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UC2854AQ Datasheet

  • UC2854AQ

  • ADVANCED HIGH-POWER FACTOR PREREGULATOR

  • 16頁

  • TI

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UC1854B
UC2854A, UC2854B
UC3854A, UC3854B
SLUS329B 鈭?JUNE 1998 鈭?REVISED FEBRUARY 2005
ADVANCED HIGH POWER FACTOR
PREREGULATOR
FEATURES
D
Controls Boost PWM to Near-Unity Power
D
D
D
D
D
D
D
D
D
D
D
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-碌A(chǔ) Start-Up Supply Current
VAO
7
VCC
(A) 16 V / 10 V
(B) 10.5 V / 10 V
ENA 10
2.65 V / 2.15 V
3V
VSENSE 11
IAC 6
VRMS
8
X2
A
B
C
RUN
I
MOUT
+
A
B
C
OSC
20 V
1 GND
R
R
S Q
MOUT
5
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.
CAO PKLMT
3
2
REF
9
7.5 V REF
RUN
IC
POWER
7.1 V
15 VCC
BLOCK DIAGRAM
16 GTDRV
14
碌A(chǔ)
SS 13
4
ISENSE
14
CT
12
RSET
UDG鈭?3110
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
錚?/div>
2003, Texas Instruments Incorporated
www.ti.com
1

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