RD-184 - Low Noise Split Rail Non-Isolated Boost +/- 12V Power Supply
Design Specifications
  Input Range Output 1 Output 2
  LM5001    Min 4.5V     12V     -12V  
  Max 5.5V     40 mA  
   40 mA  

Design Description

This circuit boosts 5V to a low noise +/- 12V bias at 40mA for use in analog circuitry. This design uses the LM5001 fully integrated switch mode regulator in concert with a very small EP5 transformer to create a non-isolated positive and negative power rail (for isolation see RD-171). This design uses less than 1 square inch of double sided PCB with components on only one side. The same basic circuit can be used to develop other voltages such as +/- 15V or +/- 5V.

   Design Resources
• RD-184 Reference Design
•  CAD Design Files (source schematic, board layout and gerber files)

Additional Product Resources

LM5001 - High Voltage Switch Mode Boost, Flyback, Sepic Regulator
 
  • datasheet
  • application notes
  • Webench Online design tools
  • samples
   Features
The performance of the reference design is as follows:
  • 5V Input
  • +/- 12V Outputs
  • Over 40 mA Output Current
  • Low Ripple Noise for split rail analog circuits (< 2 mV p-p)
  • Small Size ~1" x 1"

LM5001 +/- 12V Bias Supply Reference Design
+/- 12V Bias Board Photo

LM5001 +/- 12V Bias Supply Reference Design