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Buck/Boost  / Step Up/Step Down Power Supplies
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Last Updated: December 31, 2017 06:44 AM


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8 Switcher Powers High-Performance µPs-  04/13/95 EDN Design Ideas:  The circuit in Fig 1  delivers 8A for driving as many as two of today's high-performance, high-speed µPs.  You can also optimize the design for lower current by changing a few components.  Most systems use a low-current 12V bias supply and a poorly regulated high-current 5V to power the logic.  However, __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Add a signal-strength display to an FM receiver IC-  09/05/02  EDN Design Ideas:  The Philips (www.  semiconductors.  philips.  co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output.  External components include one tunable LC circuit for the local oscillator, a few capacito __ Circuit Design by José Miguel-López, RF Center Ltd, Barcelona, Spain

8 Switcher Powers High-Performance µPs-  04/13/95 EDN Design Ideas:  The circuit in Fig 1  delivers 8A for driving as many as two of today's high-performance, high-speed µPs.  You can also optimize the design for lower current by changing a few components.  Most systems use a low-current 12V bias supply and a poorly regulated high-current 5V to power the logic.  However, __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Add a signal-strength display to an FM receiver IC-  09/05/02  EDN Design Ideas:  The Philips (www.  semiconductors.  philips.  co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output.  External components include one tunable LC circuit for the local oscillator, a few capacito __ Circuit Design by José Miguel-López, RF Center Ltd, Barcelona, Spain

Add an auxiliary voltage to a buck regulator-  31-Oct-02 EDN Design Ideas:  You often need more than one regulated output voltage in a system.  A frequently used and reasonably simple way to create this auxiliary output voltage is to add a second winding to the output inductor, creating a coupled inductor or a transformer, followed by a diode to rectify (peak-detect] this output voltage __ Circuit Design by John Betten, Texas Instruments, 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

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

Buck converter charger also provides system power-  11/16/96 Literature Number: SNVA532Switching Regulator providescharge 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 isbest choice because of high capacity and relatively low cost.  The battery charges __ Designed by Application Note Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Buck Mode Switching Regulator for Solar Applications-  The purpose of a voltage regulator circuit is to take a variable input voltage and produce a steady output voltage.  Two common regulator types are linear and switch-mode.  Linear regulators are simple, but waste a lot of power in the process of regulating the voltage.  Linear regulators can be thought of as self adjusting series resistors.  Switch-mode regulators such as this one are much more efficient.  Switch-mode regulators convert DC input voltages to pulses of high voltage DC.  The DC pulses are used to charge a storage capacitor to the desired output voltage.  The voltage is regulated by varying the width of the DC pulse __ Designed by G. Forrest Cook

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/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 Converter In SuperCap Backup Power Supply-  The LTC3536 is an extended VIN range, fixed frequency, synchronous buck-boost DC/DC converter that operates from input voltages above, below or equal to the regulated output voltage.  The topology incorporated in the LTC3536 provides low noise operation, making it ideal for RF and precision measurement applications __ Designed by Linear Technology/Analog Devices App Note, Aug 8, 2011

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

Constant-on-time buck-boost regulator converts a positive input to a negative output-  7-Dec-04 EDN Design Ideas:  Buck regulators find wide application as step-down regulators for converting large positive input voltages into a smaller positive output voltages.  Figure 1 shows a simplified buck regulator that operates in continuous-conduction mode—that is, the inductor current always remains positive.  The output voltage, VOUT, is equal to D×VIN, where D is the duty-cycle ratio of the buck switc __ Circuit Design by Robert Bell, National Semiconductor Inc, Chandler, AZ

Critical-mode control stabilizes switch-mode power supplies-  04/23/98 EDN Design Ideas:  Discontinuous-conduction-mode operation eases switch-mode power-supply design and allows for better response to step-load changes.  Operating at the critical-conduction point--beginning a new cycle at the exact point the inductor current falls to zero--ensures that the converter stays in discontinuous-conduction mode. __ Circuit Design by Christophe Basso, Motorola Semiconductors

Design Notes: Dual controller provides 2μs step response & 92% efficiency for 1.5V rails-  12/29/13  EDN-Design Notes Use a heated diode as a flow sensor. The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency, and low duty cycle capability.  The switching frequency range is 200kHz to 2MHz—its phase-locked loop keeps the frequency constant during steady-state operation and can be synchronized to an external clock.  The LTC3838 accepts a wide input range, 4.5V to 38V, and can produce 0.6V to 5.5V outputs. __ Circuit Design by Linear Technology Design Note 505

Discrete component buck converter drives HB LEDs-  03/05/09  EDN Design Ideas:  With just a few components, you can provide sufficient power to operate a high-brightness LED from a battery __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Dual controller provides 2μs step response & 92% efficiency for 1.5V rails-  12/29/13  EDN-Design Notes Use a heated diode as a flow sensor. The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency, and low duty cycle capability.  The switching frequency range is 200kHz to 2MHz—its phase-locked loop keeps the frequency constant during steady-state operation and can be synchronized to an external clock.  The LTC3838 accepts a wide input range, 4.5V to 38V, and can produce 0.6V to 5.5V outputs. __ Circuit Design by Mike Shriver

