UCC2817L Datasheet, PDF (1/31 Pages) Texas Instruments – BCMOS POWER FACTOR PREREGULATOR

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UCC2817, UCC2818, UCC3817, UCC3818
BiCMOS POWER FACTOR PREREGULATOR
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
SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009
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 SS
12 RT
11 VSENSE
10 OVP/EN
9 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.
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
VCC
15
OVP/EN 10
SS 13
VAOUT 7
VSENSE 11
7.5 V
VFF 8
VOLTAGE
− ^{ERROR AMP}
+
X2
X
÷ MULT
X
MIRROR
2:1
IAC 6
MOUT 5
16 V (FOR UCC2817 ONLY)
7.5 V
REFERENCE
9 VREF
1.9 V −
+
0.33 V
CURRENT
AMP
−
+
ENABLE
ZERO POWER
−
+
8.0 V + OVP
−
− ^PWM
+
OSC
CLK
SQ
PWM
LATCH
RR
UVLO
16 V/10 V (UCC2817)
10.5 V/10 V (UCC2818)
VCC
CLK
OSCILLATOR
−
+
16 DRVOUT
1 GND
2 PKLMT
4
3
12 14
CAI
CAOUT RT CT
UDG-98182
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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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