ir2110 full bridge scematic that works

[gedza]

can someone please send me a schematic of a mosfet full bridge of ir2110 that works because I have connected the bridge as shown in the application note an978 but the circuit bridge is not working .I have tested the circuit by sending a signal from the microcontroller and testing the switching at 1hz while putting an led at the HO pin of the driver.

 

[atripathi]

May be you want to share your schematic, so that people can share their inputs on that. This may help you resolve issue quickly.

 

[alexan_e]

Use a higher frequency so that the bootstrap capacitor doesn't discharge between cycles

 

[FvM]

putting an led at the HO pin of the driver

The bootstrap capacitor can power the circuit for quite a long time, but a LED only for microseconds. Not a well considered test setup!

 

[gedza]

I 've put the schematic on the post .It is a halfbridge but it mine is a full bridge can someone pliz send me a schematic of something that proved to be working.

 

[FvM]

The circuit is correct and can work down to a few Hz, but not with án additional load at HO.

 

[gedza]

Is it neccessary to put an optoicoupler between the microcontroller and the ir2110 gate drivers or it can just work as it is.

 

[alexan_e]

You can connect the mcu directly, use an appropriate VDD (IR2110 logic supply voltage) that suits your mcu voltage level.

Logic inputs are compatible with standard CMOS or LSTTL output, down to 3.3V logic.

Alex

 

[grizedale]

have you got enough deadtime in the uc inputs?

Why is that series diode there...you do not want that , between the fets.

and you do not take precaution as per onsemi app notes on their versions, about ensuring your ground pin getting slung below gnd and damaging chip.

sometimes also, due to parasitics, when one fet turns on, the other can get spuriously pulsed on , and cross conduction can happen for that brief interval