hi all, i have some problem to my project. the block diagram here

as you can see, SM connected each other by two pin out of half brigde. 1 : mid of two mosfet 2: negative of capaciter
so, when implement, i use ir2103 to driver two mosfer, when i run each SM is ok but when connect them together i have problem.

so, pin COM of IR2103 above connect Vs of IR2103 below and circuit not run.
anyone can give me a suggest.
thank you verry much and i'm sorry for my bad english.

 

or choose other driver ?????????

 

or choose other driver ?????????

I think you will need to build your own as ground is shared with the low voltage section of the IC.

 

I think you will need to build your own as ground is shared with the low voltage section of the IC.

what do you mean?
when i connect two SM , Mosfet lower (Q11 and Q11) alway OFF state and Mosfet high (Q1 and Q2) alway ON state.

 

Do you have a separate FLOATING power source for each driver?

You show connecting pin 4 of all the drivers together, via the common GROUND symbol- it clearly will not work this way.

 

Do you have a separate FLOATING power source for each driver?

You show connecting pin 4 of all the drivers together, via the common GROUND symbol- it clearly will not work this way.

now i use one power source for all SM. So i will try using separate floating power source for each driver

 

if must use separate power supply for each driver, circuit becomes bigger and complex. anyone can give me a suggest to solve this problem.
can i use ir2110 for each driver

 

Use a small ISOLATED DC-DC converter to power each floating bridge and driver.