How much current does this Opto isolator output (HCPL-3180)?
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I wanted to use it like this in this configuration][How much current does this Opto isolator output (HCPL-3180) ?
opto-isolator
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
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add a comment |
$begingroup$
I wanted to use it like this in this configuration][How much current does this Opto isolator output (HCPL-3180) ?
opto-isolator
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
$endgroup$
add a comment |
$begingroup$
I wanted to use it like this in this configuration][How much current does this Opto isolator output (HCPL-3180) ?
opto-isolator
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
$endgroup$
I wanted to use it like this in this configuration][How much current does this Opto isolator output (HCPL-3180) ?
opto-isolator
opto-isolator
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
edited Dec 27 '18 at 13:57
Daniel Bashy
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
asked Dec 27 '18 at 12:12
Daniel BashyDaniel Bashy
435
435
add a comment |
add a comment |
1 Answer
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$begingroup$
How much current does this Opto isolator output (HCPL-3180) ?
The first page of the data sheet gives some strong clues that I have enhanced with red boxes: -
I wanted to know the average current which will be fed to the MOSFET
If the MOSFET gate-source capacitance is (say) 10 nF and it gets charged to (say) 12 volts, then the peak current will be as stated above (2 to 2.5 amps) and the charge time will be decided by this formula: -
$$i = Ccdot dfrac{dv}{dt}$$
Plugging in 12 volts for "dv" and 2 amps for "i" gives a "dt" (time) of 60 ns. This will be an approximate value because the current will be falling from 2 amps to zero amps over the charge period but something like 100 ns will be reasonable.
If you are switching the MOSFET at 1 MHz, you can make a reasonable argument that 1 amp flows for 100 ns and zero amps flows for about 900 ns repeating every 1000 ns. This approximates the average current to 100 mA.
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
$endgroup$
$begingroup$
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:45
$begingroup$
I have uploaded a picture of what Im trying to achieve, I wanted to know the average current which outputs by the driver so i can calculate the value of the charging and discharging resistors, using the formula Qg = Ig* t , or if i could find out the time
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:53
$begingroup$
My amended answer should give you all the information you need. If you want a more precise answer, use a simulation tool. There are quite a few free ones available. I use micro-cap.
$endgroup$
– Andy aka
Dec 27 '18 at 12:59
$begingroup$
so if my VGS is 15V and the total input capacitance of the MOSFET is 19860pF and I am generating PWM from an Arduino with a frequency of 4kHZ how do i go about it, sorry I am student
$endgroup$
– Daniel Bashy
Dec 27 '18 at 13:10
1
$begingroup$
@DanielBashy please DO NOT evolve this current question the way you have by adding that new circuit diagram. Ask a proper new question for this different subject else it makes my answer look stupid and incomplete.
$endgroup$
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
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$begingroup$
How much current does this Opto isolator output (HCPL-3180) ?
The first page of the data sheet gives some strong clues that I have enhanced with red boxes: -
I wanted to know the average current which will be fed to the MOSFET
If the MOSFET gate-source capacitance is (say) 10 nF and it gets charged to (say) 12 volts, then the peak current will be as stated above (2 to 2.5 amps) and the charge time will be decided by this formula: -
$$i = Ccdot dfrac{dv}{dt}$$
Plugging in 12 volts for "dv" and 2 amps for "i" gives a "dt" (time) of 60 ns. This will be an approximate value because the current will be falling from 2 amps to zero amps over the charge period but something like 100 ns will be reasonable.
If you are switching the MOSFET at 1 MHz, you can make a reasonable argument that 1 amp flows for 100 ns and zero amps flows for about 900 ns repeating every 1000 ns. This approximates the average current to 100 mA.
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
$endgroup$
$begingroup$
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:45
$begingroup$
I have uploaded a picture of what Im trying to achieve, I wanted to know the average current which outputs by the driver so i can calculate the value of the charging and discharging resistors, using the formula Qg = Ig* t , or if i could find out the time
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:53
$begingroup$
My amended answer should give you all the information you need. If you want a more precise answer, use a simulation tool. There are quite a few free ones available. I use micro-cap.
