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UCC3817DW Datasheet(PDF) 1 Page - Texas Instruments

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Part # UCC3817DW
Description  BCMOS POWER FACTOR PREREGULATOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC3817DW Datasheet(HTML) 1 Page - Texas Instruments

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UCC2817, UCC2818, UCC3817, UCC3818
BiCMOS POWER FACTOR PREREGULATOR
SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009
1
www.ti.com
D Controls Boost Preregulator to Near-Unity
Power Factor
D Limits Line Distortion
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 12-V to 17-V Operation
D Frequency Range 6 kHz to 220 kHz
description
The UCCx817/18 family 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 UCC2817/UCC2818 offers new features such as lower
start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge
modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset (
±2 mV) current
amplifier to reduce distortion at light load conditions.
block diagram
UDG-98182
VREF
9
2
16
1
15
10
5
4
DRVOUT
GND
CAI
VCC
OVP/EN
VAOUT
1.9 V
PKLMT
7.5 V
REFERENCE
UVLO
16 V/10 V (UCC2817)
10.5 V/10 V (UCC2818)
VCC
3
OSCILLATOR
12
RT
14
CT
SQ
R
PWM
LATCH
+
PWM
CAOUT
+
+
+
SS
VOLTAGE
ERROR AMP
8.0 V
13
7
11
VSENSE
VFF
8
IAC
6
MOUT
MIRROR
2:1
X2
+
7.5 V
ENABLE
OVP
÷
X
X
MULT
OSC
CLK
CLK
CURRENT
AMP
16 V (FOR UCC2817 ONLY)
+
0.33 V
ZERO POWER
R
+
Copyright
 2006 − 2009, Texas Instruments Incorporated
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.
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
SS
RT
VSENSE
OVP/EN
VREF


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