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Saturable Bead Improves Reverse Recovery - 02/03/97 EDN-Design
Ideas....The circuit in Figure 1 uses current-feedback amplifiers to
implement a wideband full-wave rectifier for applications such as a control/AGC
system reference or as an amplitude indicator. Putting the
full-wave-rectifier diodes in the feedback.... [Design Idea by Ronald
Mancini, Harris Semiconductor, Melbourne, FL] |
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Selecting the best inductor for your DC-DC converter - Coilcraft
Power Magnetics Application Note (app note added 6/06) |
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SEPIC generates 5V at 100 mA - 05/03/01 EDN-Design Ideas..../ PDF
contains multiple circuits, scroll to find the one of interest / Some
applications require an input voltage higher than the breakdown voltage of
the IC supply pin. In boost converters and SEPICs (single-ende.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Serial Interface IC Supplies BiPolar Voltages - 07/06/95 EDN-Design
Ideas.... [Design Idea by Gary Sellani, Maxim Integrated Products,
Sunnyvale, CA] |
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Signal transformer application - Coilcraft Power Magnetics
Application Note (app note added 6/06) |
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Simple +5V Power Supply circuit - (electronic circuit added 4/05)
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Simple circuit converts 5V to –10V - 26-May-05 Issue of EDN
Switched-capacitor circuit doubles, inverts dc source.... [Design Idea by Ken Yang,
Maxim Integrated Products Inc, Sunnyvale, CA; Edited by Brad Thompson] |
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Simple Circuit replaces & Improves on Power Modules at Less Than Half the Price -
DN347 Design Notes (Linear Technology) (app note added 1/06) |
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Simple DC Adapter Power Supply - You need a power supply for a project, but
only have a DC adapter available, so you can't use my AC power adapter trick (Project
05). This little project came about because a reader had just this problem, and didn't
know what he could do. This idea will work best with DC adapters having 12V DC or more
- lower voltages will work, but the dynamic range will not be as good as it could
be.... [Rod Elliot (ESP)] |
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Simple dc/dc converter increases available power in dual voltage system -
8-Jan-04 Issue of EDN The schematic in Figure 1 shows a way to increase the
power available from a current-limited 5V supply by adding power from a -5V supply.
The dc/dc converter generates a single 12V, 150-mA (1.8W] output from two regulated
and current-limited input sources at 5V, 300 mA (1.5W] and -5V, 300 mA (1.5W]....
[Design Idea by David Kim, Linear Technology, Milpitas, CA] |
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Simple High Efficiency Isolated Flyback Supply Without Optoisolator - DN1011
Design Notes (Linear Technology) (app note added 1/06) |
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Simple Method to Reduce DC Power Consumption in CDMRF Power Amplifiers Through the
LMV225 & an Efficient Switcher - National Semiconductor Application Note
(app note added 2/06) |
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Simple power supply fits into small spaces - 13-Nov-03 Issue of EDN
The demand for negative-voltage power supplies is increasing with the popularity of
applications for portable devices. It can be expensive and relatively complicated to
generate a negative supply from a positive input source, especially when the design
requires both positive and negative outputs. Figure 1 shows a simple and
cost-effective solution that combines a voltage inverter and a voltage.... [Design
Idea by Raymond Zheng, Linear Technology, Milpitas, CA] |
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Simple Regulator has one Active Part - 03/16/95 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Search the "title" + "EDN" for new
link. |
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Simple Regulator Provides ±12V - 10/23/97 EDN Design Idea Simple
circuit can provide ±12V from a5V input using only one switching-regulator IC and a
few off-the-shelf [Design Idea by Musiri Shrivathsan, National Semiconductor Corp,
Santa Clara, CA] |
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Simple step-up converter (6V to 12V) - ….(electronic schematic added 08/08)
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Single cell flashes white LED - 11-Dec-03 Issue of EDN Many portable
appliances and other products that must operate from a single cell are restricted to
working at very low voltages. It is thus difficult to drive white LEDs that typically
have a forward voltage of 3 to 5V. The ability to flash the LED with a supply voltage
as low as 1V presents additional complications.... [Design Idea by Anthony Smith,
Scitech, Biddenham, Bedfordshire, UK] |
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Single cell lights any LED - 5-Jul-01 Issue of EDN The circuit in
Figure 1 allows you to light any type of LED from a single cell whose voltage ranges
from 1 to 1.5V. This range accommodates alkaline, carbon-zinc, NiCd, or NiMH
single cells. The circuit's principal application is in LED-based flashlights, such as
a red LED in an astronomer's flashlight, which doesn't interfere with night vision....