$endgroup$
– Andy aka
Dec 27 '18 at 12:59
$begingroup$
so if my VGS is 15V and the total input capacitance of the MOSFET is 19860pF and I am generating PWM from an Arduino with a frequency of 4kHZ how do i go about it, sorry I am student
$endgroup$
– Daniel Bashy
Dec 27 '18 at 13:10
1
$begingroup$
@DanielBashy please DO NOT evolve this current question the way you have by adding that new circuit diagram. Ask a proper new question for this different subject else it makes my answer look stupid and incomplete.
$endgroup$
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
$begingroup$
How much current does this Opto isolator output (HCPL-3180) ?
The first page of the data sheet gives some strong clues that I have enhanced with red boxes: -
I wanted to know the average current which will be fed to the MOSFET
If the MOSFET gate-source capacitance is (say) 10 nF and it gets charged to (say) 12 volts, then the peak current will be as stated above (2 to 2.5 amps) and the charge time will be decided by this formula: -
$$i = Ccdot dfrac{dv}{dt}$$
Plugging in 12 volts for "dv" and 2 amps for "i" gives a "dt" (time) of 60 ns. This will be an approximate value because the current will be falling from 2 amps to zero amps over the charge period but something like 100 ns will be reasonable.
If you are switching the MOSFET at 1 MHz, you can make a reasonable argument that 1 amp flows for 100 ns and zero amps flows for about 900 ns repeating every 1000 ns. This approximates the average current to 100 mA.
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
$endgroup$
$begingroup$
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:45
$begingroup$
I have uploaded a picture of what Im trying to achieve, I wanted to know the average current which outputs by the driver so i can calculate the value of the charging and discharging resistors, using the formula Qg = Ig* t , or if i could find out the time
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:53
$begingroup$
My amended answer should give you all the information you need. If you want a more precise answer, use a simulation tool. There are quite a few free ones available. I use micro-cap.
$endgroup$
– Andy aka
Dec 27 '18 at 12:59
$begingroup$
so if my VGS is 15V and the total input capacitance of the MOSFET is 19860pF and I am generating PWM from an Arduino with a frequency of 4kHZ how do i go about it, sorry I am student
$endgroup$
– Daniel Bashy
Dec 27 '18 at 13:10
1
$begingroup$
@DanielBashy please DO NOT evolve this current question the way you have by adding that new circuit diagram. Ask a proper new question for this different subject else it makes my answer look stupid and incomplete.
$endgroup$
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
$begingroup$
How much current does this Opto isolator output (HCPL-3180) ?
The first page of the data sheet gives some strong clues that I have enhanced with red boxes: -
I wanted to know the average current which will be fed to the MOSFET
If the MOSFET gate-source capacitance is (say) 10 nF and it gets charged to (say) 12 volts, then the peak current will be as stated above (2 to 2.5 amps) and the charge time will be decided by this formula: -
$$i = Ccdot dfrac{dv}{dt}$$
Plugging in 12 volts for "dv" and 2 amps for "i" gives a "dt" (time) of 60 ns. This will be an approximate value because the current will be falling from 2 amps to zero amps over the charge period but something like 100 ns will be reasonable.
If you are switching the MOSFET at 1 MHz, you can make a reasonable argument that 1 amp flows for 100 ns and zero amps flows for about 900 ns repeating every 1000 ns. This approximates the average current to 100 mA.
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
$endgroup$
How much current does this Opto isolator output (HCPL-3180) ?
The first page of the data sheet gives some strong clues that I have enhanced with red boxes: -
I wanted to know the average current which will be fed to the MOSFET
If the MOSFET gate-source capacitance is (say) 10 nF and it gets charged to (say) 12 volts, then the peak current will be as stated above (2 to 2.5 amps) and the charge time will be decided by this formula: -
$$i = Ccdot dfrac{dv}{dt}$$
Plugging in 12 volts for "dv" and 2 amps for "i" gives a "dt" (time) of 60 ns. This will be an approximate value because the current will be falling from 2 amps to zero amps over the charge period but something like 100 ns will be reasonable.
If you are switching the MOSFET at 1 MHz, you can make a reasonable argument that 1 amp flows for 100 ns and zero amps flows for about 900 ns repeating every 1000 ns. This approximates the average current to 100 mA.
