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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 26, 2009 03:51 AM

 

Circuits Designed by Dave Johnson, P.E. :
  • 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.

 


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1 kV Power Supply produces a continuous arc - 02/05/04 EDN-Design Ideas: 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 added 1/05)

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)

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)

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 added 2/06)

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...(added 4/02)

20 Watt Simple Switcher Forward Converter - National Semiconductor Application Note 01 May1998 (app note added 7/02)

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.....(design idea added 3/03)

A Fairchild Power Switch based on Switched Mode Power Supply for CRT Monitor Use/ AN-4108 - Fairchild Application Notes / (app note added 6/06)

A Fairchild Power Switch Based SMPS for Color Television Receivers/ AN-4102 - Fairchild Application Notes / (app note added 6/06)

A Simple Switching Power Supply -  A Versatile and useful supply to Experiment withGood for the Beginner to learn....(circuit design added 12/08)

AB-8/ Selection of MOSFETs in Switch Mode DC-DC Converters - Fairchild Application Notes / (app note added 6/06)

AN-1149: Layout Guidelines for Switching Power Supplies - National Semiconductor Application Note  (app note added 2/06)

AN-1215: LM2655 2.5A Synchronous Switching Regulator Evaluation Board - National Semiconductor Application Note  (app note added 2/06)

AN-1229: SIMPLE SWITCHER PCB Layout Guidelines - National Semiconductor Application Note  (app note added 2/06)

AN-4108/ A Fairchild Power Switch based on Switched Mode Power Supply for CRT Monitor Use - Fairchild Application Notes / (app note added 6/06)

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)

AN-557: Optimizing the Ultra-Fast POWERplanar Rectifier Diode for Switching Power Supplies - National Semiconductor Application Note  (app note added 2/06)

AN701: Switch Mode Battery Eliminator Based on a PIC16C72a - Microchip Application Note Published 25-Mar-99  (app note added 2/06)

AN786: Considerations for Driving Power MOSFETs in High-Current, Switch Mode Regulators - Microchip Application Note Published 12-Nov-02  (app note added 6/06)

AN980: Designing a Boost-Switching Regulator with the MCP1650 - Microchip Application Note Published 1-Apr-05  (app note added 2/06)

AN-D25: LND1 Series: Efficient Switchmode Power Supply Start-Up - Supertex Semiconductors  (app note added 2/06)


           
Switchmode Power Supply:  #'s-A,     B-E,     F-R,     S,     T-V
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