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UC2854B-EP Fiches technique(PDF) 10 Page - Texas Instruments

No de pièce UC2854B-EP
Description  UC2854B-EP Advanced High-Power Factor Preregulator
Download  36 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2854B-EP Fiches technique(HTML) 10 Page - Texas Instruments

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¹
UDG−03110
10
11
6
8
15
1
16
ENA
VSENSE
IAC
VRMS
VCC
GND
GTDRV
2.65 V / 2.15 V
3 V
7
VAO
13
SS
X2
A
B
C
(A) 16 V / 10 V
(B) 10.5 V / 10 V
5
MOUT
4
ISENSE
3
CAO
14
CT
OSC
12
RSET
S
Q
R
R
2
PKLMT
20 V
IC
POWER
7.5 V REF
9
REF
RUN
7.1 V
RUN
VCC
14 µA
I
MOUT
A
B
C
UC2854B-EP
SGLS318A – NOVEMBER 2005 – REVISED NOVEMBER 2015
www.ti.com
8 Detailed Description
8.1 Overview
The objective of active power factor correction is to make the input to a power supply look like a simple resistor.
An active power factor corrector does this by programming the input current in response to the input voltage. As
long as the ratio between the voltage and current is a constant the input will be resistive and the power factor will
be 1.0. When the ratio deviates from a constant the input will contain phase displacement, harmonic distortion or
both and either one will degrade the power factor. UC3854 configured as a boost converter can be used to meet
the system needs.
A boost regulator is an excellent choice for the power stage of an active power factor corrector because the input
current is continuous and this produces the lowest level of conducted noise and the best input current waveform.
The disadvantage of the boost regulator is the high output voltage required. The output voltage must be greater
than the highest expected peak input voltage.
The boost regulator input current must be forced or programmed to be proportional to the input voltage waveform
for power factor correction. Feedback is necessary to control the input current and either peak current mode
control or average current mode control may be used. Both techniques may be implemented with the UC3854.
8.2 Functional Block Diagram
8.3 Feature Description
The UC2854B is designed as a pin compatible upgrade to the industry standard UC2854 active power factor
correction circuits. The circuit enhancements allow the user to eliminate in most cases several external
components currently required to successfully apply the UC2854. In addition, linearity improvements to the
multiply, square and divide circuitry optimizes overall system performance. Detailed descriptions of the circuit
enhancements are provided below. For in-depth design applications reference data see the application notes,
UC2854 Controlled Power Factor Correction Circuit Design (SLUA144) and UC2854A and UC2854B Advanced
Power Factor Correction Control ICs (SLUA177).
8.3.1 Multiply/Square and Divide
The UC2854B multiplier design maintains the same gain constant
as the UC2854. The relationship
between the inputs and output current is given as:
10
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Product Folder Links: UC2854B-EP


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