Need a 2W Bipolar DC - DC Converter circuit to make a dual rail power supply - diyAudio
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Old 26th August 2012, 03:10 PM   #1
elmura is offline elmura  Australia
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Question Need a 2W Bipolar DC - DC Converter circuit to make a dual rail power supply

G'day techies,
I'm looking to use a 9V battery to power some audio opamps with a 0V ground and + / - 12V to 15V.
I've read that a Bipolar DC-DC converter can do the job but I have no experience with them.

Is there a link to a circuit diagram with components used so I can get this working?

Any advice?

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Old 27th August 2012, 07:12 AM   #2
Calvin is offline Calvin  Germany
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Location: close to Basel

have a look at the LT3471. The calculation of parts values is straightforward.
Its a tiny 3x3mm SMD casing which is quite sensitive to soldering procedure. Similar SEPIC converter chips can be found at Alanalog, Texas, etc.
Also in SMD but in an much easier to solder 10pin MSIOP package comes the LTC1871.
This one require an external switching N-channel MOSFET transistor. See Datasheet p32 for a dual voltage application.
An alternative may be to use a complete dc-dc converter like the very small sized XPPower IM-series (IM2415S or IM2415S, 9-36Vin, at Farnell) or IU-series with lower Vin range and possibility of metal shielded casing.

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Old 27th August 2012, 08:30 AM   #3
elmura is offline elmura  Australia
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Join Date: Aug 2012
Thanks Calvin,
I've started examining their datasheets.
I like the concept of the XPPower unit. Does this mean that you don't need any external parts?
Also, the two models you specified are the same - a typo?
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