+9 Volt*and* 9 Volt From One Battery!: The MAX1044 is a
charge pump converter - it uses a capacitor as a "bucket" to
pump charge from one place to another. It can be used to
generate negative voltage easily. |
10 to 30K Volt Flyback Power Supply: |
1118 Simple Regulator Provides �12 Volt From 5 Volt Source:
National Semiconductor Application Notes,31 Aug2001 |
1119 Voltage Doubler Design & Analysis: National
Semiconductor Application Notes,26 Jun2001 |
|
20 Watt Simple Switcher Forward Converter: National
Semiconductor Application Notes,01 May1998 |
3.3 Volt Converter Delivers 3 Watt From Li ion Battery:
11/05/98 EDN-Design Ideas |
3.3 Volt Lithiumcell Supply Requires one inductor: 08/05/99
EDN-Design Ideas / PDF contains multiple circuits - scroll to
find this circuit.
|
3.3 Volt Supply Taps Power From the12 Volt PCI Bus:
|
5 to 1.8 Volt Converter Works Without Magnetics: 04/13/00
EDN-Design Ideas / PDF contains multiple circuits - scroll to
find the one of interest / |
5 Volt DC From RS232 Signals: The circuit of Figure1
produces a semi-regulated5-Volt output from an RS-232 port.
Unlike a PC-mouse supply or comparable that rely on the
modem-control signals DTR and RTS, this one operates with
a3-wire port GND, Rx, and TX, and obtains power only from the TX
line. The output current-about 8mA-is sufficient for CMOS
microcontrollers and other low power. |
5 Volt Supply Derives Power From Three Wire RS232C Port:
10/26/95 EDN-Design Ideas |
6 to 12 Volt Converter: This circuit can provide up to 800mA
of12V power from a 6V supply. The circuit is simple, about 75%
efficient and quite useful. |
60 MCurrent Source Feeds Telecomm Lines: 12/18/97 EDN-Design
Ideas |
8Switcher Powers High Performance �Ps: 04/13/95 EDN-Design
Ideas |
Add Trimmable Current Limit to DC to DC Supply: 08/01/97 EDN-Design
Ideas / you can add a simple, two-transistor circuit to a
standard, step-down dc/dc converter to provide an adjustable
limit for the output current |
AutoTransformer Regulator Inverts 12 Volt to Produce �12V:
08/01/97 EDN Design Ideas / Produces Output of200 mA
|
Battery Backup Converter uses One NiCd Cell: 02/03/97 EDN
Design Ideas / This dc/dc Converter allows you to replace a five
or six unit string of NiCd coin Cells with one Cell |
Battery Booster Delivers 75W: 07/16/98 EDN Design Ideas /
Uses isolated DC/DC Converter in a nonisolated configuration to
boost a48V Battery voltage to 60 Volt |
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% |
Boost Converter Generates �27 & �87V: 05/22/97 EDN-Design
Ideas / Generates the voltage levels necessary for standard
telephones from12V |
Boost Converter Generates Three Analog Rails: 07/02/98 EDN-Design
Ideas |
Bootstrapped Boost Converter operates At 1.8 Volt : 04/23/98
EDN-Design Ideas |
Bootstrapping allows single rail op amp to provide 0V output:
02/06/03 EDN-Design Ideas / Many single-supply-powered
applications require amplifier-output swings within 1 mV—or even
submillivolts—of ground. Amplifier-output-saturation limitations
normally preclude such operation. Figure 1's power-supply
bootstrapping scheme achieves the desired characteristics with
minimal parts count |
Buck regulator and two inductors make dual polarity converter:
03/20/03 EDN-Design Ideas / A common problem for power-supply
designers is to create a compact, dual-polarity step-down
converter. If space and cost are not concerns, the obvious
solution is a pair of dc/dc converters, one for each output. But
space and cost are almost always issues for communications,
data-acquisition, and disk-drive applications... |
Buck Regulator Generates Flexible VTT for PECL: 08/15/97 EDN
Design Ideas / Circuit to generate Output which can both Source
and Sink Current |
Buck regulator operates without a dedicated clock :
08/21/03 EDN-Design Ideas / Most switching regulators rely on a
dedicated clock oscillator to determine the switching frequency
of operation. A dedicated oscillator circuit within the power
controller usually generates the clock signal. A class of
hysteretic switching regulators can actually operate at a
relatively fixed frequency without a clock, even with changing
input-line and output-loading conditions.... |
Buck Regulator Terminates Fast Data Buses: 07/20/95 EDN-Design
Ideas |
Buck Regulator uses Step up Controller: 11/09/95 EDN-Design
Ideas |
Capacitor Charger Improves High Voltage Supply: 12/19/96 EDN-Design
Ideas |
Capacitor improves efficiency in CPU supply: 04/04/2002 EDN
- Design Ideas / High efficiency is important for the dc/dc buck
converters that supply high currents in notebook PCs. This
efficiency extends battery life and minimizes temperature rise.
