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Negative Voltage - A negative supply can be produced by a "Charge-Pump"
circuit created with a 555, diodes and capacitors as shown in the following
circuit. The output will deliver about 50mA. |
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Negative Voltage Generator - takes in +12V and outputs around -11V
(added 4/02) |
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Negative Voltage Load Switch - The good thing about this design is that
i can make use of the system i/o voltage to control the on/off and this is the
whole idea. However, there are many many type of load switches that turn of
negative voltages….(Circuit designed by Nicholas Choong added 3/06) |
|
Network linearizes dc/dc converter's current limit characteristics -
13-Oct-05 Issue of EDN Thermistor adds to efficiency, eliminates sense
resistor..... [Design Idea by John Guy and Lance Yang, Maxim Integrated Products
Inc, Sunnyvale, CA; Edited by Brad Thompson and Fran Granville] |
|
One 9 Volt Battery Gives +18 +25 +33V - This circuit is based on MAX1044
is a charge pump converter. (added 4/02) |
|
Output Adjustable Flyback Converter - A high voltage step-up DC power
supply using adjustable flyback conversion. (added 10/05) [Simon Oh] |
|
Power over Ethernet: Sync Flyback Reference Design - This reference
design presents an alternative to the typical boost power regulator. A buck
converter IC is used to generate a higher voltage needed by the white light LED
power from a Ni-Cd battery. This circuit operates by turning the high switch
on, connecting the battery voltage across the inductor.....(added 3/05)
|
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Power Supply (psu 1) - Electroinic circuit design…. [from Harry
Lythall's website] |
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Power Supply Design Basics - Aimed at system designers whose interest
focusses on other fields, this note reviews the basic power supply design knowhow
assumed in the rest of the book…. [by P. ANTONIAZZI] |
|
Power Supply Fits into Small Spaces - 11/13/03 EDN-Design Ideas.....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..... EDN is migrating links.
This link is not verified. Search the "title" + "EDN" for new link. |
|
Pulsing Charge Pump Drives Capacitive Loads - 11/05/98 EDN-Design
Ideas.....The test circuit in Figure 1 efficiently drives various capacitive
loads, such as memory cells and simple capacitors, so that you can observe their
leakage effects. Essentially, the circuit is a pulsed and variable current source
acting as a charge pump. A pulsed voltage source drives a one-shot
oscillator.….Several circuits here, scroll to find this one..... [Design Idea by
Paul J Rose, Mental Automation Inc, Bellevue, WA] |
|
Reduce EMI by sweeping a power supply's frequency - 27-May-04 Issue of
EDN Switching power supplies can be notorious noise generators. You should
prevent this noise, which is conducted, radiated, or both, from returning to the
input source, where it can potentially wreak havoc on other devices operating from
the same input power. The goal of an EMI (electromagnetic-interference] filter is
to block this noise and provide a low-impedance path back to the noise source.....
[Design Idea by John Betten, Texas Instruments, Dallas, TX] |
|
Regulated 12V Supply (Mick Devine) - This circuit above uses a 13 volt
zener diode, D2 which provides the voltage regulation. Aprroximately 0.7 Volts are
dropped across the transistors b-e junction, leaving a higher current 12.3 Volt
output supply. This circuit can supply loads of up to 500 mA. This
circuit is also known as an amplified zener circuit..... |
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Regulated Charge Pump Delivers 50ma - Maxim Application Note #35 (app note
added 5/08) |
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Regulated Step Up Converter Provides High Efficiency Without Inductors -
Maxim Application Note #44 (app note added 5/08) |
|
Self-modifying code extends addressing-mode - 12/17/98 Issue of EDN
As just about any assembly-language programmer knows, self-modifying code (SMC) is
usually undesirable, unintentional, and destructive. However, the SMC routine in
Listing 1 is extremely useful to extend the indexed, 16-bit offset addressing mode
of the venerable HC05 µC from 8 bits, or 256 locations, to the full 13-bit
(8-kbyte) memory address space.....Page includes several designs. Scroll to
find this one..... [Design Idea by Paul Sofianos, Motorola Inc, Tempe, AZ] |
|
Simple +5V Power Supply Circuit - (electronic circuit added 4/05)
|
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Simple Circuit Provides +5 Volt Gate Bias From 48 Volt Input -
Maxim Application Note #1803 (app note added 5/08) |
|
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] |
|
Simple Methods Reduce Input Ripple for All Charge Pumps - Maxim
Application Note #2027 (app note added 5/08) |
|
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] |
|
Simple Switching Power Supply (karl lunt) - I built a PCB for a simple
switching power supply, originally designed by Keith Payea of the SRS. It
uses an LM393, a P-channel power MOSFET, and darn little else. Since its frequency
varies based on load (and nearly everything else imaginable), you can use junk-box
parts and build it for cheap..... |
|
Simple technique improves transient dynamics - 06/24/99 EDN-Design
Ideas.....Designing low-voltage, high-current converters with fast dynamic
performance places stringent demands on a system designer. However, a simple
technique reduces the peak voltage deviation and decreases the response time for a
transient load step.....(added 2/06] EDN is migrating links. This link is
not verified. Google the "title" EDN for new link. |
|
Supplying Power via the1 Wire Bus - Maxim App Note #949 (app note added
5/08) |
|
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. (added 4/02) |
|
Switched capacitor IC and reference form elegant –48 to +10V converter -
24-Apr-03 Issue of EDN A system designer must almost always face a trade-off
in choosing the right part for an application. The trade-off usually involves
performance, price, and function. An example is the issue of powering circuits
from a telecom-voltage source. Telecom systems almost exclusively use
high-potential negative rails, such as -48V..... [Design Idea by Wallace Ly,
National Semiconductor, Santa Clara, CA] |
|
Switching Power Supply - I built a PCB for a simple switching power
supply, originally designed by Keith Payea of the SRS. It uses an LM393, a
P-channel power MOSFET, and darn little else. Since its frequency varies based on
load (and nearly everything else imaginable), you can use junk-box parts and build
it for cheap..... |
|
Synchronous Buck Reference Design - This reference design is a 5Vdc
input to 1.65V @ 1A output synchronous buck converter. The controller is the
TPS40003 operating at 600KHz. The controller features Predictive Gate Drive, which
minimizes the bottom FET body diode conduction time. This provides the
benefit of increased efficiency when compared to a standard gate drive
method.....(added 3/05) |