Eight Switcher Powers High-Performance µPs-  04/13/95 EDN Design Ideas:  The circuit in Fig 1  delivers 8A for driving as many as two of today's high-performance, high-speed µPs.  You can also optimize the design for lower current by changing a few components.  Most systems use a low-current 12V bias supply and a poorly regulated high-current 5V to power the logic.  However, __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Get buck-boost performance from a boost regulator-  07/11/02 EDN Design Ideas:  The SEPIC (single-ended, primary-inductance-converter] topology is generally a good choice for voltage regulators that must produce an on output voltage that falls in the middle of the input-voltage range, such as a 5V output from a 2.7 to 6V input, The topology has some disadvantages, however.  The efficiency of a SEPIC circuit fares worse than that of buck and boost regulators, and SEPIC desig __ Circuit Design by Tom Gross, Linear Technology Corp, Milpitas, CA

Industry’s First 4-Switch Buck/Boost Controller Achieves Highest Efficiency using a Single Inductor-  DN369 Design Notes__ Linear Technology/Analog Devices

LDO Buck/Boost 2 Sync Buck Sync Boost Reference Design-  LDO, Buck/Boost, 2 Sync.  Buck, Sync.  Boost with Vin 2.7-4.2 V LiION or 4.5-6.5 V adapter.  Multiple output voltages of 1.5 V, 2.5 V, 3.3  V and 8 V.  The total output power is 5.5 W. __

Li'l PowerHouse Switchmode Power Supply-  This highly efficient design can deliver from 1.23V to 40V at currents up to 1.2A.__ SiliconChip

Li'l PowerHouse Switchmode Power Supply; Pt.2-  Second article has all the construction details.  And we've improved the output filtering for even better performance.__ SiliconChip

LTC1626: Step-Down Converter Operates from Single Li-ION Cell-  DN196 Design Notes__ Linear Technology/Analog Devices

Micropower Buck/Boosts Part 1: Converting Three Cells to 3.3V*-  DN109 Design Notes__ Linear Technology/Analog Devices

Micropower Buck/Boosts Part 2: Converting Four Cells to 5V*-  DN110 Design Notes __ Linear Technology/Analog Devices

Negative-To-Negative Switch-Mode Converter Offers High Current & High Efficiency-  11/12/09  EDN Design Ideas:  Don't let variations in input voltage affect the output voltage __ Circuit Design by Budge Ing, Maxim Integrated Products Inc, Sunnyvale, CA

No Design Switiching Regulator 5V Buck/Boost Positive to Negative Regulator-  DN49 Design Notes__ Linear Technology/Analog Devices

Single Inductor Tiny Buck/Boost Converter Provides 95% Efficiency in Lithium-Ion to 3.3V Applications-  DN275 Design Notes__ Linear Technology/Analog Devices

Spreadsheet simplifies switch-mode power-supply flyback-transformer Design-  EDN  Design Ideas - 03/14/1997  Designing flyback transformers for switch-mode power supplies involves many calculations.  A spreadsheet can make short work of this otherwise-tedious task. __ Circuit Design by Brooks Leman, Power Integrations

Starpower-A Switching Supply for Luxeon Star LEDs-  It's based on a switching regulator ic, runs of 12V and is just the shot for powering 1-5W Luxeon Star LEDs.__ SiliconChip

Step up/step-down current-source charges batteries-  06/06/96  EDN Design Ideas:  For battery charging, the highly efficient step-down (buck] configuration is usually the topology of choice.  However, a different approach is necessary if the following conditions prevail. The supply voltage is less than the battery __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Step-Down Converter Operates from Single Li-ION Cell-  DN196 Design Notes__ Linear Technology/Analog Devices

Switchmode Constant Current Source-  Operating a stepper motor using a fixed (constant) voltage supply results in poor torque at high speeds.  In fact, stepper motors tend to stall at fairly low speeds under such conditions.  Several approaches can be used to overcome this problem, one of which is to use a constant current supply in place of the more__

Switchmode converter 70W input:10-16VDC Output:200-300VDC-  Simple Switch mode up-converter is normaly called inverters. Input voltage 10-16 Volt, Output 200-300 Volt DC 70 W.  Uses UC1825 from Unitrode, and two IRF540 to drive the push-pull transformer. __ Designed by Thomas Scherrer OZ2CPU

Switchmode converter 800W & Audio Amp.-  The converter uses an UC1825 from Unitrode, this IC drives two HUGE and powerfull MOS-FETS IRFP150.  Input voltage 11 to 16 volt, input current max load 70 A.  Output voltages +30 and -30 balanced __ Designed by Thomas Scherrer OZ2CPU

Synchronous Buck/Boost High Power White LED Driver-  LT3453__ Linear Technology/Analog Devices

Video Design Idea: 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/Boost  / Step Up/Step Down Power Supplies


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