EDN Design Ideas:  Restore switching regulator stability when you change output-capacitor compositions __ Circuit Design by Robert Kollman, Texas Instruments, Dallas, TX

Change Improves Regulators’ Reliability -  05/12/94 EDN Design Ideas:  The standard circuit for adjustable, 3-terminal regulators (LM317, LM350, etc]in Fig 1a suffers from a designed-in fault  if  potentiometer R2’s wiper loses contact, regulator’s output goes high.  Because  potentiometer is  most unreliable part in  circuit, consider using  circuit in Fig 1b.  Now,  __ Circuit Design by Peter Demchenko, VN, Vilnius, Lithuania

Charge Supercapacitors to 7V from USB Power -  04/26/07 EDN Design Ideas:  Switching regulator charges three supercapacitors with current limit.    __ Circuit Design by Fran Hoffart, Linear Technology, Milpitas, CA

Cheap PWM IC makes synchronous gate driver -  02/04/99 EDN Design Ideas:  NOTE:    Page includes several designs.  Scroll to find this one.  A system with a µP, 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.  This approach has gained vast acceptance, thanks to its relative simplicity __ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Circuit Charges Supercapacitors to 7V from USB Power -  04/26/07 EDN Design Ideas:  Switching regulator charges three supercapacitors with current limit.    __ Circuit Design by Fran Hoffart, Linear Technology, Milpitas, CA

Circuit Eliminates 9v Battery -  if you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the c . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2009

Circuit limits DV/DTand Capacitor inrush at Regulator Turn On -  10/11/07 EDN Design Ideas:  Adding a simple circuit to the adjust pin of a regulator controls the dV/dt of the output voltage, limiting inrush current __ Circuit Design by W Stephen Woodward, Chapel Hill, NC

Circuit Secures Bootstrap Operation Under Light Load -  05/12/11  EDN Design Ideas:  Additional circuit lets a capacitor charge, preventing voltage dips.  A previous Design idea highlights a potential issue of a bootstrap IC under light-load or prechargedload operation (Reference 1).  The circuit in Figure 1, with the additional circuit in the green box, fixes the problem of a voltage dip in the bus-voltage signal.  The waveforms in Figure 2 demonstrate how this problem takes place in buck converter IC 1B when its output voltage, VBUS, dips below the regulation point at a fixed rate under no load.  By inspecting the other traces in Figure 2, you can conclude that the dip of VBUS occurs __ Circuit Design by Chee Hua How

Circuitry for Signal Conditioning & Power Conversion -  AN75 Linear Technology This publication includes designs for data converters and signal conditioners, transducer circuits, crystal oscillators and power converters.  Wideband micropower circuitry receive special attention.  Tutorials on micropower design techniques and parasitic effects of test equipment are included.  __ Linear Technology/Analog Devices

Circuitry for Single Cell Operation -  AN15 1.5V powered circuits for complex linear functions are detailed.  Designs include a V/F converter, a 10-bit A/D, sample-hold amplifiers, a switching regulator and other circuits.  Also included is a section of component considerations for 1.5V powered linear circuits.  __ Linear Technology/Analog Devices

Clairvoyance Marries Remote Sensing -  Linear Technology AN126 __ Designed by Jim Williams - Oct 1st, 2010

Compact Inductorless Boost Regulates White LED Bias Current -  App Note #1116__ Maxim Integrated

Compact Step-Up Converter Conserves Battery Power -  DN358 Design Notes __ Linear Technology/Analog Devices

Compact μTCA 12V & 3.3V Hot Swap Solution for Advanced Mezzanine Cards -  The LTC4223 positive voltage Hot Swap controller allows a board to be safely inserted and removed from a live AMC or MicroTCA backplane.  it controls the main 12V supply with an external N-channel MOSFET and the 3.3 V auxiliary supply with an integrated switch.  The 12V output ramp rate is adjustable and includes inrush current __ Linear Technology/Analog Devices App Note, Mar 26th 2010

Control an LM317T with a PWM signal -  02/03/11  EDN Design Ideas:  Set a regulator's output voltage under microprocessor control.  The LM317T from National Semiconductor is a popular adjustable-voltage regulator that provide as output voltages of 1.25 to 37V with maximum 1.5A current.  You can adjust the output voltage with a potentiometer.  The circuit in Figure 1 replaces the potentiometer with an analog voltage that you can control from a PWM (pulse-width-modulation) signal.  You control this signal with a microcontroller or any other digital circuit.  You can use the same microcontroller to dynamically monitor the output and adjust the LM317T.   __ Circuit Design by Aruna Rubasinghe

Create a Virtual Ground with the LT1118-2.5 Sink/Source Voltage Regulator -  DN115 Design Notes __ Linear Technology/Analog Devices

Current booster for 78nn series voltage regulators -  Volt regulators such as the LM708, and LM317 series (and others) sometimes need to provide a little bit more current then they actually can handle.  if that is the case, this little circuit can help out.  A power transistor such as the 2N3772 or similar can be used (See the project on the 3-part variable power supply)  __ Designed by Tony van Roon  VA3AVR

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Regulators:  #'s - A       B - G       H - Q       R - S       T  - Z

 


Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches



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