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


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Regulate a 0 to 500V, 10-Ma Power Supply In a Different Way -  12/20/2012-EDN Design Ideas:  Contemporary power supplies use switching techniques to achieve the desired output voltage from the primary source.  Switching power supplies, however, are often too noisy to be used in sensitive analog circuits.  You may find linear power suppl __ Circuit Design by Dusan Ponikvar

Regulated Charge Pump Delivers 50ma -  App Note #35__ Maxim Integrated

Regulator Can Source & Sink Current -  12/07/95  EDN Design Ideas:  Although a positive supply regulator usually acts solely as a current source, some applications require both sourcing and sinking.  For these applications, Linear Technology’s LT1118 family of low-dropout regulators can source and sink as much as 800 and 4 __ Circuit Design by Bill Schweber Linear Technology Corp, Milpitas, CA.

Regulator Generates as Many as Four Voltages -  08/03/95 EDN Design Ideas:  The inexpensive switching regulator in Fig 1 provide as as many as four voltages using a single quad comparator.  The circuit can implement two positive regulated supplies and two semiregulated negative supplies that use a charge-pump technique.  Fig 1's circuit, which costs $4.48 in moderate volumes, shows three of the four possible output voltages, ±9V and 150V.  You can add a 150V supply using the same charge-pump techniques as the 9V supply.  Output current of the +9V supply is nominally 10 mA.    __ Circuit Design by D Hayden, Hayden Electronics Design, San Diego, CA

Regulator Generates Both 3.3V & 5V Outputs from 3.3V or 5V to Run Computers & RS-232 -  DN71 Design Notes__ Linear Technology/Analog Devices

Regulator Generates Sub-Bandgap Voltage -  01/02/97 EDN Design Ideas:  100-mA regulator that uses a dual linear-regulator IC to produce output voltages below1.25V from2.9 to5.5V input-voltage range __ Circuit Design by Ronald Young and Luong Huynh, Maxim Integrated Products, Sunnyvale, CA

Regulator has One Active Part -  03/16/95 EDN Design Ideas:  The regulator of unusual simplicity (ROUS) in Fig 1 derives a low-voltage, low-current output from rectified 115 to 270V ac.  Pass transistor Q1 is the regulator's only active component.    __ Circuit Design by Kennan C Herrick, ESI Electronics Corp San Francisco, CA

Regulator provides ±12V -  10/23/97 EDN Design Ideas:  Simple circuit can provide ±12V from a5V input using only one switching-regulator IC and a few off-the-shelf __ Circuit Design by Musiri Shrivathsan, National Semiconductor Corp, Santa Clara, CA

Royer Topology Achieves 100μVp-p Noise at 250V Output -  This circuit's resonant Royer topology achieves 100μVP-P noise at 250V output by minimizing high frequency harmonic in the power drive stage.  The self oscillating resonant Royer circuitry is composed of Q2, Q3, C1, T1 and L1.  Current flow through L1 causes the T1, Q2, Q3, C1 circuitry to oscillate in resonant fashion, supplying __ Linear Technology/Analog Devices App Note, Apr 22, 2011

Save 3 DB of Output Power using Feedback to Set the Output Impedance -  10/06/11  EDN Design Ideas:  You can use this with high-side or low-side output current sensing.   __ Circuit Design by Vic Jordan, Carson City, NV

Scheme Adds Sequencing & Shutdown Control to Regulator -  10/30/03  EDN Design Ideas:  Modern microprocessor- or FP-GA-based circuits require separate and independent power-supply voltages for the core and the i/O circuits.  Some devices require stringent control of the turn-on characteristics and sequencing of these  __ Circuit Design by Said Jackson, Equator Technologies Inc, Campbell, CA

SCR Voltage Regulator -  Though not as accurate as a linear or a high-frequency switching regulator, an SCR voltage regulator wastes little power and creates no RFi.   __ Designed by Andrew R. Morris

Secondary Side Dual Output Controller Tightly Regulates Two Isolated Outputs -  DN1000 Design Notes  __ Linear Technology/Analog Devices

Secure 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

Series Regulator with Q900 -  This is a series regulator with Q900 being the control element, Q901 a driver, and Q902 an error amp.  ZD900 forms the emitter reference voltage source.  Since the generated high voltage and other voltages are linked by means of the magnetic field of T900, any change in H.  V.  will be reflected back to all of the other voltages.   __ Designed by Chris Candreva

