AND8327/D
2.5 V
L1
1 kH
Vdd
5.0 V
4.99 V
4
+
-
FB
10
5
9
4.99 V
+
2.5 V
Rled
1 k
R2
10 k
C3
1 kF
X3
AMPSIMP
8
Rpullup
20 k
+
V2
2.5
3
7
1
FB
2.49 V
4.86 V
0 V
+
VFB
X1
Optocoupler
2.5 V
Vsweep
AC = 1
C2
10 n
3.78 V
C1 100 nF
6
U1
TL431
R3
10 k
Figure 6. The Type 2 Compensator Based on a TL431 and
Adapted for a SPICE Simulation
1
2
ph_vfb
vdbfb
60.0
40.0
20.0
0
Loop gain (dB)
23 dB
1
-20.0
150
130
110
Phase (°)
41°
90.0
70.0
2
10
100
1k
frequency in hertz
10k
100k
Figure 7. ac Results of the Type 2 Compensator,
Highlighting the Presence of Two Poles and One Zero
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4
ETC [ ETC ]
