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UCC3819ADTEXAS ?N/a2480avaiBiCMOS Power Factor Preregulator
UCC3819ADG4TEXASN/a2480avaiBiCMOS Power Factor Preregulator 16-SOIC 0 to 70


UCC3819AD ,BiCMOS Power Factor PreregulatorELECTRICAL CHARACTERISTICST = 0°C to 70°C for the UCC3819A, −40°C to 85°C for the UCC2819A, VCC = 1 ..
UCC3819ADG4 ,BiCMOS Power Factor Preregulator 16-SOIC 0 to 70ELECTRICAL CHARACTERISTICST = 0°C to 70°C for the UCC3819A, −40°C to 85°C for the UCC2819A, VCC = 1 ..
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UCC3819AD-UCC3819ADG4
BiCMOS Power Factor Preregulator
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SLUS579 − OCTOBER, 2003
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FEATURES
Controls Boost Preregulator to Near-Unity
Power Factor
World Wide Line Operation Over-Voltage Protection Accurate Power Limiting Average Current Mode Control Improved Noise Immunity Improved Feed-Forward Line Regulation Leading Edge Modulation 150-µA Typical Start-Up Current Low-Power BiCMOS Operation 10.8-V to 17-V Operation Programmable Output Voltage (Tracking
Boost Topology)
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 T exas 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.

BLOCK DIAGRAM

UDG-03124
VREF
DRVOUT
GND
CAI
VCC
OVP/EN
VAOUT
PKLMT
VCC
CAOUTVSENSE
VFF
IAC
MOUTVAI
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.
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