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UCC28019P Datasheet(PDF) 39 Page - Texas Instruments

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Part # UCC28019P
Description  8-Pin Continuous Conduction Mode (CCM) PFC Controller
PDF  48 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC28019P Datasheet(HTML) 39 Page - Texas Instruments

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1
2
ZERO
VCOMP
VCOMP
f
R
C
p
=
1
2
POLE
VCOMP
VCOMP
VCOMP _ P
VCOMP
VCOMP _ P
f
R
C
C
C
C
p
=
+
(
)
1
1
VCOMP
VCOMP
EA
VCOMP
VCOMP
VCOMP _ P
VCOMP
VCOMP _ P
VCOMP
VCOMP _ P
s( f )R
C
G ( f )
gmv
R
C
C
C
C
s( f )
s( f )
C
C
é
ù
ê
ú
ê
ú
+
=
ê
ú
é
ù
æ
ö
ê
ú
+
+
ê
ú
ç
÷
ê
ú
ç
÷
+
ê
ú
è
ø
ë
û
ë
û
10
V
f
Hz
=
20
10
2
G
( f )
VLdB
V
PWM _ PS
VCOMP
V
f
gmv
f
C
f
p
=
´
0 709
20
10
42
1 589
3 88
10
2
10
.
dB
VCOMP
Hz
S
.
Hz
C
.
F
Hz
m
m
p
´
=
=
´ ´ ´
1
2
VCOMP
ZERO
VCOMP
R
f
C
p
=
1
30 36
2
1 589
3 3
VCOMP
R
.
k
.
Hz
.
F
p
m
=
=
W
´ ´
´
2
1
VCOMP
VCOMP _ P
POLE
VCOMP
VCOMP
C
C
f
R
C
p
=
-
3 3
0 258
2
20
33
3 3
1
VCOMP _ P
.
F
C
.
F
Hz
k
.
F
m
m
p
m
=
=
´ ´
´
W ´
-
UCC28019
SLUS755 – APRIL 2007
The voltage error amplifier is compensated with a zero, f
ZERO, at the fPWM_PS pole and a pole, fPOLE, placed at 20
Hz to reject high frequency noise and roll off the gain amplitude. The overall voltage loop crossover, f
V, is
desired to be at 10 Hz. The compensation components of the voltage error amplifier are selected accordingly.
From Figure 31, and the Design Calculator spreadsheet, the open loop gain of the voltage transfer function at 10
Hz is approximately 0.709 dB. Estimating that the parallel capacitor, CVCOMP_P, is much smaller than the series
capacitor, CVCOMP, the unity gain will be at fV, and the zero will be at fPWM_PS, the series compensation capacitor
is determined:
A 3.3-
µF capacitor is used for C
VCOMP.
A 33-k
Ω resistor is used for R
VCOMP.
A 0.22-
µF capacitor is used for C
VCOMP_P.
39
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