UCC2819A Datasheet, PDF (1/21 Pages) Texas Instruments – PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR

UCC2819A
UCC3819A
ą
SLUS579 − OCTOBER, 2003
PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR
FEATURES
D Controls Boost Preregulator to Near-Unity
Power Factor
D World Wide Line Operation
D Over-Voltage Protection
D Accurate Power Limiting
D Average Current Mode Control
D Improved Noise Immunity
D Improved Feed-Forward Line Regulation
D Leading Edge Modulation
D 150-µA Typical Start-Up Current
D Low-Power BiCMOS Operation
D 10.8-V to 17-V Operation
D Programmable Output Voltage (Tracking
Boost Topology)
BLOCK DIAGRAM
OVP/EN 10
DESCRIPTION
The UCC2819A/UCC3819A provides all 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 that of the
ac-input line voltage. Average current mode
control maintains stable, low distortion sinusoidal
line current.
Designed in Texas Instrument’s BiCMOS process,
the UCC3819A offers new features such as lower
start-up current, lower power dissipation,
overvoltage protection, a shunt UVLO detect
circuitry and a leading-edge modulation technique
to reduce ripple current in the bulk capacitor.
The UCC3819A allows the output voltage to be
programmed by bringing out the error amplifier
noninverting input.
VCC
15
7.5 V
REFERENCE
9 VREF
VAOUT 7
VSENSE 11
VAI 13
VFF 8
IAC 6
MOUT 5
VOLTAGE
− ^{ERROR AMP}
+
X2
÷^X _MULT
X
MIRROR
2:1
1.9 V −
+
0.33 V
CURRENT
AMP
−
+
ENABLE
ZERO POWER
−
+
8.0 V + OVP
−
− ^PWM
+
OSC
CLK
SQ
PWM
LATCH
RR
CLK
OSCILLATOR
UVLO
10.2 V/9.7 V
VCC
16 DRVOUT
1 GND
−
2 PKLMT
+
4
3
12 14
CAI
CAOUT RT CT
UDG-03124
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
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Copyright  2003, Texas Instruments Incorporated
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