I've sucessfully built a video amplifier using the
LT1193. Now I want to put the +5V and the -5V on the same board with a ~12VDC input. Does anyone have a good transformerless buck circuit for this task?
Oh by the way I just used the circuit shown in the application information part of the LT1193 data sheet.
Dual Vout Supply Chip
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Re: Dual Vout Supply Chip
You can use a voltage divider to get your plus and minus voltages as long as its not tied to the rails.
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Re: Dual Vout Supply Chip
Geo
Digikey and Mouser carry a variety of DC-DC converter chips. If your power requirements are lo, you might want to browse thru their listings. Small and simple but may be a little pricey for your project The nice thing is they require no external components.
Digikey and Mouser carry a variety of DC-DC converter chips. If your power requirements are lo, you might want to browse thru their listings. Small and simple but may be a little pricey for your project The nice thing is they require no external components.
Re: Dual Vout Supply Chip
I couldn't find any DC-DC converters with enough output current. I need + 100mA - 100mA.
The 7805 / 7660 looks like it will work. That is if I can figure out how to use the 7660. At first blush it looks very simple. With two 10uF caps and +5V in I get -5V out? What about the switch to ground from pin 6?
The 7805 / 7660 looks like it will work. That is if I can figure out how to use the 7660. At first blush it looks very simple. With two 10uF caps and +5V in I get -5V out? What about the switch to ground from pin 6?
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Re: Dual Vout Supply Chip
It looks like the pin 6 connection is only if your input voltage is below 3.5V. I don't remember it being there from my use of the older versions of the 7660, but the Maxim version at http://pdfserv.maxim-ic.com/en/ds/ICL7660-MAX1044.pdf shows it.
I don't think you can get 100mA from a 7660 though. I believe they are limited to about 25mA since they're designed for opamp supplies and the like.
I don't think you can get 100mA from a 7660 though. I believe they are limited to about 25mA since they're designed for opamp supplies and the like.
Re: Dual Vout Supply Chip
Ask the guy that sold you the LT1193. Linear Tech makes lots of power supply chips. 1054 sounds like one that will flip a 5V input to -5V...
<small>[ March 22, 2006, 02:22 PM: Message edited by: cato ]</small>
<small>[ March 22, 2006, 02:22 PM: Message edited by: cato ]</small>
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Re: Dual Vout Supply Chip
or u can use a clamping network to convert 12 to 5v, simple few resistors
yours shiva
Re: Dual Vout Supply Chip
LT1193 looks good. I'll post my finished design when complete. Thanks for the help.
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