[Design Idea by Al Dutcher, Al Labs, West Deptford, NJ] |
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Single IC Biases LCD and GaAsFET Amplifier - 04/09/98 EDN-Design
Ideas....Operating from a lithium-ion cell or a four-cell NiCd battery, the circuit in
Figure 1 provides �6V bias for LCDs and a separate, quiet negative bias for a
GaAsFET power amplifier. This bias combination exists in cell
phones,....contains several circuits, scroll to this one.... [Design Idea by John
Wettroth, Maxim Integrated Products, Apex, NC] |
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Single LTC1149 Delivers 3.3V & 5V at 17W - DN72 Design Notes (Linear
Technology) (app note added 1/06) |
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Single NiCd Cell Drives OpAmp - 12/05/96 EDN-Design Ideas.Low-supply-voltage
op amps, such as the LMC6582 and LMC6681 families, feature rail-to-rail I/O with a
gain-bandwidth product greater than 1 MHz operating from just 1.8V. Although
impressive, this voltage is not low enough to power these amps using a single alkaline
or NiCd/NiMH cell, which have typical voltages of 1.25 to 1.5V. It is rather tempting
to bridge this gap by designing a dc/dc converter.... [Design Idea by Alexander
Belousov, Rego Park, NY] |
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Single Resistor Improves V2 Converter - 08/15/97 EDN-Design Ideas....
Step-down switching regulators commonly provide myriad digital-circuit voltages that
range from traditional logic voltages of 5 and 3.3V to processor-core voltages of 1.8V
and below. The main advantage of these regulators.... [Design Idea by Dimitry Goder,
Switch Power Inc, San Jose, CA] |
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Small DC to DC converters - Small DC to DC converters of the type used to
generate supplememtary voltages on circuit boards…. [Reverse engineered schematic by
Stepan Novotill] |
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Small FM transmitter SMD - (electronic design added 6/07) |
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Soft Start power Supply - Circuit designed by Miroslav Adzic. The output
voltage rises slowly and reaches 15 V in 5 seconds. In order to perform this
soft-start function, the LM317 voltage regulator IC requires an external universal PNP
transistor and the L200 uses its internal comparator (pin 2). After switch-on,
the rising voltage on the positive side of the charging electrolytic....(added 10/05)
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Solar Cell Converter offers Positive Start up - 08/15/96 EDN-Design
Ideas....Applications deriving power from solar cells often require a 5V power supply.
However, the cells typically provide a terminal voltage of only 0.8 to 1.4V with
current capacity of 3 to 4A. Most dc/dc converters can neither start with such low
voltages, nor can they start under full-load conditions. The two-IC approach....
[Design Idea by Robert Badalian, Maxim Integrated Products, Sunnyvale, CA] |
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Soldering surface mount components - Coilcraft Power Magnetics Application
Note (app note added 6/06) |
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Some Thoughts on DC/DC Converters - AN29 Linear TechnologyThis note examines
a wide range of DC/DC converter applications. Single inductor, transformer, and
switched-capacitor converter designs are shown. Special topics like low noise, high
efficiency, low quiescent current, high voltage, and wide-input voltage range
converters are covered. Appended sections explain some fundamental properties of
different types of converters. |
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SOT-23 DC/DC Converters Generate Up to ±35V Outputs & Consume Only 20µA of Quiescent
Current - DN223 Design Notes (Linear Technology) (app note added 2/06)
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Split Supply for Op-Amps - (circuit added 07/07/07) |
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Stability & Transient Analysis of the Miller-Compensated Linear Regulators on the
ADP3178 - AN-593 Analog Devices Application Note....[App Note] |
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Startup & Over-shoot Design Solutions-MP1580-DN0002 - Monolithic Power
Systems, Inc Design Note (added 6/06) |
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Step-up/step-down converter takes 2 to 16V inputs - 07/16/98 EDN-Design
Ideas....The circuit in Figure 1 is a low-cost step-up/step-down dc/dc
converter. By definition, its input can range above and below the regulated voltage.
The circuit includes a simple switchmode boost converter (IC1] that contains a
comparator normally used to detect low battery voltagenThis file contains several
circuits, scoll to find this one.... [Design Idea by Lucian Brodogna and Luca
Vasalli. Maximin Integrated Products, Milan Italy] |
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Step-Up/Step-Down DC/DC Conversion Without Inductors - DN189 Design
Notes (Linear Technology) (app note added 2/06) |
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Stresses in Wide Input DC-DC Converters - National Semiconductor Application
Note (app note added 2/06) |
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Student DC Power Supply - Build a simple DC supply having threeoutput
terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC. The supplyis suitable for
microcontroller experimenting. [Wichit Sirichote, kswichit@kmitl.ac.th] |
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Super wide bandwidth power splitters ZN2PD2-50, ZN4PD1-50 - N-10-003
Application Note MiniCircuits.com (app note added 04/05/06) |
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Supply converts 5V to 48V - 11/24/99 EDN-Design Ideas EDN is migrating
links. This link is not verified. Search the "title" + "EDN" for new link.
