Hi all,

got a question for IR2109 HO and LO pin

schematic diagram,datasheet of component used attached*
my bootstrap capacitor i'm using a 100nF because i can't find any 506nF (maybe there is no such value for capacitor)
CW and ACW is my signal pin to control my U1 and U2 respectively
i'm putting a 24V to CW and ACW which will be step down to ~12v*

ideal result is when i did not put in 24v to my CW or ACW
U1 & U2:
Pin 2 (IN) = 0v
Pin 5 (LO) = 0V
Pin 7 (HO) = 0V
which means none of my MOSFET is turn on.


First problem(s) is
when i didn't put any voltage to my CW and ACW
U1
Pin 7 (HO) = 12v
Pin 5 (LO) = 15v

U2
Pin 7 (HO) =0v
Pin 5 (LOW) = 15v

which means both of my lower side MOSFET is turn on and one of my High MOSFET is turn on = short circuit

i've checked my connections and part numbers... but still cant find the reason why it got this kind of problems

whoever have this same problem as me before and already solved it/ any person know the reason why... please tell me..need to solve this problem ASAP..

THANKS A LOT GUYS FOR READING AND REPLY

 

http://tahmidmc.blogspot.ca/2013/01/using-high-low-side-driver-ir2110-with.html
Max.

 

BUMPS

 

For a start did you read the attachment in #2 regarding gate components?
Max.

 

For a start did you read the attachment in #2 regarding gate components?
Max.

problem solved
thanks !