A low-dissipation synchronous rectifier using an external MOSET
provides this high efficiency. Synchronous rectifiers require
special attention, however. . |
Circuit Drives 9 Volt Solenoids From 3 Volt Battery:
08/17/95 EDN-Design Ideas |
Circuit Multiplexes Automotive Sensors: 01/20/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit. |
Circuit Provides 1.5V, 7Bus Termination: 09/14/95 EDN-Design
Ideas |
Circuit reduces negative voltage stresses on control IC:
04/18/2002 EDN - Design Ideas / In a synchronous, buck
switching power supply, the two FETS and the output inductor
meet at the phase node (Figure 1). The phase node often connects
directly to the control IC. The voltage on this node swings from
the input voltage to some voltage lower than ground. If the
voltage goes too far below ground, the ESD structures or other
circuitry within the control IC can become forward-bia... . |
Circuit Variations Produce Negative Voltages: 09/01/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find the one
of interest / This circuits easily configures basic
switched-capacitor converters to also do some negative
conversions
|
Clean Switcher Powers 16 Bit a / D Converters: 07/04/94 EDN-Design
Ideas |
Coilless Step up Converter yields Dual Outputs: 09/01/97 EDN-Design
Ideas |
Comparator Adds Current Limit to V2 Controller: 05/21/98 EDN-Design
Ideas |
Comparator Improves Regulator's Efficiency: 04/28/94 EDN-Design
Ideas |
Converter Generates 3.3 Volt From Two or Three Cells:
11/11/96 EDN-Design Ideas |
Converter has High Efficiency At Low Loads: 01/06/94 EDN-Design
Ideas / MicroPower components and circuit design of this
converter enable it to maintain 90% efficiency for load currents
below 8 mA, circuit outputs5V DC
|
CoolSET TDA16831: -34 for OFF-Line Switch Mode Power
Supplies |
Cuk Converter yields 90% Efficiency: 09/01/94 EDN-Design
Ideas |
Current Limit Protects Power Bus: 12/12/97 EDN-Design Ideas
/ Protects a power bus from a load short within a guaranteed2
�sec response Time
|
Current Source Forms unusually Simple Regulator: 09/12/97
EDN-Design Ideas / Simple regulator uses a switching current
source to drive a pair of shunt Zener regulators, circuit
produces �15V dual outputs, for total output power of
approximately400 mW form100-400-Volt DC source
|
DC to DC Controller Generates Negative Supply: 06/08/95 EDN
Design Ideas / a Switch mode Power Supply Controller plus a
diode capacitor network generate the modest negative Supply
Current needed for OpAmps or for LCD Bias, without inductors |
DC to
DC Converter Allows of Single Battery: Have you ever wanted
to circuit to run off a single 9 Volt battery only to find you
needed levels like +12 and -12 Volts? The thought of multiple
batteries might have put you off. Why not use a simple DC to DC
converter? |
DC to DC Converter operates From Phone Line: 11/09/00 EDN
Design Ideas / PDF contains multiple circuits - scroll to find
this circuit |
DC to DC Converter: will produce a 85-Volt voltage from +3V,
usable for low power applications |
DC/DC Conversion Without Inductors: Maxim Application Note
#725 |
Designing a Multi Phase Asynchronous Buck Regulator using the
LM2639: National Semiconductor Application Notes,27 Mar2000
|
Drive High Voltage Varactor Diodes From just 5V: 03/27/97
EDN-Design Ideas |
Easy Xenon DC to DC Converters!: |
Flyback Circuit Provides Isolated Power Conversion: 01/07/99
EDN-Design Ideas / PDF contains multiple circuits - scroll to
find this circuit.