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Supply derives 5 and 3.3V from USB port - 20-Dec-01 Issue of EDN The
circuit in Figure 1 derives its power from a USB port and produces 5 and 3.3V supply
rails for portable devices, such as digital cameras, MP3 players, and PDAs. The
circuit allows the port to maintain communications while, for example, charging a
lithium-ion battery. IC2 boosts the battery voltage, VBATT, to 5V, and IC3
buck-regulates that 5V output down to 3.... [Design Idea by Chad Olson, Maxim
Integrated Products, Sunnyvale, CA] |
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Supply uses ac to generate 5V, power on reset - 16-May-02 Issue of EDN
The need often arises for a low-cost logic supply for powering microcontrollers and
related circuitry in "white-goods" products, such as industrial controllers and
sensors. These applications usually include 24 or 115V ac or higher levels of ac
voltage for conversion to 3.3 or 5V dc. The simplest approach to generating
low-current logic-supply levels is to apply the rectified and filtered ac in....
[Design Idea by Greg Sutterlin, Maxim Integrated Products, Sunnyvale, CA] |
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Supply Voltage Indicator - Circuit designed by Miroslav Adzic. This simple
and slightly odd circuit can clearly show the level of the supply voltage (in a larger
device): as long as the indicator has good 12 volts at its input, LED1 gives steady,
uninterrupted (for the naked eye) yellow light. If the input voltage falls below 11 V,
LED1 will start to blink and the blinking will just get slower and slower if the
voltage.... [Miroslav Adzic - Serbia & Montenegro] |
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Supporting Legacy 5 V SIM Cards with the ADP3408 & ADP3522 - AN-678 Analog
Devices Application Note (app note added 2/06) |
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Switched-Capacitor Integrator - we can strap this circuit onto the front end
of an opamp to create the basic building block of many filter circuits the integrator.
However, the major obstacle to happy filtering is the mine field of stray capacitance.
These uncontrolled strays can add significant capacitance to the switched capacitor,
destroying the accuracy of your desired filter....(electronic schematic design added
02/05) |
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Switched-Capacitor Low Pass Filters for Anti-Aliasing Applications - DN16
Design Notes (Linear Technology) (app note added 1/06) |
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Switched-capacitor regulator provides gain - 03/13/98 EDN-Design
Ideas....Linear voltage regulators become inefficient when the input voltage is much
higher than the regulated output. The circuit in Figure 1 dramatically increases
efficiency when the input voltage is more than twice the desired output; for example,
using 12V to obtain a regulated 3.3 or 5V....PDF contains multiple circuits scroll to
find this circuit.... [Design Idea by Jeff Witt, Linear Technology Corp, Milpitas, CA] |
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Switching solenoid Driver - (electronic circuit added 4/05) |
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Switch-mode Power Supply for a Tube Car Amplifier - To minimize heat loss on
any transistor, I use two pass FETs. In the car, input voltage is either 11.5-12.5V
(engine off) or 13.5-14.5V (engine on). In the first case, T1 and T2 are fully ON, no
need for heatsink. In the second case, T1 is OFF, T2 ON, all voltage and power
excess....(design idea added 04/05/06) |
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Switch-mode supply draws 43 mW standby power - 06/10/99 EDN-Design Ideas
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Synchronized Regulator Produces Coherent Noise - 03/17/94 EDN-Design
Ideas....By using a gated-oscillator architecture instead of a clocked-PWM one,
gated-oscillator-type switching regulators permit high efficiency over extended ranges
of output current. This architecture eliminates the housekeeping currents
associated with the continuous operation of fixed-frequency.... EDN is migrating
links. This link is not verified. Search the "title" + "EDN" for new link.
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Synchronous buck circuit produces negative voltage - 6-Mar-03 Issue of EDN
Many electronic systems require both positive and negative voltages to operate
properly. Generating an efficient, low-voltage positive output from a higher voltage
input typically entails the use of a synchronous buck regulator. But when generating a
negative output voltage from a positive input voltage, you'd typically use a flyback
topology, especially at higher output currents.... [Design Idea by John Betten, Texas
Instruments, Dallas, TX] |
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Synchronous flyback circuit provides high-efficiency conversion - 22-Jul-04
Issue of EDN Buck regulators are usually the first choice when you design
nonisolated step-down regulators unless the ratio of VIN to VOUT is greater than 10,
the input voltage is high, or both. Low duty cycle can be problematic for FET drivers
and cause current-mode control loops to lose control. Efficiency can fall dramatically
to 60 to 70% at low VOUT and current of only a few amps.... [Design Idea by Wayne
Rewinkel, National Semiconductor, Phoenix, AZ] |
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System Oriented DC-to-DC Conversion Techniques - National Semiconductor
Application Note 01 May1998 (app note added 7/02) |
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