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
Sense Resistor
To accommodate the gain of the internal non-linear power limit, R
over-current at 25% higher than the maximum peak inductor current using the minimum SOC threshold, V
ISENSE.
V
SOC
R
=
SENSE
I
´
1 25
.
L _ PEAK (max)
. V
0 66
R
=
=
0 075
.
W
SENSE
.
A
.
7 03
´
1 25
Using a parallel combination of available standard value resistors, the sense resistor is chosen.
R
0 067
.
=
W
SENSE
The power dissipated across the sense resistor, P
2
P
I
R
=
Rsense
IN
RMS
SENSE
_
(max)
2
P
=
( .
4 52
A )
´
0 067
.
W =
1 36
. W
Rsense
The peak current limit, PCL, protection feature will be triggered when current through the sense resistor results in
the voltage across R
to be equal to the V
SENSE
threshold is used:
V
PCL
I
=
PCL
R
SENSE
1 15
. V
I
.
A
17 16
=
=
PCL
0 067
.
W
To protect the device from inrush current, a standard 220-Ω resistor, R
pin. A 1000-pF capacitor is placed close to the device to improve noise immunity on the ISENSE pin.
30
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, is sized such that it will trigger the soft
SENSE
, must be calculated:
Rsense
threshold. For a worst case analysis, the maximum V
PCL
, is placed in series with the ISENSE
ISENSE
Product Folder Link(s):
UCC28019
www.ti.com
, of
SOC
PCL
Copyright © 2007, Texas Instruments Incorporated