I am trying to design a switch-mode boost converter using a MAX1771. As far as I know, when designing this kind of converters there are a few parameters that must be set. In my case these are:
- Vin = 12V
- Iin (max) = 2A
- Vout = 210V
- Iout = 5-6mA (with pretty much no variation)
Once this is set it is important to decide whether we want the Boost converter to work in DCM o CCM (trying to avoid to work on the frontier between both modes). Accordingly to this, an inductor value is chosen. Let's say that in my case a 100uH inductor with a switching frequency of 300KHz would work.
This is how I would design it with an IC like TPS4021x or a 555 timer (just to stay a couple of examples). Please correct me if it is a bad method. The problem is that I can not work out a design with MAX1771 using this process since I can not choose the switching frequency nor duty cicle.
my questions are the following.
- Which process do I have to follow to design a switch mode boost converter using a MAX1771 integrated? How can I control the circuit parameters and know how is it working?
- How do I choose a proper Rsense value for such a high output voltage? (No information is provided in the datasheet for these Vout values).