Servo loop improves linear-regulator efficiency -  8-Jul-04 EDN Design Ideas:  Linear regulators are easy to implement and have better noise and drift characteristics than switching approaches.  Their largest disadvantage is inefficiency  excess energy dissipated as heat.  Several well-known techniques are available to minimize the input-to-output voltage across a linear regulator __ Circuit Design by Aurel Gontean, Technical University, Timisoara, Romania

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

Simple Circuit & Efficient Sub-2W Isolated Power Supply -  The non-synchronous flyback topology is widely used in isolated power supplies ranging from sub watt power levels to tens of watts.  With more green-mode standards emerging around the world, improving light load efficiency and reducing no-load input standby current are more demanding than ever.  Unfortunately, the traditional__ Linear Technology/Analog Devices App Note, Min Chen Senior Design Engineer-Power Products Nov 5th 2012

Simple Circuit flyback regulator with LM2577 -  (5V to ±15V/225mA) __ hobbyteam @ hobby-hour.com

Simple Circuit High Efficiency Step-Down Switching Regulator -  DN73 Design Notes__ Linear Technology/Analog Devices

Simple Circuit Regulator Has One Active Part -  03/16/95 EDN Design Ideas:  The regulator of unusual simplicity (ROUS) in Fig 1 derives a low-voltage, low-current output from rectified 115 to 270V ac.  Pass transistor Q1 is the regulator's only active component.    __ Circuit Design by Kennan C Herrick, ESI Electronics Corp San Francisco, CA

Simple Circuit regulator provides ±12V -  10/23/97 EDN Design Ideas:  Simple circuit can provide ±12V from a5V input using only one switching-regulator IC and a few off-the-shelf __ Circuit Design by Musiri Shrivathsan, National Semiconductor Corp, Santa Clara, CA

Simple Circuit Switching Regulator -    NOTE: Scroll down - When batteries are used to power lower voltage circuits, a switching regulator is desirable to conserve battery life. There are excellent ICs  that can do the job with great efficiency and small size. An example is the Maxim (www.maximic.com) MAX639 which converts inputs from 5.5 to 11.5 volts to 5 volts at up to 225mA.  The only additional parts are an inductor, schottky rectifier and a couple of capacitors. The following circuit is a discrete switcher similar in power handling capability to the MAX639. __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Simple Circuit temperature regulated FAN speed Controller -  This regulator uses a P-FET to change the positive supply voltage to a FAN an NTC resistor mounted on the device that needs cooling will change the fan speed, the temperature on the heat sink will therefore be constant, while the FAN speed will change, depending on power disipated The RPM output signal from most FAN types will continue to function, __ 

Simple Circuit Ultra-Low Dropout Regulator -  DN32 Design Notes__ Linear Technology/Analog Devices

Simple Circuit Variable Voltage Source -  The high current regulator below uses an additional winding or a separate transformer to supply power for the LM317 regulator so that the pass transistors can operate closer to saturation and improve efficiency.  For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors should be close to the output voltage.  The LM317 requires a couple extra volts on the input side, plus the emitter/base drop of the 3055s, plus whatever is lost across the (0.1ohm) equalizing resistors (1volt at 10 amps) , so a separate transformer and rectifier/filter circuit is used that is a few volts higher than the output voltage __ Designed by Bill Bowden

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

Single IC Five Output Switching Power Supply System for Portable Electronics -  DN150 Design Notes__ Linear Technology/Analog Devices

Single Phase Step-Down DC/DC Controller with Digital Power System Management & Input Current Sense -  The digital power supply market has achieved rapid progress in the recent years.  Easy configuration, accurate telemetry, convenient fault analysis and reliability are the trends for the modern digital power supply, which are all provided by Linear’s new digital power controller, the LTC3883.  The LTC3883 is a single phase __ Linear Technology/Analog Devices App Note, Yi Sun-Applications Engineer Oct 4th 2012

Six Output DC/DC μModule Regulator from 3V to 72V Input -  The LTM8008 is a 72ViN, μModule SEPIC  converter with six post regulators.  The SEPIC  controller’s fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages and features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit.  The LTM8008 also includes six high performance, fixed output LDOs for post-regulation__ Linear Technology/Analog Devices App Note, Dec 22, 2010

Smart ripple canceller offers near-zero dropout -  03/10/14 EDN Design Ideas:  Eliminate linear power supply ripple losslessly!  Ripple cancellers, also known as ripple-eaters, gyrators, or electronic filters, are useful when a supply needs to be clean but the absolute supply voltage is unimportant.  A typical application of these circuits is in class-A power amplifiers.  Compared to a linear regulator, they waste less power since they adapt themselves to the input voltage.   __ Circuit Design by Louis Vlemincq

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

 


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