|
Half Bridge Inverter has Variable Frequency: 10/09/97 EDN-Design
Ideas |
Handy tool Troubleshoots Feedback Loops: 04/10/97 EDN-Design
Ideas |
Hex Inverter Makes Low Cost Switching Regulator: 05/23/96
EDN-Design Ideas / Simple and low-cost circuit converts5V to12V
|
IC & Capacitor Improve Isolated Supply: 09/01/97 EDN-Design
Ideas |
Ignition Coil / Flyback Transformer Based High Voltage
Generators: This page gives my thoughts on how to use a car
ignition coil or Flyback transformer as a high voltage
generator. The objective is to produce as high a voltage as
possible, with as high a power throughput as possible. |
Inverter Forms High Efficiency Rail Splitter: 08/01/97 EDN-Design
Ideas / switched-capacitor voltage inverter can be used as "rail
splitter" to provide bipolar, dual-rail power supply
|
Isolated Signal Trims DC / DC Converter: 09/01/95 EDN-Design
Ideas |
Isolated Telecomm Converter Handles 25W: 09/01/97 EDN-Design
Ideas / Telecomm applications in the central office
require an isolated5V supply derived from �48V, this gives out5V
at5A from an input voltage of �36 to �72V
|
LAN Power Supply Generates Isolated 9V: 04/11/96 EDN-Design
Ideas |
Layout Guidelines for Switching Power Supplies: National
Semiconductor Application Notes,24 May2001 |
LH1605 Switching Regulator: National Semiconductor
Application Notes,04 Nov1995 |
Li ion Boost Circuit uses No inductors: 09/12/97 EDN-Design
Ideas / Circuit to maintain regulated3.3V supply for portable
applications |
LIER Circuit helps Power Supply Efficiency: 02/16/95 EDN-Design
Ideas |
Linear regulator=low cost dc/dc converter: 06/13/2002 EDN -
Design Ideas / The circuit in Figure 1 is a good choice if you
need a power supply with high efficiency and you don't want to
use expensive dc/dc-converter ICs. The heart of the circuit is
IC1, the common, inexpensive LM7805 linear regulator. The
external switch is a pnp transistor; the circuit can easily
source more than 1A output current.. |
Linear supply uses switch mode regulation: 07/19/2001 EDN -
Design Ideas / You can use simple circuits to implement small,
regulated plug-in power supplies. In Figure 1 , a basic and
versatile 5V supply uses a Zener diode and an emitter-follower
transistor. You must calculate and design the transformer such
that Q 1 is close to saturation at low mains voltages and
nominal output current.. |
LM2577 Three Output, Isolated Flyback Regulator: National
Semiconductor Application Notes,01 May1998 |
LM2651_3.3V_EVAL 1.5High Efficiency Synchronous Switching
Regulator Evaluation Board: National Semiconductor
Application Notes,14 Sep1999 |
LM2675 5.0EVAL 1 Amp Step Down High Efficiency Simple Switcher
Evaluation Board: National Semiconductor Application
Notes,10 Feb1999 |
LM267X 3A, 5Evaluation Boards: National Semiconductor
Application Notes,20 Jul1999 |
LM78S40 Switching Voltage Regulator Applications: National
Semiconductor Application Notes,02 Mar1999 |
Low Cost Circuit Biases VCOs for Cable & TV: 11/20/97 EDN-Design
Ideas / PLLs are useful in a variety of applications, most
notably cable and TV tuners |
Low cost feedback circuit boosts efficiency: 01/21/99 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find
this circuit |
Low Cost Switcher Converts 5 to 24V: 02/16/98 EDN-Design
Ideas / Low-cost, three-transistor low power boost switching
regulator
|
Low Cost, Low Parts Count DC / DC Converter With Multiple
Outputs: National Semiconductor Application Notes,02 Mar1999
|
Low Noise Step up Supply Generates �5.5 Volt Output:
10/09/97 EDN-Design Ideas |
Low Power Converter has Galvanic Isolation: 07/02/98 EDN-Design
Ideas / This simple dc/dc converter provides a12V,150-mW output
using only a few components and a small transformer, CD4049
forms an oscillator that operates at approximately200 kHz and
runs the converter, regulated output
|
Lower dc/dc converter ripple by using optimum capacitor hookup:
10/31/2002 EDN - Design Ideas / Low-ripple-voltage
positive-to-negative dc/dc converters find use in many of
today's high- frequency and noise-sensitive disk drives,
battery-powered devices, portable computers, and automotive
applications. Like a positive buck converter, a
positive-to-negative converter can have low output-ripple
voltage if you place the bulk input capacitor between VIN and
VOUT rather than between VIN and gr.... |
Maximizing Start up Loads With the LM3352 Regulated Buck / Boost
Switched Capacitor Converter: National Semiconductor
Application Notes,15 Sep1999 |
Memory Supply Includes Battery Backup: 02/03/97 EDN-Design
Ideas |
Notebook Power Supply has Two Outputs: 03/03/94 EDN-Design
Ideas |
Off Hook Phone Line Supplies 150 MW: 11/09/00 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find the one
of interest09/01/94 EDN Design Ideas / Circuit draws Current in
the off hook condition, delivering as much as150 mW of isolated
poser while allowing normal voice or Data communications over
the phone line
|
Off Line Buck Regulator Cuts Costs, Leadtime: 10/26/95 EDN-Design
Ideas |
Off Line Power Supply Requires Few Parts: 02/17/94 EDN-Design
Ideas / This simple non-isolated off-line power supply can
provide up to150 mA5V and uses only a handful of components
from110-230-Volt AC input voltage. Note that the low voltage
output is directly connected to the mains; it cannot be used
when the low voltage part can be touched.
