ą
D Controls Boost Preregulator to Near-Unity
Power Factor
D World Wide Line Operation D Over-Voltage Protection D Accur...
ą
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 Bi
CMOS Operation D 10.8-V to 17-V Operation D Programmable Output
Voltage (Tracking
Boost Topology)
UCC2819, UCC3819 PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR
SLUS482B - APRIL 2001 − REVISED DECEMBER 2004
D, DW, N, and PW PACKAGES (TOP VIEW)
GND PKLMT CAOUT
CAI MOUT
IAC VAOUT
VFF
1 2 3 4 5 6 7 8
16 DRVOUT 15 VCC 14 CT 13 VAI 12 RT 11 VSENSE 10 OVP/EN 9 VREF
description
The UCC2819/UCC3819 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 Bi
CMOS process, the UCC3819 offers new features such as lower start-up current, lower power dissipation, over
voltage protection, a shunt UVLO detect circuitry and a leading-edge modulation technique to reduce ripple current in the bulk capacitor.
The UCC3819 allows the output
voltage to be programmed by bringing out the error amplifier noninverting input.
Available in the 16-pin D, DW, N, and PW packages.
block diagram
VCC 15
OVP/...