pavive Posted May 12, 2006 Report Share Posted May 12, 2006 I have used in the past a TL496 Iintegrated C. Today in Europe is not an easy task to get one like that because they discontinued that part. So, I need to convert those voltages. Anyone knows how can I accomplih this in an easy way?.Thanks in advance.Gus, form Spain Quote Link to comment Share on other sites More sharing options...
ante Posted May 13, 2006 Report Share Posted May 13, 2006 Hi Gus,Welcome to our forum.The TL499A should work here I believe. Quote Link to comment Share on other sites More sharing options...
indulis Posted May 14, 2006 Report Share Posted May 14, 2006 I think your gonna find it very hard to find a PWM that works with a Vcc of 1.5V Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 14, 2006 Report Share Posted May 14, 2006 I think your gonna find it very hard to find a PWM that works with a Vcc of 1.5VThe TL499A works with a minimum of 1.1V supply, but then its output is only 60mW. 10mA at 6V, 20mA at 3V. It even has a series voltage regulator. Quote Link to comment Share on other sites More sharing options...
ante Posted May 14, 2006 Report Share Posted May 14, 2006 I think your gonna find it very hard to find a PWM that works with a Vcc of 1.5VThere are lots of switchers that will run from 0.7 Volts but with a 9 V output it’s harder to find!If it is possible to settle for 5.5 or 6.5 Volts the MAX 1674/76, 1700/1701, 1703, 1705/1706, 1708, 1760/1760H, 1763, 1947, and a few more would do the job. Even though some of these have a voltage divider feedback to set the voltage it’s not recommended to go above 5.5 or 6.5Volts, I wonder why? Could it be loss of performance or what sets the limit here? Anyone? Quote Link to comment Share on other sites More sharing options...
indulis Posted May 15, 2006 Report Share Posted May 15, 2006 If I had to guess, I'd say because of the process used. For example, in the not to distant past, is was almost impossible to get a buck controller that could do 24Vin and 12Vout without all kinds of level shifting circuits. Lot's of PWM's didn't have a problem with the input voltage range, but with the voltage that could be applied to the feedback amp. A lot of them used a 6V process for that part of the die, although Linear Technologies had a few neat tricks to get around that limitation on certain chips. Quote Link to comment Share on other sites More sharing options...
ante Posted May 15, 2006 Report Share Posted May 15, 2006 Hi indulis,I think you got a point there. Since Gus does not reveal the amount of current he needs at 9Volts I’m not really sure where we stand here?If only a few mA are needed it might be possible to use cap / diode step-up right after a MAX1674 chip! Quote Link to comment Share on other sites More sharing options...
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