|
One 9 Volt Battery gives +18, +25, +33V: This circuit is
based on MAX1044 is a charge pump converter.
|
Open Loop Power Supply Delivers As Much As One Watt:
01/18/01 EDN-Design Ideas / PDF contains multiple circuits -
scroll to find this circuit- For VCRs, TVs, and other equipment
that requires a standby mode, you must supply power to a �P when
other components are asleep. Any active power-supply circuit
also needs to be more cost- effective than the standard
structure using a metallic transformer. This circuit is simple
switcher that takes230-Volt AC and outputs10-Volt 90mA
|
PFM Control Improves Dual Output Converter: 09/28/95 EDN-Design
Ideas |
Plus 5 to Minus 15 Volts DC Converter: National
Semiconductor Application Notes,28 Jun1996 |
Power Supply Runs off Battery or Wall Adapter: 06/18/98 EDN-Design
Ideas |
Power Switch Provides Soft Start: 03/30/00 EDN-Design Ideas
/ PDF contains multiple circuits - scroll to find the one
of interest / |
Precharged Capacitor Ensures High Side Start up: 08/17/95
EDN-Design Ideas / when you use a high-voltage bridge
driver, such as the IR2110 or the newer IR2155, a complete
driver circuit can exhibit erratic behavior when you apply power
if it is designed exactly right
|
Programmable Source Powers DC MicroMotors: 03/01/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find the one
of interest / A simple, economic, compact, and tricky way of
using the LM723 as a programmable voltage source to drive dc
micromotors which can set the output to a value of200 mV to 6V
|
Pulsing Charge Pump Drives Capacitive Loads: 11/05/98 EDN-Design
Ideas |
Push Pull Driver Provides Isolated 5 Volt At 1A: 03/30/00
EDN-Design Ideas / PDF contains multiple circuits - scroll to
find the one of interest / Regulated5V input to an isolated5V
output with1A current-output capability
|
Quickly discharge power supply capacitors: 07/05/2001 EDN -
Design Ideas / A perennial challenge in power-supply
design is the safe and speedy discharge, or "dump," at turn-off
of the large amount of energy stored in the postrectification
filter capacitors. This energy, CV 2 /2, can usually reach tens
of joules. If you let the capacitors self-discharge, dangerous
voltages can persist on unloaded electrolytic filter capacitors
for hours or even days.. |
Regulator Generates As Many As Four Voltages: 08/03/95 EDN-Design
Ideas |
Saturable Bead Improves Reverse Recovery: 02/03/97 EDN-Design
Ideas |
SEPIC Generates 5 Volt 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-ended primary-inductance
converters), you can separate the VIN pin of the IC from the
input inductor and use a simple Zener regulator to generate the
supply voltage for the IC. This design shows a SEPIC that takes
a4 to28V input and generates5V at100 mA.
