Need for help with IR2110

[maystro1988]

hey... iam trying to build dc_dc converter with tow mosfet so i must use ir2110 driver, i make the simple test circuit below with tow pwm signal 50% ,first i isolated the Vss and the com, i put the Vss ,Sd and the microcontroller at the same ground ,and i connect the COM with the power circuit ground, i connect the Vdd at 5v with the microcontroller supply and vcc at 12v...... the signal from LO is perfect and at first there is deformed signal from HO and after HO become equal Vcc and never change
after i connect all circuit at the same ground COM=Vss=Sd=microcontroller ground and the problem rest the same
i used 22microF capacitor at 50V
so i will be appreciated if some have an idea
thanks alot

 

[kabeer02]

And make sure you apply 5volt to pin 9 of the IR2110

 

[maystro1988]

thank you for your reply...so i must put the COM=Vss=Sd=microcontroller at the same ground ??? i put Vdd at 5 volt ,,, and what the best value for the capacitor?
thanks alot

 

[kabeer02]

which of the capacitor are you talking about?

 

[maystro1988]

the capacitor between VB and VS ,,,,ok and the other capacitors else between Vcc and COMM,,,,,Vdd andVss ?

 

[kabeer02]

VB-VS i used 22uf then VCC-COMM i used 100uf VDD and VSS 10uf

 

[maystro1988]

thanks alot kabeer i will use this value

 

[picgak]

hey... iam trying to build dc_dc converter with tow mosfet so i must use ir2110 driver, i make the simple test circuit below with tow pwm signal 50% ,first i isolated the Vss and the com, i put the Vss ,Sd and the microcontroller at the same ground ,and i connect the COM with the power circuit ground, i connect the Vdd at 5v with the microcontroller supply and vcc at 12v...... the signal from LO is perfect and at first there is deformed signal from HO and after HO become equal Vcc and never change
after i connect all circuit at the same ground COM=Vss=Sd=microcontroller ground and the problem rest the same
i used 22microF capacitor at 50V
so i will be appreciated if some have an idea
thanks alot

Hi ,
Your problem is quite simple , The problem is R1 and D1 remove both and connect Vs to Q2 your ploblem will be solved. Dont forget to click the helpedme button.
regards ani

 

[maystro1988]

thanks alot picagak i will remove the R1 and D1