Im trying to go from 12V to 15V but I seem to be having an issue. I
have the inverting setup giving me -15V and it works fine, but I cant
get the +15V to work. In this data sheet
on page 6 there is the circuit im using. I dont know about the
value of the resistor connected to pin 8, so I used a 220Ω. My values
that I calculated are listed below.
Diode= Schottkey Vf=0.5V
Rsense=100mΩ R1=1k pot R2=10k
You might try using the suggested values from this website. http://www.nomad.ee/micros/mc34063a/index.shtml Another option is to use the TPS61170. Although the IC price is more expensive, the design is very simple, the external parts cost much less, the overall solution is smaller and cheaper. If you have a lower input voltage, the TPS61080, TPS61085, or TPS61087 might work. TI has a very good search tool. Go to www.ti.com, click on "Power Management" on the left and then enter your electrical specs. Ease of design, size, and external parts cost often trumps IC cost.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.