|
Serial Interface IC Supplies BiPolar Voltages: 07/06/95 EDN-Design
Ideas |
Simple Boost Converter Generates �27 & �87V: 05/22/97 EDN-Design
Ideas |
Simple Regulator has one Active Part: 03/16/95 EDN-Design
Ideas |
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
|
Single cell lights any LED: 07/05/2001 EDN - Design Ideas /
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.. |
Single IC Biases LCD & GaAsFET Amplifier: 04/09/98 EDN-Design
Ideas |
Single NiCd Cell Drives OpAmp: 12/05/96 EDN-Design Ideas
|
Single Resistor Improves V2 Converter: 08/15/97 EDN-Design
Ideas / V2 control offers a significant improvement in
transient response by using two voltage feedbacks, example
circuit is for generating voltages in1.8-3.3V range
|
Solar Cell Converter offers Positive Start up: 11/09/00 EDN
Design Ideas / PDF contains multiple circuits - scroll to find
this circuit |
Step up / Step Down Converter Takes 2 to 16 Volt Inputs:
11/09/00 EDN Design Ideas / PDF contains multiple circuits -
scroll to find the one of interest / - Switcher where input can
range above and below the regulated voltage, Circuit
accommodates a wide range of input and Output voltages and
supplies Output Currents as high as500 mA
|
Step up Regulator uses only Two Gain Devices: 11/09/00 EDN
Design Ideas / PDF contains multiple circuits - scroll to find
this circuit |
Step up Supply Charges Battery While Serving Load: 11/09/00
EDN Design Ideas / PDF contains multiple circuits - scroll to
find this circuit |
Supply derives 5 and 3.3V from USB port: 12/20/2001 EDN -
Design Ideas / 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. . |
Switch Mode DC Supply: The switching power supply, shown in
the schematic, provides12 volts, at10 amps, maximum, using a
discrete transistor regulator with an op-amp functioning as a
comparator in the feedback circuit. The supply was constructed
in1984 and is variable frequency, as opposed to the pulse width
modulator (PWM) controllers used today. |
Switchedcapacitor Regulator Provides gain: 03/13/98 EDN-Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit |
Switcher IC hikes Battery Charger's Efficiency: 06/23/94 EDN-Design
Ideas |
Switching Converter uses Planar Magnetics: 11/07/96 EDN
Design Ideas |
Switching regulator forms constant current source:
05/30/2002 EDN - Design Ideas / Many applications require
current sources rather than voltage sources. When you need a
high-current source, using a linear regulator is inadvisable,
because of the high power dissipation in the series resistor. To
solve the wasted-power problem, you can use a switch-mode
regulator. The circuit of Figure 1 uses IC1, an LM2576
adjustable regulator.. |
Switching Regulator Output goes Below VREF: 03/17/94 EDN-Design
Ideas |
Synchronized Regulator Produces Coherent Noise: 03/17/94 EDN-Design
Ideas |
Synchronous buck circuit produces negative voltage:
03/06/03 EDN-Design Ideas / 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... |
System Oriented DC to DC Conversion Techniques: National
Semiconductor Application Notes,01 May1998 |
Three Input Supply Powers 3.3 Volt Portables: 10/26/00 EDN
Design Ideas / PDF contains multiple circuits - scroll to find
the one of interest-- Single ended primary inductance Converter
accepts input voltages ranging from3 to more than 6V and
produces a regulated3.3V,200 mA Output
|
Tiny Tiny Inverter Design: little efficient circuit that
runs off of3V, and charges up a little1 uf250-Volt cap all the
way up in about30 seconds |
Transformer Buys Lower Shutdown Current: 11/23/94 EDN-Design
Ideas |
Transformerless Supply Fits CaT Volt Applications: 05/22/97
EDN-Design Ideas / Coaxial CATV systems derive their power from
a 60-Hz square wave that shares the center conductor with the
television channels this circuit generates10 mA at5V DC from it
|
Transistor Pair Lowers PWM IC's Start up Current: 03/18/99
EDN-Design Ideas / PDF contains multiple circuits - scroll to
find this circuit
|
Transistors tame perfidious leakage inductance: 09/27/2001
EDN - Design Ideas / In flyback converters that use primary
regulation, the loose coupling between the power secondary and
the primary auxiliary windings often results in poor
cross-regulation. This situation arises mainly from the leakage
inductance but also comes from the level of the primary clamp
voltage. Figure 1 shows a typical application schematic using On
Semiconductor's (www. . |
Two ACells Power Step Down Regulator: 10/26/00 EDN Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit |
Two Cores Marry, Make Swinging Choke: 10/26/00 EDN Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit |
Universal High Resistance Voltmeter: |
Use a 555 timer as a switch mode power supply: 11/14/2002
EDN - Design Ideas / Most switch-mode power supplies rely on a
PWM (pulse-width-modulated) output that is controlled via
voltage feedback. A 555-timer IC can inexpensively perform PWM.
The circuit in Figure 1 shows how to turn a 555 PWM circuit into
an switch-mode power supply with only one simple equation. The
design uses two 555s |
Use the LM158 / LM258 / LM358 Dual, Single Supply OpAmp :
National Semiconductor Application Notes,14 May2001
|
Wallcube DC / DC Converter is 85% Efficient: 09/12/97 EDN-Design
Ideas / Ubiquitous12V wall cube generates an unregulated dc
voltage of 8 to18V, depending on line voltage and load, this
circuit generates a regulated5V400 mA from it very efficiently
|