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
edited Dec 27 '18 at 12:56
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
answered Dec 27 '18 at 12:44
Andy akaAndy aka
241k11181414
241k11181414
$begingroup$
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:45
$begingroup$
I have uploaded a picture of what Im trying to achieve, I wanted to know the average current which outputs by the driver so i can calculate the value of the charging and discharging resistors, using the formula Qg = Ig* t , or if i could find out the time
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:53
$begingroup$
My amended answer should give you all the information you need. If you want a more precise answer, use a simulation tool. There are quite a few free ones available. I use micro-cap.
$endgroup$
– Andy aka
Dec 27 '18 at 12:59
$begingroup$
so if my VGS is 15V and the total input capacitance of the MOSFET is 19860pF and I am generating PWM from an Arduino with a frequency of 4kHZ how do i go about it, sorry I am student
$endgroup$
– Daniel Bashy
Dec 27 '18 at 13:10
1
$begingroup$
@DanielBashy please DO NOT evolve this current question the way you have by adding that new circuit diagram. Ask a proper new question for this different subject else it makes my answer look stupid and incomplete.
$endgroup$
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
$begingroup$
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:45
$begingroup$
I have uploaded a picture of what Im trying to achieve, I wanted to know the average current which outputs by the driver so i can calculate the value of the charging and discharging resistors, using the formula Qg = Ig* t , or if i could find out the time
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:53
$begingroup$
My amended answer should give you all the information you need. If you want a more precise answer, use a simulation tool. There are quite a few free ones available. I use micro-cap.
$endgroup$
– Andy aka
Dec 27 '18 at 12:59
$begingroup$
so if my VGS is 15V and the total input capacitance of the MOSFET is 19860pF and I am generating PWM from an Arduino with a frequency of 4kHZ how do i go about it, sorry I am student
$endgroup$
– Daniel Bashy
Dec 27 '18 at 13:10
1
$begingroup$
@DanielBashy please DO NOT evolve this current question the way you have by adding that new circuit diagram. Ask a proper new question for this different subject else it makes my answer look stupid and incomplete.
$endgroup$
– Andy aka
Dec 27 '18 at 13:55
$begingroup$
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:45
$begingroup$
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:45
$begingroup$
I have uploaded a picture of what Im trying to achieve, I wanted to know the average current which outputs by the driver so i can calculate the value of the charging and discharging resistors, using the formula Qg = Ig* t , or if i could find out the time
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:53
$begingroup$
I have uploaded a picture of what Im trying to achieve, I wanted to know the average current which outputs by the driver so i can calculate the value of the charging and discharging resistors, using the formula Qg = Ig* t , or if i could find out the time
$endgroup$
– Daniel Bashy
Dec 27 '18 at 12:53
$begingroup$
My amended answer should give you all the information you need. If you want a more precise answer, use a simulation tool. There are quite a few free ones available. I use micro-cap.
$endgroup$
– Andy aka
Dec 27 '18 at 12:59
$begingroup$
My amended answer should give you all the information you need. If you want a more precise answer, use a simulation tool. There are quite a few free ones available. I use micro-cap.
$endgroup$
– Andy aka
Dec 27 '18 at 12:59
$begingroup$
so if my VGS is 15V and the total input capacitance of the MOSFET is 19860pF and I am generating PWM from an Arduino with a frequency of 4kHZ how do i go about it, sorry I am student
$endgroup$
– Daniel Bashy
Dec 27 '18 at 13:10
$begingroup$
so if my VGS is 15V and the total input capacitance of the MOSFET is 19860pF and I am generating PWM from an Arduino with a frequency of 4kHZ how do i go about it, sorry I am student
$endgroup$
– Daniel Bashy
Dec 27 '18 at 13:10
1
1
$begingroup$
@DanielBashy please DO NOT evolve this current question the way you have by adding that new circuit diagram. Ask a proper new question for this different subject else it makes my answer look stupid and incomplete.
$endgroup$
– Andy aka
Dec 27 '18 at 13:55
$begingroup$
@DanielBashy please DO NOT evolve this current question the way you have by adding that new circuit diagram. Ask a proper new question for this different subject else it makes my answer look stupid and incomplete.
$endgroup$
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
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