How much current does this Opto isolator output (HCPL-3180)?
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 Bashy
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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 Bashy
275
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Daniel Bashy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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 Bashy
275
New contributor
Daniel Bashy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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 Bashy
275
New contributor
Daniel Bashy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 27 '18 at 12:12
Daniel Bashy
275
New contributor
Daniel Bashy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Dec 27 '18 at 13:57
asked Dec 27 '18 at 12:12
Daniel Bashy
275
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Daniel Bashy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 27 '18 at 12:12
Daniel Bashy
275
asked Dec 27 '18 at 12:12
Daniel Bashy
275
275
New contributor
Daniel Bashy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Daniel Bashy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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Check out our Code of Conduct.
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1 Answer
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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 aka
239k10176408
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
– Daniel Bashy
Dec 27 '18 at 12:45
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
– Daniel Bashy
Dec 27 '18 at 12:53
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.
– Andy aka
Dec 27 '18 at 12:59
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
– Daniel Bashy
Dec 27 '18 at 13:10
1
@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.
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
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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 aka
239k10176408
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
– Daniel Bashy
Dec 27 '18 at 12:45
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
– Daniel Bashy
Dec 27 '18 at 12:53
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.
– Andy aka
Dec 27 '18 at 12:59
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
– Daniel Bashy
Dec 27 '18 at 13:10
1
@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.
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
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 aka
239k10176408
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
– Daniel Bashy
Dec 27 '18 at 12:45
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
– Daniel Bashy
Dec 27 '18 at 12:53
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.
– Andy aka
Dec 27 '18 at 12:59
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
– Daniel Bashy
Dec 27 '18 at 13:10
1
@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.
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
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 aka
239k10176408
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 aka
239k10176408
edited Dec 27 '18 at 12:56
answered Dec 27 '18 at 12:44
Andy aka
239k10176408
answered Dec 27 '18 at 12:44
Andy aka
239k10176408
answered Dec 27 '18 at 12:44
Andy aka
239k10176408
239k10176408
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
– Daniel Bashy
Dec 27 '18 at 12:45
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
– Daniel Bashy
Dec 27 '18 at 12:53
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.
– Andy aka
Dec 27 '18 at 12:59
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
– Daniel Bashy
Dec 27 '18 at 13:10
1
@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.
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
– Daniel Bashy
Dec 27 '18 at 12:45
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
– Daniel Bashy
Dec 27 '18 at 12:53
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.
– Andy aka
Dec 27 '18 at 12:59
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
– Daniel Bashy
Dec 27 '18 at 13:10
1
@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.
– Andy aka
Dec 27 '18 at 13:55
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
– Daniel Bashy
Dec 27 '18 at 12:45
thats the peak current , I wanted to know the average current which will be fed to the MOSFET
– Daniel Bashy
Dec 27 '18 at 12:45
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
– Daniel Bashy
Dec 27 '18 at 12:53
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
– Daniel Bashy
Dec 27 '18 at 12:53
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.
– Andy aka
Dec 27 '18 at 12:59
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.
– Andy aka
Dec 27 '18 at 12:59
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
– Daniel Bashy
Dec 27 '18 at 13:10
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
– Daniel Bashy
Dec 27 '18 at 13:10
1
1
@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.
– Andy aka
Dec 27 '18 at 13:55
@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.
– Andy aka
Dec 27 '18 at 13:55
|
show 13 more comments
Daniel Bashy is a new contributor. Be nice, and check out our Code of Conduct.
Daniel Bashy is a new contributor. Be nice, and check out our Code of Conduct.
Daniel Bashy is a new contributor. Be nice, and check out our Code of Conduct.
Daniel Bashy is a new contributor. Be nice, and check out our Code of Conduct.
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