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Boost / Step Up Power Supplies
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Battery Booster Delivers 75W-  07/16/98 EDN Design Ideas:  (  FILE has several circuit ideas.  Scroll to find this one.) The circuit in Figure 1defies no laws of physics; it just makes creative use of an isolated DC/DC converter.  The application uses the isolated converter in a nonisolated configuration to boost a 48V battery voltage to 60V.  The __ Circuit Design by Donald V Comiskey, Power Trends Inc, Warrenville, IL

Bipolar transistor boosts switcher's current by 12 times-  05/24/01 EDN Design Ideas:  The circuit in Figure 1 uses a minimal number of external parts to raise the maximum output current of a 0.5A buck switching-regulator IC to more than 6A.  The circuit accommodates input voltages of 15 to 60V and delivers output voltages of 3.3, 5, or 12V, depending on your choice of ICPDf has several circuits, scroll to find this one __ Circuit Design by Wayne Rewinkel, National Semiconductor Corp, Santa Clara, CA

Boost 3.3V to 5V with tiny audio Amplifier-  09/05/02 EDN-Design Ideas This charge-pump circuit quietly converts a 3.3V source to 5V at 500 mA (figures 1 and 2].  National's (www.national.com] LM4871LD power amplifier makes This design idea both possible and practical, thanks to its low output resistance, low cost, compact size, and high dissipation capability.  Its output resistance has an average value of 0 __ Circuit Design by Wayne Rewinkel, National Semiconductor, Santa Clara, CA

Boost Controller Drives Buck Converter-  02/03/97 EDN Design Ideas:  By adding an external Switching Transistor, you can use a step up DC/DC Converter to step down voltages to produce an efficient Battery Powered Power Supply, this example Circuit can step down inputs as Low as2V to Outputs as Low as1.25V, with efficiency as high as 80% __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Boost converter controls 12V fan from 5V supply-  12/12/97 EDN Design Ideas:  Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply. __ Circuit Design by John McNeill, Worcester Polytechnic Institute, Worcester, MA

Boost Converter for Solar Cell Array-  The boost converter is used to charge batteries from low voltage solar  arrays.  Results were obtained using 3X3 cells that deliver about 400  millivolts at 1 amp.  The pictured panel array contains 20 cells in series  and generates about 8 watts at 8 volts in bright sunlight and was assembled  on a 12 X 16 picture frame.  Efficiency of the converter measured 87% and  delivers almost 600 milliamps into a 12 volt SLA battery.  Efficiency drops  to about 72% using 4 single cells in series (pictured above) charging the  same 12 volt battery at around 70mA. __ Designed by Bill Bowden

Boost Converter Generates 3 Analog Rails-  App Note #2026 In Figure 1, a standard boost converter consisting of IC1, C1, L1, D1, and C2 generates, in addition to main output, two auxiliary supply rails (10V and -5V) withaddition of some small and very low-cost extra components__ Maxim Integrated

Boost converter generates-27 and-87V-  05/22/97 EDN Design Ideas:  In modern telecommunications applications, the basic communications link to the home is becoming either digital or wireless.  The normal circuitry to control a telephone is moving from the central office to the home.  Subscriber-li __ Circuit Design by David Feller, Harris Semiconductor, Dallas, TX

Boost converter works with wide-range negative-Input supply-  18-Mar-04 EDN Design Ideas:  Assume that a design requires positive voltage, but only a negative-voltage power source is available.  Using a standard boost-converter IC in the circuit of Figure 1, you can efficiently generate a positive voltage from a negative source.  The boost converter generates an output voltage that's higher than the input voltage __ Circuit Design by Mike Wong, Intersil Corp, Milpitas, CA

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

Boost Voltage to Piezoelectric Transducers-  06/09/11  EDN Design Ideas:  Drive a piezo device at maximum power and and its resonant frequency.  Piezoelectric transducers are common in ultrasonic and acoustic-alarm-signaling applications.  To get enough acoustic power from a piezoelectric transducer, you must power the device with a frequency at or near its resonant frequency.  Furthermore, the driving voltage should be as high as the transducer allows. __ Circuit Design by Kurt Nell, Sankt Pölten, Austria

Booster enables reliable solenoid operation-  EDN Design Ideas:  10/30/2012  Rather than increase the power supply voltage and current capability, this workaround uses a momentary voltage boost to turn on a solenoid __ Circuit Design by Shankar Nakhe

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

Bootstrapped Boost Converter operates at 1.8 Volt -  04/23/98 EDN Design Ideas:    NOTE: File contains multiple circuits scroll to find this circuit. Many circuits, such as those that use batteries or solar cells, must operate in the face of decreasing supply voltages.  The circuit in Figure 1  maintains the maximum load current as the supply voltage drops.  The regulator boosts a 2.5 to 4.2V input to 5V __ Circuit Design by Tom Gross, Linear Technology, Milpitas, CA

Bootstrapped Timer-  This circuit demonstrates how to use bootstrapping to seriously boost output power of timer.  The LC555 can only put out about 50mA as it is.  This circuit can put out at least 200mA and goes torail as well.  The LM555 timer puts out 300mA max, but does __ Designed by Andrew R. Morris

