TK83854
HIGH POWER FACTOR PREREGULATOR
FEATURES (CONT.)
FEATURES
■ Control Boost PWM to 0.99 Power Factor
■ Limit Line Current Distortion to < 5%
■ Worldwide Operation without Switches
■ Feed-Forward Line Regulation
■ Low Noise Sensitivity
■ Low Start-Up Supply Current
■ Fixed-Frequency PWM Drive
■ Low-Offset Analog Multiplier/Divider
■ 1 Amp Totem-Pole Gate Driver
■ Precision Voltage Reference
■ Pin Compatible with UC2854, and UC3854
(Licensed Source)
DESCRIPTION
circuitry that supplies power to this device, the TK83854
family features low start-up supply current.
The TK83854 family of integrated circuits provide active
power factor correction for power systems that otherwise
would draw non-sinusoidal current from sinusoidal power
lines. These parts implement all the control functions
necessary to build a power supply preregulator capable of
optimally using available power-line current while
minimizing line-current distortion. To do this, the TK83854
contains a voltage amplifier, a precision analog multiplier/
divider, a current amplifier, and a fixed-frequency PWM. In
addition, the TK83854 contains a power MOSFET gate
driver, 7.5 V reference, line anticipator, load-enable
comparator, low supply detector, and overcurrent
comparator.
These devices are available in 16-pin plastic dual in-line
(DIP) and 16-pin surface mount (SOP) packages.
TK83854
GND
GTDRV
PKLMT
V
CC
CA
OUT
C
T
SOP-16
I
SS
SENSE
MULT
R
SET
OUT
IAC
TheTK83854familyusesaveragecurrent-modecontrolto
accomplish fixed-frequency current control with stability
and low distortion. Unlike peak current-mode control,
average current control accurately maintains sinusoidal
line current without slope compensation.
V
SENSE
83854
VA
ENA
OUT
V
V
ref
RMS
DIP-16
The TK83854's high reference voltage and high oscillator
amplitude minimize noise sensitivity while fast PWM
elements permit chopping frequencies above 200 kHz.
The TK83854 can be used in systems with line voltages
that vary from 75 to 275 V and with line frequencies across
the 50 Hz to 400 Hz range. To reduce the burden on the
BLOCK DIAGRAM
VA
MULT
CA
PKLMT
V
V
CC
OUT
OUT
OUT
ref
V
CC
IC POWER
7-5 V
REF
16/10 V
RUN
ENA
GT
DRV
2.5/2.25 V
7.5 V
AB
C
I
M
=
ORDERING INFORMATION
15 V
A
V
SENSE
IAC
B
C
TK83854
R
R
S
2
V
Q
X
RMS
14 µA
SS
Tape/Reel Code
RUN
OSC
Package Code
Extended Temp. Range
1
I
C
R
SET
GND
SENSE
T
TEMP. RANGE (OPTIONAL)
I: -40 TO +85
PACKAGE CODE
D: DIP-16
M: SOP-16
TAPE/REEL CODE
TL: Tape Left
MG: Magazine
C
January 1999 TOKO, Inc.
Page 1