Spice model for 6N139 [Design]

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From: Nik on 26 Jul 2010 07:54

>OBones wrote:
>> Joerg wrote:
>>> OBones wrote:
>>>> Hello all,
>>>> I'm looking for a SPICE model of the 6N139 and despite numerous hours

>>>> searching on the web, I could not find one.
>>>> If someone has such a model at hand, I would very much appreciate if
>>>> I could get a copy of it.
>>> On the files section of the Yahoo LTSpice group there is a 6N136 model

>>> if that helps.
>> Indeed, I could add a transistor to mimic the darlington stage. But then

>> again, which value should I use?
>Can't you measure one out, CTR and so on?
>Regards, Joerg

Hi ! I don't know if it will help, but I found a Hewlett-Packard
optoelectronics applications manual (c) 1977 which mentions (p 3.7) that
the LED => photo-diode CTR is ~0.0015 (~0.15%) across the range of similar
devices.

Looking at datasheet for the accessible base 6n136, 0.16% is quoted. This
suggests that we could use either figure for 6n139 with some confidence.

Collecting enough 6n139 Q1 & Q2 Hfe values to be statistically significant
is, of course, another matter...

Nik

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From: John Larkin on 26 Jul 2010 09:55

On Mon, 26 Jul 2010 06:54:04 -0500, "Nik"
<Nik_2213(a)n_o_s_p_a_m.yahoo.co.uk> wrote:

>>OBones wrote:
>>> Joerg wrote:
>>>> OBones wrote:
>>>>> Hello all,
>>>>> I'm looking for a SPICE model of the 6N139 and despite numerous hours
>
>>>>> searching on the web, I could not find one.
>>>>> If someone has such a model at hand, I would very much appreciate if
>>>>> I could get a copy of it.
>>>> On the files section of the Yahoo LTSpice group there is a 6N136 model
>
>>>> if that helps.
>>> Indeed, I could add a transistor to mimic the darlington stage. But then
>
>>> again, which value should I use?
>>Can't you measure one out, CTR and so on?
>>Regards, Joerg
>
>Hi ! I don't know if it will help, but I found a Hewlett-Packard
>optoelectronics applications manual (c) 1977 which mentions (p 3.7) that
>the LED => photo-diode CTR is ~0.0015 (~0.15%) across the range of similar
>devices.
>
>Looking at datasheet for the accessible base 6n136, 0.16% is quoted. This
>suggests that we could use either figure for 6n139 with some confidence.
>
>Collecting enough 6n139 Q1 & Q2 Hfe values to be statistically significant
>is, of course, another matter...
>
>Nik

We recently made our own optocouplers by epoxying an Osram
surface-mount IR LED to an Osram TO-92 photodiode. CTR is 23%.

John

From: Nik on 10 Aug 2010 19:03

"Collecting enough 6n139 Q1 & Q2 Hfe values to be statistically
significant
is, of course, another matter..."

;-)

FWIW, I've hooked the chips up to an Atlas component mini-analyser. There's
a slight drift in Beta (hFE) readings if repeated, but usually no more than
+/- 1%.

Number in sample = 25.

Mean = 101.1
Range 92 ~~110
SD(n-1) = 5.0
.......
Then, given the LED --> PhotoDiode CTR = ~0.0016 (~0.16%)
{OptoElectronics Applications Manual (c)1977 Hewlett-Packard p3.7 and their
6n136 model ;-}

With 6n139 LED cathode connected to Q2 emitter, and both collectors linked,
the Atlas accepted it as an odd darlington, reported the beta.
Mean = 7.3,
Range 6~~9.

Calculating each Q1 beta gave
Mean = 45.1
Range 37~~53
SD(n-1) = 3.6

Disclaimer: These are based on *single* measurements points per chip.
Collecting data over a range of LED currents and Vcc may give significantly
different results. I'll have to do that to get the Early voltage for Q2...

My head hurts...

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From: Nik on 10 Aug 2010 19:21

From: Nik on 10 Aug 2010 19:25

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