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Control Circuits

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Last Updated: October 24, 2017 02:54 PM

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

Low Voltage Light Dimmer -  A light dimmer is a means of controlling the "brightness" level of a lamp, in this application we will use a555 Timer to control the brightness level of a low voltage incandescent bulb of up to 60-Watts.  For the light dimmer to work the555 Timer is configured as a "variable cycle", astable oscillator running some where around300 Hz

Low-Cost Analog On-Off Controller -  Have you ever wanted to control a device based on an analog signal level? Perhaps you want to fill a water tank automatically or control exhaust fans based on humidity or temperature.  Well now, you canprovided you have a sensor that gives an analog voltage or current output.__ SiliconChip

Low-loss powers solar lantern -  1-Apr-04 EDN-Design Ideas The solar-lantern circuit in Figure 1 is a low-loss configuration that uses a 7W, four-pin CFL(compact fluorescent lamp] and a 12V, 7-Ahr, sealed, maintenance-free battery.  The inverter features greater-than-85% efficiency, less-than-2-mA quiescent current, and a shunt-charge controller with deep-discharge and overcharge protection for the battery __ Circuit Design by Ramsesh Kumar, Bangalore, India

Low-Noise AC Amplifier has digital control of gain & bandwidth -  02/05/04 EDN-Design Ideas In low-noise analog circuits, a high-gain amplifier serves at the input to increase the SNR.  The input signal level determines the input-stage gain; low-level signals require the highest gain.  It is also standard practice in low- __ Circuit Design by Philip Karantzalis, Linear Technology App Note, Milpitas, CA,

Low-Power blink led -  Schematic only, no circuit description __ Designed by Rob Crockett

Low-side switch with fast turn-off for inductive loads -  06/23/14  EDN-Design Ideas Ditch the freewheeling diode if you want fast turn off.  This Design Idea is able to turn off inductive loads at a very fast rate.   __ Circuit Design by Deivaraja Ramasamy

Low-Voltage Continuity Tester Several simple circuits were tried -a lamp, battery and probes still demanded the attention of the eyes; replacing the lamp with a buzzer was more successful but needed some three to four volts and gave no indication of a series semiconductor.   __ Designed by Tony van Roon  VA3AVR

Low-Voltage Remote Mains Switch -  This circuit allows a 240V mains appliance to be controlled remotely via low-voltage cabling and a pushbutton switch.  The mains appliance (in this case, a light bulb) is switched with a suitably-rated relay.  All of the electronics is housed in an ABS box located in proximity to the appliance.  The pushbutton switch and plugpack are

Low-voltage reset operates below 2.7V -  EDN-Design Ideas March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]  New personal digital assistants, pagers, and other battery-powered systems operate at or below 2.7V, but power-on resets with thresholds below 2.6V are not commonly available. You can resolve this problem using a circuit that combines a 1.2V reference and a micropower regulator (Figure 1a). IC1 integrates these two functions in a tiny SOT-143 package. __ Circuit Design by Bob Kelly, Maxim Integrated Products, Sunnyvale, CA

LT1166: Power Output Stage Automatic Bias System Control IC -  DN126 Design Notes__ Linear Technology/Analog Devices

LT1575 Ultrafast Linear Controller Makes Fast Transient Response Power Supplies -  AN69 AN69 describes considerations for linear regulators based on the LT1575 UltraFastTM Linear Regulator controller.  The LT1575 drives an external MOSFET pass transistor as an overdriven source follower.  This configuration results in an extremely high speed regulation (add 2/06) __ Linear Technology/Analog Devices

LT1619: Tiny Boost Controller Provides Efficient Solutions for Low Voltage Inputs -  DN255 Design Notes__ Linear Technology/Analog Devices

LT3791 Buck-Boost Controller Drives High-Power LEDs, Charges High-Voltage Batteries -  08/29/13  EDN-Design Notes The LT®3791 is a 4-switch synchronous buck-boost DC/DC converter that regulates both constant-current and constant-voltage at up to 98.5% efficiency with a single inductor.  It can deliver hundreds of watts and features a 60V input and output rating, making it ideal for driving high power LED strings and charging high voltage batteries when both step-up and step-down conversion is needed.  It can also be used as a constant voltage buck-boost regulator with current limiting and monitoring for both input and output.   __ Circuit Design by Keith Szolusha

LT6110-Cable/Wire Drop Compensator with LT1965 Linear Regulator -  Click Here For A Ready To Run LTspice Circuit Demonstration The LT®6110 is a precision high side current sense with a current mode output, designed for controlling the output voltage of an adjustable power supply or voltage regulator.  This can be used to compensate for drops in voltage at a remote load due to resistance __ Linear Technology/Analog Devices App Note, Greg Zimmer Oct 17th 2013

