UCC2818A-Q1_15 Datasheet, PDF (1/28 Pages) Texas Instruments – BiCMOS ADVANCED PHASE-SHIFT PWM CONTROLLER

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UCC2818A-Q1
SLUSA21A – FEBRUARY 2010 – REVISED DECEMBER 2014
UCC2818A-Q1 BiCMOS Power-Factor Preregulator
1 Features
•1 Qualified for Automotive Applications
• Controls Boost Preregulator to Near-Unity Power
Factor
• Limits Line Distortion
• World-Wide Line Operation
• Overvoltage 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
• Frequency Range of 6 kHz to 220 kHz
2 Applications
• Automotive
3 Description
The UCC2818A-Q1 device 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 UCC2818A-Q1 device 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.
The UCC2818A-Q1 PFC controller is directly pin-for-
pin compatible with the UCC2818 devices. Only the
output stage of UCC2818A-Q1 device has been
modified to allow use of a smaller external gate drive
resistor values. For some power supply designs
where an adequately high enough gate drive resistor
can not be used, the UCC2818A-Q1 device offers a
more robust output stage at the cost of increasing the
internal gate resistances. The gate drive of the
UC2818A, however, remains strong at ±1.2 A of peak
current capability.
The UCC2818A-Q1 device is intended for
applications with a fixed supply (V_CC). It is available in
the 16-pin D package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC2818A-Q1
SOIC (16)
9.90 mm × 3.91 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
OVP/EN 10
SS 13
VAOUT 7
VSENSE 11
7.5 V
VFF 8
Voltage
− ^{Error Amplifier}
+
X²
X
P Mult
X
Mirror
2:1
IAC 6
MOUT 5
Block Diagram
VCC
15
16 V (For UCC2817 Only)
7.5-V
Reference
9 VREF
1.9 V −
+
0.33 V
Current
Amplifier
−
+
ENABLE
Zero Power
−
+
8V
− ^PWM
+
OSC
CLK
+ OVP
−
SQ
PWM
Latch
RR
UVLO
16 V/10 V (UCC2817)
10.5 V/10 V (UCC2818)
Oscillator
CLK
VCC
−
+
16 DRVOUT
1 GND
2 PKLMT
4
3
12
14
CAI
CAOUT RT CT
UDG-98182
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.