I am trying to incorporate a LEM LAH 100-P current sensor into a project. It requires a dual polarity voltage supply between +/- 12 and 15 volts. What is the best way to implement it?
Digi-key has an article which references many other application notes. But I don't have knowledge of power electronics which makes adapting them difficult. This application note seems promising but components used are for an output of -3.3 to -5.5 volts (part at digikey and datasheet).
Figure from the application note: 
What components could be used to create a negative supply of 12 to 15 volts? Any suggestions welcomed.
Answer
As it already has been stated in different comments to the original question, there are different possibilities.
You could use in increasing order of complexity:
- a DC/DC power supply module (typically a plug and play 'block')
- a charge pump (essentially a controller IC with capacitors)
- an inverting switching power supply (essentially a controller IC with inductor)
- an added winding on an existing AC/DC power supply
Since you ask this question, I would suggest you select the first option. Not the cheapest but it is the most fail safe.
For the first 3 options, you can easily use the selection criteria at the large component distributors (Mouser, Farnell, Digi-Key, RS) and select the appropriate input and output voltage range and output current requirement.
No comments:
Post a Comment