VVV said:I cannot believe that using just the upper transistor with the load to ground did not work. Please check the bootstrap diode and cap.
Can you please describe what you are trying to achieve?
Are you trying to just PWM the voltage to a load, or are you trying to actually build a bridge? Because now there is no load, but there is a port labelled output.
yogikool said:Hi all
pl. find the tipical connection ckt. giiven in IR2110 datasheet
I’m using this typical connection ckt. For driving a Lamp load( two 800w lamps in parallel—total resistance ==2.68 ohm) for my study experiment purpose.
Load supply voltage =300vdc;
I’m using IGBT instead of MOSFET
My switching frequency is 200HZ , 50 % duty cycle (is it too low???)
Hin & Lin pins are shorted just because to turn on & off both IGBTs at same time
I think the operating frequence is too low, you should use a larger value
bootstrap capacitor.
best regards
& for same period ; (is this right ???)
Problem I’ facing:::---
After exactly 35 ms the High side gate drive pulse (HO) is missing for 1 sec., while there is no problem fo LO, this reflects in Lamp blinking.
Currently My bootstrap capacitor is 1000uF.
I experimented with several values for bootstrap capacitor, Lesser the capacitor value HO missing is more frequent (timing is less then 35 ms) ;
Pl. can any one explain me what mistake I am doing ??
Also can I use this ckt to drive capacitive load ????
Thanks in advance
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