TK83854 Datasheet, PDF (1/12 Pages) TOKO, Inc – HIGH POWER FACTOR PREREGULATOR

TK83854
HIGH POWER FACTOR PREREGULATOR
FEATURES
s Control Boost PWM to 0.99 Power Factor
s Limit Line Current Distortion to < 5%
s Worldwide Operation without Switches
s Feed-Forward Line Regulation
s Low Noise Sensitivity
s Pin Compatible with UC2854, and UC3854
(Licensed Source)
DESCRIPTION
FEATURES (CONT.)
s Low Start-Up Supply Current
s Fixed-Frequency PWM Drive
s Low-Offset Analog Multiplier/Divider
s 1 Amp Totem-Pole Gate Driver
s Precision Voltage Reference
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.
The TK83854 family uses average current-mode control to
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.
circuitry that supplies power to this device, the TK83854
family features low start-up supply current.
These devices are available in 16-pin plastic dual in-line
(DIP) and 16-pin surface mount (SOP) packages.
83854
SOP-16
83854
DIP-16
TK83854
GND
PKLMT
CAOUT
ISENSE
MULTOUT
IAC
VAOUT
VRMS
GTDRV
VCC
CT
SS
RSET
VSENSE
ENA
Vref
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
ORDERING INFORMATION
TK83854
Package Code
Tape/Reel Code
Extended Temp. Range
BLOCK DIAGRAM
VCC
16/10 V
ENA
2.5/2.25 V
7.5 V
VSENSE
IAC
VRMS
SS
14 µA
VAOUT MULTOUT CAOUT PKLMT
Vref
VCC
IM =
AB
C
A
7-5 V
REF
RUN
IC POWER
15 V
GTDRV
B
X2
C
RUN
OSC
R
RQ
S
PACKAGE CODE
D: DIP-16
M: SOP-16
TEMP. RANGE (OPTIONAL)
I: -40 TO +85 C
TAPE/REEL CODE
TL: Tape Left
MG: Magazine
January 1999 TOKO, Inc.
ISENSE
CT RSET
1
GND
Page 1