UCC2819_16 Datasheet, PDF (1/16 Pages) Texas Instruments – PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR

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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)
UCC2819, UCC3819
PROGRAMMABLE OUTPUT
POWER FACTOR PREREGULATOR
SLUS482B - APRIL 2001 − REVISED DECEMBER 2004
D, DW, N, and PW PACKAGES
(TOP VIEW)
GND 1
PKLMT 2
CAOUT 3
CAI 4
MOUT 5
IAC 6
VAOUT 7
VFF 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 BiCMOS process, the UCC3819 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 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/EN 10
7.5 V
REFERENCE
9 VREF
VAOUT 7
VSENSE 11
VAI 13
VFF 8
IAC 6
MOUT 5
VOLTAGE
− ^{ERROR AMP}
+
÷^X _MULT
X
X2
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
4
3 12 14
CAI
CAOUT RT CT
VCC
16 DRVOUT
1 GND
−
2 PKLMT
+
UDG-01009
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  2004, Texas Instruments Incorporated
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