UCC2817, UCC2818, UCC3817, UCC3818
BiCMOS POWER FACTOR PREREGULATOR
SLUS395E - FEBRUARY 2000 - REVISED APRIL 2001
D
Controls Boost Preregulator to Near-Unity
D
D
D
D
D
D
D
D
D
D
D
Power Factor
Limits Line Distortion
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
12-V to 17-V Operation
D, DW, and N PACKAGES
(TOP VIEW)
GND
PKLMT
CAOUT
CAI
MOUT
IAC
VAOUT
VFF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
DRVOUT
VCC
CT
SS
RT
VSENSE
OVP/EN
VREF
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.
block diagram
VCC
15
OVP/EN
10
16 V (FOR UCC2817 ONLY)
7.5 V
REFERENCE
9
VREF
SS
13
1.9 V
–
+
ZERO POWER
0.33 V
CURRENT
AMP
–
+
–
+
OSC
MIRROR
2:1
CLK
–
+
8.0 V
+
–
PWM
S
Q
PWM
LATCH
R
R
1
CLK
GND
16
DRVOUT
OVP
X
÷
MULT
X
X2
ENABLE
UVLO
16 V/10 V (UCC2817)
10.5 V/10 V (UCC2818)
VCC
VAOUT
7
VSENSE
11
7.5 V
–
+
VOLTAGE
ERROR AMP
VFF
8
IAC
MOUT
6
5
4
CAI
3
CAOUT
OSCILLATOR
–
+
2
PKLMT
12
RT
14
CT
UDG-98182
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.
Copyright
2001, Texas Instruments Incorporated
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•
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1
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