Author Topic: Is my Boost Converter schematic alright? [Those who help get a virtual cookie]  (Read 1568 times)

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Offline EdimarDigitalTopic starter

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Hello everyone, I'm new to electronics and i want to create a digital watch just like the ChronodeVFD http://www.johngineer.com/blog/?p=1595. I will be using a AA battery as my source but we all know micro-controllers need at least 3.3V or more to work and a single cell just delivers 1.5V which is not enough. So i selected a Texas Instruments TPS61070 http://www.ti.com/lit/ds/symlink/tps61070.pdf to deliver the necessary voltage. I created a schematic which i believe should output 3.3V according to the datasheets, but being the total amateur i am to this (since I'm only 17 years old with barely any experience) i need a professional to take a look at the schematic and point out the flaws and what can i do to make work efficiently.

« Last Edit: January 22, 2017, 06:00:03 pm by EdimarDigital »
 

Offline Warhawk

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Hi,
see below:

  • add junctions in your schematic (green dots)
  • add optional capacitors (like 100nF) in paralel with C1 and C2. It is a good engineering habit. You don't need to assembly them unless you need to.
  • your voltage divider is set wrong. Use formula 1 from the datasheet. R2 should be 180k in your case.
  • don't forget to read the PCB layout guidelines in the datasheet. You can also get some inspiration from here: http://www.ti.com/tool/PMP8523?keyMatch=TPS61070&tisearch=tidesigns

I suggest you build a small PCB and test the circuitry first. A board from oshpark.com will be very cheap. Place your board here (web-friendly format) before ordering so we can review it.


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