DC_to_dC
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.
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, tw1o-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 tw1o 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 tw1o 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 tw1o 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 netw1ork 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
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 betw1een VIN and
VOUT rather than betw1een 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 tw1o 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
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 tw1o 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 tw1o 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 betw1een 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. .
tw1o ACells Power Step Down Regulator: 10/26/00 EDN Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit
tw1o Cores Marry, Make Swinging Choke: 10/26/00 EDN Design
Ideas / PDF contains multiple circuits - scroll to find this
circuit
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 tw1o 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
