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IR2110 High Side Problem

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azadfalah

azadfalah

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Hello friends

I used the following circuit, but the high side mosfets are not turn on.

Untitled.png

c17 & c28 = 15uf

work Frequency= 50hz

R34,36,40,41,26,27,37,39 = 10K
R15,16,19,1721,20,23,24 = 4R


Thank you
 

Hi,

What is "TrNull" and "TrHot"?
--> Connect Vs with the halfbridge outputs, like the datasheets says.

Klaus
 

I connected but it does not work
TrHot => AC1
TrNull => AC2
 

Hi,

Use a scope and measure each pin of the IR2110.

Klaus
 
1) it is easy to kill these devices

2) you need to turn the low side on at least once for ~ 10uS or more to charge the upper bootstrap cap - else the high side UVLO will stop things from working - if your app does not allow enough turn on of the low side during normal desired operation then this can be an issue as the high side storage caps for the 2110 will bleed voltage until the UVLO kicks in again...

- - - Updated - - -

3) pin 5 must go to the mid point of the power totem poles ( half bridges) in each case...
 
Nothing has been said about DC link voltage, SS34 (40 V schottky) can work for low voltage. But bootstrap capacitor of 100 nF works in no way for 50 Hz switching frequency.
 
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