Ir2117 mosfet driver

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mshh

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i used ir2117 to drive mosfet for dc dc buck converter the input for the driver is pwm from microcontroller i attached the circuit but there is a problem the output from this driver is 9v pure dc not pwm like the input
 

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What is the level of the signal driving the IC input?
You mentioned a microcontroller, does this mean 0-5v ?

Note that the datasheet says that with 15v VCC, logic low is <6v and logic high >9v

 

yes the logic signal from 0-5 v, in datasheet recommended operating conditions Vin [min is 0 max is Vcc]
 
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Vcc is 15v in this case, you need to raise the 5v signal to more than 9v for the input to detect it as high.
You should use a level translator between the mcu and IR2117 to convert the 0-5v to 0-15v (or so)
 

could you propose another mosfet driver that doesn't need level translator ?
 

any help people ? it is written datasheet Vin is ranging from 0- Vcc
 

mshh said:
any help people ? it is written datasheet Vin is ranging from 0- Vcc
Click to expand...

As I said Vcc=15v so why do you keep repeating that 0-15v input range?

I was very clear on the cause of the problem, did you read the image I attached?

Here it is again


The input understands as low any signal below 6v and understands as high any signal higher than 9.5v, so how do you expect this to work with 0-5v ?
 

i haven't connected voltage to drain yet , i think it should give output on the gate , there is no relation to drain.

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so , how do you explain this pic

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the same thing as you said is written in IR2110 however it can drive down to 3.3 volt https://www.edaboard.com/threads/219997/
 

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mshh said:
so , how do you explain this pic
Click to expand...

I'm interested on how you explain it, what do you think it says?

mshh said:
the same thing as you said is written in IR2110 however it can drive down to 3.3 volt
Click to expand...

IR2110 recommended range for VDD is Vss+3v to Vss+20, that means that for Vss=0 the logic level supply can be as low as 3v in which case you can drive the input even with 3v

On the other hand for IR2117 the recommended range for Vcc is 10 to 20v so it can't work with 0-5v input.
 

do you show your self !
Click to expand...
Not at all

are you proud of replying in two forums ?!
Click to expand...
You are the one who asked in both forums simultaneously so I have the right to reply in both.


mshh said:
so how could you explain what happenned in this posthttps://www.edaboard.com/threads/219997/ while IR2110 working directly from microcontroller
Click to expand...

I already told you that for IR2110 you can use a logic level supply as low as 3v while in IR2117 you can go as low as 10v (in your circuit its 15v)

The IR2110 schematic you have posted uses VDD=5v , that is out of range for IR2117
 

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