LTC Design Note 512: 65V 500mA step-down converter fits automotive & industrial applications -  05/31/14  EDN-Design Ideas This switcher is happy to drop a 60V input all the way down to 0.8V.  The trend in automobiles and industrial systems is to replace mechanical functions with electronics, thus multiplying the number of microcontrollers, signal processors, sensors, and other electronic devices throughout.  The issue is that 24V truck electrical systems and industrial equipment use relatively high voltages for motors and solenoids while the microcontrollers and other electronics require much lower voltages.  As a result, there is a clear need for compact, high efficiency step-down converters that can produce very low voltages from the high input voltages __ Circuit Design by Charlie Zhao

LTC Design Note: 55V High efficiency buck-boost power manager & multi-chemistry battery charger -  EDN-Design Ideas 01/01/2016    A versatile, efficient, multi-chemistry battery charger design operates in buck & boost modes. __ Circuit Design 

LTC Design Note: 6A Monolithic synchronous DC/DC step-down converter with digital power system management -  EDN-Design Ideas 01/02/2017    Efficient 6A buck sports PMBus configuration and monitoring __ Circuit Design 

LTC Design Note: Control the voltage of a remote load over any length of copper wire -  EDN-Design Ideas 08/31/2015    Read about how a unique component compensates for DC conductor loss without using extra sense wires __ Circuit Design 

LTC Design Note: High performance single phase DC/DC controller with power system management -  EDN-Design Ideas 09/24/2014     This DC-DC controller incorporates power system management and high-precision data converters __ Circuit Design by Yi Sun

LTC Design Note: Increasing output voltage & current range using series-connected isolated μModule converters -  EDN-Design Ideas 10/02/2015    Stack isolated converters to increase output voltage __ Circuit Design 

LTC Design Note: Inverting DC/DC controller converts a positive input to a negative output with a single inductor -  EDN-Design Ideas 02/27/2015    Generate negative voltages to -150V from a positive input __ Circuit Design 

LTC1645 Dual Channel Hot Swap Controller/Power Sequencer -  DN217 Design Notes__ Linear Technology/Analog Devices

LTC1646: Power Supply Isolation Controller Simplifies Hot Swapping the CompactPCI Bus for 5V-/3.3V-Only Applications -  DN253 Design Notes__ Linear Technology/Analog Devices

LTC2974 Demonstration Video -  The LTC2974 is a quad, digital power-supply monitor, supervisor, sequencer, and margin controller.  Supervisory functions include over and under threshold limits for current, voltage and temperature on four output channels as well as OV/UV threshold limits for a single input channel.  Programmable fault response allows the power __ Linear Technology/Analog Devices App Note, Mar 13th 2013

LTC2974 Quad Power System Manager with EEPROM (Digital Power Manager) Video Product Brief -  The LTC®2974 is a quad, digital power-supply monitor, supervisor, sequencer, and margin controller.  Supervisory functions include over and under threshold limits for current, voltage and temperature on four output channels as well as OV/UV threshold limits for a single input channel.  Programmable fault response allows the __ Linear Technology/Analog Devices App Note, Chris Gobok-Product Marketing Engineer Jan 22, 2013

LTC2991 Octal I2C Voltage, Current & Temperature Monitor-Video Product Brief -  The LTC®2991 is used to monitor system temperatures, voltages and currents.  Through the I2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors.  Additional measurements include internal temperature __ Linear Technology/Analog Devices App Note, Chris Gobok-Product Marketing Engineer Sep 13th 2011

LTC4151 Interfaces with Isolation Barrier in-48V ATCA Application -  For negative applications, VIN is measured with respect to the GND pin and the GND pin does not have to be at 0V.  The I2C isolation is required since the I2C pins are also referenced to the GND pin.  For OV and UV, ADIN could be used to measure a voltage between 0V and 2.048V, and the value can be compared to an OV and/or UV threshold in the microcontroller (stored in register) to determine if there is a fault.  Note__ Linear Technology/Analog Devices App Note, Jan 19th 2011

LTC422 μTCA Application Supplying 12V Power to Two μTCA Slots -  The LTC4225 offers ideal diode and Hot Swap functions for two power rails by controlling external series connected N-channel MOSFETs.  MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area.  Hot Swap control MOSFETs allow boards to be safely inserted__ Linear Technology/Analog Devices App Note, Apr 22, 2011

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