參數(shù)資料
型號(hào)： UC2854AQTR
廠商： Texas Instruments, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Power Factor Controller
中文描述： 功率因數(shù)控制器
文件頁數(shù)： 1/16頁
文件大小： 455K
代理商： UC2854AQTR
SLUS329B JUNE 1998 REVISED FEBRUARY 2005
1
www.ti.com
FEATURES
Controls Boost PWM to Near-Unity Power
Factor
Limits Line Current Distortion To < 3%
World-Wide Operation Without Switches
Accurate Power Limiting
Fixed-Frequency Average Current-Mode
Control
High Bandwidth (5 MHz), Low-Offset Current
Amplifier
Integrated Current- and Voltage Amplifier
Output Clamps
Multiplier Improvements: Linearity, 500 mV
V
AC
Offset (Eliminates External Resistor), 0 V
to 5 V Multout Common-Mode Range
V
REF
GOOD Comparator
Faster and Improved Accuracy ENABLE
Comparator
UVLO Options (16 V/10 V or 10.5 V/10 V)
300-
μ
A Start-Up Supply Current
BLOCK DIAGRAM
DESCRIPTION
The UC3854A/B products are pin compatible
enhanced versions of the UC3854. Like the
UC3854, these products provide all of the
functions necessary for active power factor
corrected preregulators. The controller achieves
near unity power factor by shaping the AC input
line current waveform to correspond to the AC
input line voltage. To do this the UC3854A/B uses
average current mode control. Average current
mode control maintains stable, low distortion
sinusoidal line current without the need for slope
compensation, unlike peak current mode control.
A 1% 7.5 V reference, fixed frequency oscillator,
PWM, voltage amplifier with soft-start, line voltage
feedforward (V
RMS
squarer), input supply voltage
clamp, and over current comparator round out the
list of features.
Available in the 16-pin N (PDIP), DW (SOIC-
Wide), and J (CDIP) and 20-pin Q (PLCC)
package. See ordering information on page 3 for
availability by temperature range.
UDG03110
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
μ
A
I
MOUT
A
B
C
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Copyright
2003, Texas Instruments Incorporated
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