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UCC28056CDBVT Datasheet(PDF) 31 Page - Texas Instruments

Part # UCC28056CDBVT
Description  UCC28056 6-Pin Single-Phase Transition-Mode PFC Controller
PDF  55 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

UCC28056CDBVT Datasheet(HTML) 31 Page - Texas Instruments

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background image
u
u
OutMax
LRMSMax
InRMSMin
110%
P
2
I
2.5 A
V
3
S
u
T
T
u
S ³
2
InRMS
LRMS
LRMS
InEq
0
V
1
2
I
I
d
R
3
T
u
T
T
u
u
T
LPkS
LAvS
InPkL
LRMS
InEqMin
I
2 I
V
2
I
sin
R
3
3
3
IL(t, )
t
0
0
Œ
ILPkS( )
ILRMS( )
ILAvS( )
ILPkS( )
ILRMS( )
ILAvS( )
TON
TDCH( )
31
UCC28056
www.ti.com
SLUSD37E – OCTOBER 2017 – REVISED NOVEMBER 2019
Product Folder Links: UCC28056
Submit Documentation Feedback
Copyright © 2017–2019, Texas Instruments Incorporated
Figure 27. Ideal Transition Mode (CrM) Inductor Current
Equation 25 describes the he Boost inductor RMS current over a single switching cycle, at angle θ through the
Line half-cycle.
(25)
Equation 26 describes the Boost inductor RMS current over a complete Line cycle.
(26)
Maximum Boost inductor RMS current occurs at minimum Line voltage and maximum input power.
(27)
Based upon the inductor requirements, a custom magnetic can be designed, or a suitable catalogue controller
selected.
Table 2. Inductor Requirements
Description
Value
Unit
Inductance
200
µH
RMS Current
2.5
A
Saturation Current
8.8
A
9.2.2.2.2
Boost Switch Selection
The power switch carries the Boost inductor current during its ON period (TON). It carries no current during its
OFF period (TDCH). Equation 28 describes the switch RMS current, over a single switching cycle, at angle θ in the
Line half-cycle.



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