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參數(shù)資料
| 型號(hào)： | AND8112 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | A Quasi-Resonant SPICE Model Eases Feedback Loop Designs |
| 中文描述： | 阿準(zhǔn)諧振SPICE模型反饋環(huán)的設(shè)計(jì)更易 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 205K |
| 代理商： | AND8112 |
AND8112/D
http://onsemi.com
10
4
R1
1 k
dem
11
5
1
14
12
Resr1
60 m
15
17
6
21
31
X4
XFMRAUX
RATIO_POW = 0.06
RATIO_AUX = 0.06
9
24
18
D4
BV = 15.6
dem
fb
Feedback
R6
100
C6
100 p
fb
3
X2
PSW1
1
2
3
4
5
8
7
6
FreeRun
X1
FreeRunDT
t
off(min)
= 1
13
R5
10 m
16
R7
150 m
D1
MBR20100CT
X5
SFH615AGR
V3
120
AC =
Simplified simulation of a
NCP1207based board
7
X3
PSW1
V1
Figure 12. This Simplified Transient Model Will Help to Check the Averaged Results
L
leak
1 p
R
prim
0.5
V
Coil
C5
1 n
V
out
R
led
1 k
V
drain
C
reso
10 p
I
Reso
I
coil
L
prim
1.2 m
C
out1
1 mF
I
C
= 16.5
R
sense
0.5
+
I
D
V
out
V
out
I
out
I
Diode
L3
2.2
+
C1
220
I
C
= 16.5
2.57 m
3.11 m
3.65 m
4.19 m
4.73 m
16.80
16.82
16.84
16.86
16.88
Figure 13. Audio Susceptibility with a Line Step
(200 to 350 V)
CyclebyCycle V
out
Averaged V
out
Figure 14.
Comparison Between Models (50 to 0.5 )
and Load Step Response
2.48 m
3.04 m
3.60 m
4.16 m
4.72 m
16.55
16.65
16.75
16.85
16.95
CyclebyCycle V
out
= 20 mV
Averaged V
out
Real World Confrontation
Even if the above paragraph gives us the assumption that
our model sticks to reality quite well, nothing replaces a real
board measurement with a network analyzer. However, on
the NCP1207, the collector of the optocoupler is directly
internally pulledup to a reference via a resistor, it thus
becomes difficult to open the loop via the series transformer
method. We thus went back to a simple openloop
configuration where a DC source fixes the expected
operating point. It does not cause any problem in our case
since the overall gain V
control
to V
out
is low. The AC
injection is then made via a 1000 F capacitor. Figure 15
depicts the adopted configuration on the bench, but also
replicated on the averaged model.
1
3
1
2
3
4
5
8
7
6
4
5
NCP1207
Figure 15.
R
sense
R3
1 k
V
bias
1.57
V
stim
AC = 1
C1
1000
The AC measurement is obtained once the proper
operating point is reached by adjusting V
bias
. The gain being
low, there is no problem of output runaway as long as V
bias
is slowly increased.
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相關(guān)代理商/技術(shù)參數(shù) |
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| AND8139 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Ultra-Low Voltage MiniGate Devices Solve 1.2 V Interface Problems |
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