Using the IR2110.

Community Projects
1

I’m studying some open source examples of solar charge controllers and it has been suggested to me that I read and understand:

http://tahmidmc.blogspot.com/2013/01/us … -with.html

In regards to the VDD Logic Supply. It is not fully clear to me yet however I think the VDD is the line used to provide power to the IR2110. I think what is being hinted at is that a micro controller can be used to supply a 5V current of some mA’s as would be output by an Arduino UNO or similar device. I’m new to reading Functional Block Diagrams like the one in the blog. It appears that symbolically VDD inside the IC is depicted as:

http://imgur.com/YJQmAAn

So the symbol is just a leader arrow which symbolically doesn’t appear to be connected to any of the other components in the IC. What does this type of leader arrow mean in such a case as the description of the VDD line?

It is described in the blog:

It is common practice to use VDD = +5V. When VDD = +5V, the logic 1 input threshold is slightly higher than 3V. Thus when VDD = +5V, the IR2110 can be used to drive loads when input “1” is higher than 3 point something volts.

I think what that means is that with VDD being supplied @ 5V that loads can be driven that are anywhere between a 3V load and a MAXV load. I don’t really know what the max load is I think its 20V. I don’t really understand at this point what the Logic Input Threshold actually is but I’m working on that.

Could I get some further explanation?

Thank you

2

The leader arrow on Vdd in that diagram just means that Vdd is connected to any blocks on the chip that need it. Just like the ground symbol, it reduces clutter in the diagram.

Vdd powers the logic circuitry, so the threshold on the input pins HIN, LIN, and SD are dependent on Vdd. The graph in the page you linked to (from the data sheet) shows the relationship between Vdd and the voltage you must put on an input pin to be called a logic “1”.

Vdd doesn’t directly drive the loads; The low side output is driven from Vcc, and the high side from Vb (which may be generated from Vcc and an external charge-pump capacitor).

/mike