Buck Converter Handles Battery-Backup System-  04/24/03  EDN Design Ideas:  Circuit forms gamma-photon detector - A synchronous buck converter is inherently bidirectional.  That is, it transfers energy from input to output as a buck regulator when the output voltage is low, but, when the output voltage is high, the converter acts as a boost regulator, transferring power from output to input.  This design idea shows how to use this bidirectional energy transfer to automatically recharge a battery when the mai __ Circuit Design by Haresh Patel, Linear Technology Corp, Milpitas, CA

Buck IC Boosts Battery Voltage for White LED-  04/24/03  EDN Design Ideas:  White-light LEDs are finding their way into many markets that incandescent bulbs once served.  Flashlights are among the newer applications in which reliability, ruggedness, and ability to control the power draw of the LEDs make these devices attractive.  With incandescent bulbs, the power management for the device is a simple on-off switch __ Circuit Design by Robert Kollman, Texas Instruments, Dallas, TX

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

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

Build a charge pump with ultralow quiescent current-  5-Aug-04 EDN Design Ideas:  Portable battery-powered devices often spend most of their life in standby mode, in which the quiescent current of an internal boost converter continuously bleeds the battery.  The quiescent current during standby can be larger than the actual load current.  Though several inductor-based converters offer maximum quiescent current of less than 10 µA, designers usually prefer or require a regu __ Circuit Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA

Cascaded converter boosts LED-drive capability-  08/16/07 EDN Design Ideas:  A two-stage boost converter can drive a string of 20 to 30 LEDs __ Circuit Design by Grant Smith, National Semiconductor, Phoenix, AZ

Cascode MOSFET increases boost regulator's input- & output-voltage ranges-  09/01/05 EDN Design Ideas:  Simple enhancement extends range of both sIde as of regulator __ Circuit Design by Scot Lester, Texas Instruments, Dallas, TX

Charge Pump & Step Up DC DC Converter Solutions for Powering White LEDs in Series or Parallel Connections-  App Note #1037__ Maxim Integrated

Charge pump with ultraLow quiescent current-  08/05/04  EDN Design Ideas:  Portable battery-powered devices often spend most of their life in standby mode, in which the quiescent current of an internal boost converter continuously bleeds the battery.  The quiescent current during standby can be larger than __ Circuit Design by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA

Circuit Boosts Voltage to Piezoelectric Transducers-  06/09/11  EDN Design Ideas:  Drive a piezo device at maximum power and and its resonant frequency.  Piezoelectric transducers are common in ultrasonic and acoustic-alarm-signaling applications.  To get enough acoustic power from a piezoelectric transducer, you must power the device with a frequency at or near its resonant frequency.  Furthermore, the driving voltage should be as high as the transducer allows. __ Circuit Design by Kurt Nell, Sankt Pölten, Austria

Circuit breaker handles voltages to 32V-  25-May-00 EDN Design Ideas:  The simplicity of low-side current monitoring can mask the advantages of a high-side approach.  You can monitor load currents in a power supply, a motor driver, or another power circuit on either the high or the low side (ground].  However, don't let the ease of low-side monitoring cause you to overlook __ Circuit Design by Greg Sutterlin and Craig Gestler, Maxim Integrated Products, Sunnyvale, CA

Circuit Breaker Provides Overcurrent & Precise Overvoltage Protection-  7-Jun-07 EDN Design Ideas:  A simple circuit breaker delivers precision overvoltage protection and overcurrent protection __ Circuit Design by Anthony H Smith, Scitech, Bedfordshire, England

Circuit converts 5V to –10V-  26-May-05 EDN Design Ideas:  Switched-capacitor circuit doubles, inverts dc source __ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Coilless step-up converter yields dual outputs-  09/01/97 EDN Design Ideas:  Rapidly proliferating battery-powered systems create a need for dc/dc converters that can accommodate a wide input-supply range.  Depending on the battery-pack configuration, the input-supply voltage may be higher or lower than the desired regulated output voltage.  The circuit in Figure 1 provide as regulated 5 and 3V supplies from a wide input range without the need for inductors. __ Circuit Design by Sam Nork, Linear Technology Corp, Burlington, MA

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

Configure buck converter for boost operation-  12/17/98 EDN Design Ideas:  (File contains many circuits.  Scroll to find this one.) __ Circuit Design by Mehrzad Koohian, Semtech Corp, Newbury Park, CA

Controller IC & one-shot form resonant controller-  11/28/02 EDN Design Ideas:  Resonant power supplies are popular because of high efficiency, low noise, and compactness.  You can implement a resonant buck or boost converter using a single switch.  The regulation of the output in such a converter derives from using a constant on or off time and a variable frequency.  The UC1864 controller IC (Texas Instruments, www __ Circuit Design by C Rajan, Centre for Advanced Technology, Indore, India

Convert 5V to –10V-  05/26/05  EDN Design Ideas:  witched-capacitor circuit doubles, inverts dc source __ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA


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