Electronics, PCB Design and PCB Layout Daycounter, Inc.
Engineering Services

Custom Firmware, Electronics Design, and PCB Layout

                 
 
Electronics Design
Firmware Development
Software Development
Embedded Design
PCB Layout
Digital Signal Processing (DSP)
Reverse Engineering
Prototyping
Device Driver Development
VHDL
Motor Controllers
Microcontrollers
Data Acquisition Systems
Palm OS Software
Windows CE Software
Pocket PC Software
Design for Manufacturing
Through Hole to Surface Mount (SMT) Conversion 
Microchip PIC Consultant
MSP430 Development
DSP56 Development
RoHs Redesign
Design for USB



Silver Board Contract Assembly


 

Flyback Switch Mode Power Supply Circuit

See our other Circuits.

This is a flyback SMPS that will boost voltage a voltage of around 20V to 40V, or more if you change the feedback resistors.  It uses an off the shelf transformer from CoilCraft. 

The LM3479 is a nice controller because it's frequency of operation can be set by changing R1.  At 39K it runs at about 500KHz.   

One innovation of the circuit is that the regulator is driven with +5V, a smaller voltage than VPIN.  Separating the regulator voltage supply from the supply driving the coil allows VPIN to be nearly any value.  Of course you need to have the 5V generated else where.  

The circuit also has a non-dissipative snubber circuit on the drain of the MOSFET, to limit the voltage spikes when the transistor turns off.

See our calculators to make modifications to the feedback circuit, or use a different transformer. 

 

 

Do you need help with an electronics design?  Daycounter provides contract electronics design services. Contact us to give you a quote on your electronics design project.

 

[Employment] [Downloads] [Articles] [Contact Us]

Salt Lake City, UT, USA

Disclaimer: Daycounter, Inc. doesn't guarantee the accuracy of any of it's content. Use at your own risk.

© Copyright 2016 Daycounter, Inc. All rights Reserved.






Soil Moisture Sensor Probe



Water Level Sensor