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Power
Supplies: Switch Mode
Page 1
Switchmode Power Supply:
#'s-A, B-E,
F-R,
S,
T-V
Boost, Buck,
Buck/Boost
Power Supplies -- Main
Page
Converters -- Main Page
Last Updated on:
Monday, October 03, 2011 06:07 PM
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Circuits Designed by Dave Johnson, P.E. : |
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0.5V Negative Supply
Although not very efficient, this simple circuit, consisting of two LEDs and a
photo diode, generates a negative voltage with a current level of a couple
milliamps. It is ideal for supplying a negative rail to low power “rail to
rail” op amp circuits, which need to have a true zero volts output.
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Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
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1.5A High Efficiency Synchronous Switching Regulator Evaluation Board
- evaluation board is designed to supply 3.3V at 15 mA up to
1.5A. input voltage range is 4V to 14V. Components were selected
based on design procedure in LM2651 datasheet. PCB layout is
critical to reduce noise and ensure…. (app note added 3/05) |
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120 VAC Lamp Dimmer - Page has several circuits, please
scrollto find this one. |
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124 Volt AC Lamp Chaser using Solid State Relays - This
circuit is similar to LED clock using12 neon indicator lamps
instead of LEDs. It operates from2 high capacity ni-cad cells (2.5
volts) which keep it going for a couple weeks. High voltage (70 volts)
for neon lamps is obtained from a small....(added 4/02)
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1-kV power supply produces a continuous arc - 5-Feb-04 Issue
of EDN Designing a high-voltage switching power supply that can
produce a sustained arc can be challenging. This compact and
efficient design delivers 1 kV at 20W and can withstand a continuous
arcing, or short-circuit, condition.... [Design Idea by Robert Sheehan,
Linear Technology, Milpitas, CA] |
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2 Cores Marry Make Swinging Choke - 05/11/95 EDN-Design
Ideas....Designing an output choke for a switch-mode power supply that must
operate over large load variations can be problematic. If you design the inductor
for the maximum load the power converter will see, the inductance will be below
the critical inductance required at light load. This inadequate inductance
will cause the voltage on the output capacitor to peak up, resulting in increased
ripple on the output.... [Design Idea by Vincent Spataro, GEC Marconi Electronic
Systems Corp, Wayne, NJ] |
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2 Watt Switching Power Supply - In this small switching power supply, a
Schmitt trigger oscillator is used to drive a switching transistor that supplies
current to a small inductor. Energy is stored in the inductor while the transistor
is on, and released into the load circuit when the transistor switches off. The
output voltage is dependent on the load resistance and is limited by a zener diode
that stops the oscillator when the voltage reaches about 14 volts. Higher or lower
voltages can be obtained by adjusting the voltage divider that feeds the zener
diode. The efficiency is about 80% using a high Q inductor.... [Bill Bowden's
website] |
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2 Watt Switching Power Supplyy - Page has several circuits, please
scrollto find this one. |
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20 Watt Simple Switcher Forward Converter - National Semiconductor
Application Note 01 May1998 (app note added 7/02) |
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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,.... [Design Idea by Chester Simpson, National Semiconductor, Santa Clara,
CA] |
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A Fairchild Power Switch based on Switched Mode Power Supply for CRT Monitor Use/
AN-4108 - Fairchild Application Notes / (app note added 6/06)
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A Fairchild Power Switch Based SMPS for Color Television Receivers/ AN-4102 -
Fairchild Application Notes / (app note added 6/06) |
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A Simple Switching Power Supply - A Versatile and useful supply to
Experiment withGood for the Beginner to learn....(Circuit design added 12/08)
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AB-8/ Selection of MOSFETs in Switch Mode DC-DC Converters - Fairchild
Application Notes / (app note added 6/06) |
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AN-1149: Layout Guidelines for Switching Power Supplies - National
Semiconductor Application Note (app note added 2/06) |
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AN-1215: LM2655 2.5A Synchronous Switching Regulator Evaluation Board -
National Semiconductor Application Note (app note added 2/06) |
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AN-1229: SIMPLE SWITCHER PCB Layout Guidelines - National Semiconductor
Application Note (app note added 2/06) |
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AN-4108/ A Fairchild Power Switch based on Switched Mode Power Supply for CRT
Monitor Use - Fairchild Application Notes / (app note added 6/06)
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AN-4116/ A Fairchild Power Switch FPS based on Switched Mode Power Supply for LCD
Monitor Use - Fairchild Application Notes / (app note added 6/06)
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AN-557: Optimizing the Ultra-Fast POWERplanar Rectifier Diode for Switching Power
Supplies - National Semiconductor Application Note (app note added
2/06) |
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AN701: Switch Mode Battery Eliminator Based on a PIC16C72a - Microchip
Application Note Published 25-Mar-99 (app note added 2/06) |
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AN786: Considerations for Driving Power MOSFETs in High-Current, Switch Mode
Regulators - Microchip Application Note Published 12-Nov-02....[App
Note] |
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AN980: Designing a Boost-Switching Regulator with the MCP1650 -
Microchip Application Note Published 1-Apr-05 (app note added 2/06)
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AN-D25: LND1 Series: Efficient Switchmode Power Supply Start-Up -
Supertex Semiconductors (app note added 2/06) |
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Switchmode Power Supply:
#'s-A,
B-E,
F-R,
S,
T-V |
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