Electronics > Beginners
Dealing with IR2108 MOSFET/IGBT Driver
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hussamaldean:
Hi all
recently I bought this MOSFET driver which I will use to build an inverter (single and three phase).
However, when I tried to use on of them to control the 2 mosfets I have for single phase inverter, I can see only the positive wave not the negative (i.e half-wave rectifier) based on the circuit below



capacitor 10uF 400V
resistors 100Ohm
diode 0.5V forward voltage drop

any solution or one mosfet driver drives only 1 mosfet ?

regards
Seekonk:
I know that circuit is right off the data sheet, IT IS CRAP AND WILL NEVER WORK.  It is a test schematic for testing each output SEPARATELY.  Tie the two outputs together!
hussamaldean:

--- Quote from: Seekonk on May 25, 2018, 01:10:59 pm ---I know that circuit is right off the data sheet, IT IS CRAP AND WILL NEVER WORK.  It is a test schematic for testing each output SEPARATELY.  Tie the two outputs together!

--- End quote ---
any suggestions?
jdraughn:
Each of those drivers will drive two mosfets, but the output on the schematic can be misleading because it looks like two outputs for connecting each side of a load when they should be tied together.  The top mosfet is responsible for passing the input voltage out, and the bottom one is responsible for passing the voltage coming in from the right, down to ground. You need two sets of the above circuit (which is a half bridge), one for each side of the load to create a full h-bridge.
Doctorandus_P:
If you want more sensible feedback, then post the complete schematic of what you have tried, and tell us what kind of signals you have measured, and what you want etc.

A cut & paste of an incomplete picture from a datasheet does not tell us much.
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