The UCC28019 8-pin active Power Factor Correction (PFC) controller uses the boost topology operating in Continuous Conduction Mode (CCM)

UCC28019

Manufacturer Part NumberUCC28019
DescriptionThe UCC28019 8-pin active Power Factor Correction (PFC) controller uses the boost topology operating in Continuous Conduction Mode (CCM)
ManufacturerTexas Instruments
UCC28019 datasheet
 


Specifications of UCC28019

Uvlo Thresholds On/off(v)10.5/9.5Operating Supply(max)(v)22
Startup Current(ma)0.1Operating Supply Current(ma)7
Vref(v)5Vref Tol(%)2
Duty Cycle(max)(%)99.3Practical Operating Frequency(max)(mhz)0.65
Pin/package8PDIP, 8SOIC  
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UCC28019
SLUS755B – APRIL 2007 – REVISED DECEMBER 2007
Boost Inductor
The boost inductor, L
, is selected after determining the maximum inductor peak current, I
BST
I
RIPPLE
I
I
=
+
L _ PEAK (max)
IN _ PEAK (max)
2
.
A
1 28
I
6 39
.
A
7 03
=
+
=
L _ PEAK (max)
2
The minimum value of the boost inductor is calculated based upon a worst case duty cycle of 0.5:
V
D(
D )
1
-
OUT
L
³
BST (min)
f
I
SW ( typ ) RIPPLE
390
V
´
0 5 1 0 5
. (
-
. )
L
³
³
BST (min)
65
kHz
´
1 28
.
A
The actual value of the boost inductor that will be used is 1.25 mH.
The maximum duty cycle, DUTY
(max)
V
V
-
OUT
IN _ RECTIFIED(min)
DUTY
=
(max)
V
OUT
V
=
2 85
´
V
=
120
IN _ RECTIFIED(min)
390
V
120
V
-
DUTY
0 692
.
=
=
(max)
V
390
Boost Diode
The diode losses are estimated based upon the forward voltage drop, V
charge, Q
, of the diode. Using a silicone carbide diode, although more expensive, will essentially eliminate the
RR
reverse recovery losses:
P
V
I
0 5
. f
=
+
DIODE
F _
C OUT (max)
SW ( typ ) OUT
125
V
. V
1 5
=
F _
125
C
Q
0
nC
=
RR
P
. V
.
A
.
=
1 5
´
0 897
+
0 5 65
´
DIODE
28
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.
A
. mH
1 17
, can be calculated and will occur at the minimum input voltage:
V
V
Q
RR
kHz
V
nC
. W
´
390
´
0
=
1 35
Product Folder Link(s):
UCC28019
www.ti.com
:
L_PEAK(max)
, at 125 C and the reverse recovery
F
Copyright © 2007, Texas Instruments Incorporated