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UCC28056CDBVT Datasheet(PDF) 16 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) 16 Page - Texas Instruments

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u
InMinPkL
InMax
InEqMin
V
P
2 R
u
u G
BST
InEq
ON
ONDCH
2 L
R
T
T
T
T
T u G
T
T
T
u
T u
T
u
LPkS
ON
DCH
ON
ONDCH
In
LAvS
In
PER
BST
InEq
I
T
T
T
V
I
V
2
T
2 L
R
u BST
InEq
ON
2 L
R
T
T
T
T
T
D u
u
LPkS
ON
In
LAvS
In
BST
InEq
I
T
V
I
V
2
2 L
R
ILPkS( )
ILPkS( )
IL( , t)
IL( , t)
ILAvS( )
ILAvS( )
CrM Operation
DCM Operation
TON( )
TDCH( )
TPER( )
TON( )
TDCH( )
TPER( )
TDCM
16
UCC28056
SLUSD37E – OCTOBER 2017 – REVISED NOVEMBER 2019
www.ti.com
Product Folder Links: UCC28056
Submit Documentation Feedback
Copyright © 2017–2019, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 CrM/DCM Control Principle
Figure 19. PFC Inductor Current Waveform for CrM and DCM Operation
Consider a single switching cycle that occurs at angle (θ) during the Line Cycle. Assuming ideal CrM operation
the average inductor current (ILAvS(θ)) that flows during the switching cycle is given by:
(1)
A fixed circuit has constant inductance (LBST), so if the switch ON duration (TON(θ)) holds constant (TON) , across
the Line Cycle, then the average input current remains proportional to the input voltage. In other words, when
controlled in this way, the Boost converter behaves as a resistive load (RInEq) connected across the Line.
(2)
the next step is to consider DCM operation. Equation 3 describes the average inductor current that flows during
the switching cycle.
(3)
To ensure average input current proportional to input voltage it is necessary for the on-time product TON(θ) x
δONDCH(θ) is kept constant across the Line Cycle. Equation 4 shows the equivalent input resistance.
(4)
The minimum effective input resistance (RInEqMin) is needed to draw maximum power (PInMax) from minimum Line
voltage (VInMinPkL):
(5)



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