下载
SLUS482B - APRIL 2001 − REVISED DECEMBER 2004
1
www.ti.com
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)
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
UDG-01009
VREF9
2
16
1
15
10
5
4
DRVOUT
GND
CAI
VCC
OVP/EN
VAOUT
1.9 V
PKLMT
7.5 V
REFERENCE
UVLO
10.2 V/9.7 V
VCC
3
OSCILLATOR
12
RT
14
CT
SQ
R
PWM
LATCH
+
−
PWM
CAOUT
+
−
+
−
+
−
VOLTAGE
ERROR AMP
8.0 V
7
11VSENSE
VFF
8
IAC
6
MOUT
MIRROR
2:1
X
2
+
−
ENABLE
OVP
÷
X
X
MULT
OSC
CLK
CLK
CURRENT
AMP
+
−
0.33 V
ZERO POWER
R
+
−
13VAI
Copyright 2004, Texas Instruments Incorporated
! " #$%! " &$'(#! )!%*
)$#!" # ! "&%##!" &% !+% !%" %," "!$%!"
"!)) -!.* )$#! &#%""/ )%" ! %#%""(. #($)%
!%"!/ (( &%!%"*
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.
D, DW, N, and PW PACKAGES
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
PKLMT
CAOUT
CAI
MOUT
IAC
VAOUT
VFF
DRVOUT
VCC
CT
VAI
RT
VSENSE
OVP/EN
VREF
