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TI-UC2854B-EP.pdf
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UDG−03110
10
11
6
8
15
1
16
ENA
VSENSE
IAC
VRMS
VCC
GND
GTDRV
2.65 V / 2.15 V
3 V
7
VAO
13
SS
X
2
A
B
C
(A) 16 V / 10 V
(B) 10.5 V / 10 V
5
MOUT
4
ISENSE
3
CAO
14
CT
OSC
12
RSET
S Q
R
R
2
PKLMT
20 V
IC
POWER
7.5 V REF
9
REF
RUN
7.1 V
RUN
V
CC
14 µA
I
MOUT
A B
C
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UC2854B-EP
SGLS318A –NOVEMBER 2005–REVISED NOVEMBER 2015
UC2854B-EP Advanced High-Power Factor Preregulator
1 Features Comparator
• UVLO Options (16 V/10 V or 10.5 V/10 V)
1
• Controlled Baseline
• 300-μA Start-Up Supply Current
– One Assembly/Test Site, One Fabrication Site
• Extended Temperature Performance of −55°C to
2 Applications
125°C
Industrial Lighting
• Enhanced Diminishing Manufacturing Sources
(DMS) Support
3 Description
• Enhanced Product-Change Notification
The UC2854B products are pin compatible enhanced
• Qualification Pedigree
versions of the UC2854. Like the UC2854, these
products provide all of the functions necessary for
(1)
Component qualification in accordance with JEDEC and
industry standards to ensure reliable operation over an
active power factor corrected preregulators. The
extended temperature range. This includes, but is not limited
controller achieves near unity power factor by
to, Highly Accelerated Stress Test (HAST) or biased 85/85,
shaping the ac-input line current waveform to
temperature cycle, autoclave or unbiased HAST,
correspond to the ac-input line voltage. To do this the
electromigration, bond intermetallic life, and mold compound
life. Such qualification testing should not be viewed as
UC2854B uses average current mode control.
justifying use of this component beyond specified
Average current mode control maintains stable, low
performance and environmental limits.
distortion sinusoidal line current without the need for
• Controls Boost PWM to Near-Unity Power Factor
slope compensation, unlike peak current mode
control.
• Limits Line Current Distortion to <3%
• World-Wide Operation Without Switches
A 1% 7.5-V reference, fixed frequency oscillator,
PWM, voltage amplifier with soft-start, line voltage
• Accurate Power Limiting
feedforward (VRMS squarer), input supply voltage
• Fixed-Frequency Average Current-Mode Control
clamp, and over current comparator round out the list
• High Bandwidth (5 MHz), Low-Offset Current
of features.
Amplifier
The UC2854B is available in a DW (SOIC-wide)
• Integrated Current- and Voltage Amplifier Output
package.
Clamps
Device Information
(1)
• Multiplier Improvements: Linearity, 500 mV VAC
Offset (Eliminates External Resistor), 0 V to 5 V
PART NUMBER PACKAGE BODY SIZE (NOM)
Multout Common-Mode Range
UC2854B-EP SOIC (16) 10.30 mm × 7.50 mm
• V
REF
GOOD Comparator
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
• Faster and Improved Accuracy ENABLE
Block Diagram
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.
UC2854B-EP
SGLS318A –NOVEMBER 2005–REVISED NOVEMBER 2015
www.ti.com
Table of Contents
8.3 Feature Description................................................. 10
1 Features.................................................................. 1
8.4 Device Functional Modes........................................ 12
2 Applications ........................................................... 1
9 Application and Implementation ........................ 13
3 Description ............................................................. 1
9.1 Application Information............................................ 13
4 Revision History..................................................... 2
9.2 Typical Application ................................................. 13
5 Description (continued)......................................... 3
10 Power Supply Recommendations ..................... 29
6 Pin Configuration and Functions......................... 4
11 Layout................................................................... 29
7 Specifications......................................................... 5
11.1 Layout Guidelines ................................................. 29
7.1 Absolute Maximum Ratings ...................................... 5
11.2 Layout Example .................................................... 30
7.2 ESD Ratings.............................................................. 5
12 Device and Documentation Support ................. 31
7.3 Recommended Operating Conditions....................... 5
12.1 Community Resources.......................................... 31
7.4 Thermal Information.................................................. 5
12.2 Trademarks........................................................... 31
7.5 Electrical Characteristics........................................... 6
12.3 Electrostatic Discharge Caution............................ 31
7.6 Typical Characteristics.............................................. 8
12.4 Glossary................................................................ 31
8 Detailed Description............................................ 10
13 Mechanical, Packaging, and Orderable
8.1 Overview ................................................................. 10
Information ........................................................... 31
8.2 Functional Block Diagram ....................................... 10
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (November 2005) to Revision A Page
• Added Pin Functions table, ESD Ratings table, Thermal Information table, Detailed Description section, Application
and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section................................................................ 1
• Updated the max V
CC
turn-on threshold voltage .................................................................................................................... 6
• Updated the max enable threshold voltage............................................................................................................................ 6
2 Submit Documentation Feedback Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: UC2854B-EP
UC2854B-EP
www.ti.com
SGLS318A –NOVEMBER 2005–REVISED NOVEMBER 2015
5 Description (continued)
The UC2854A/B products improve upon the UC2854 by offering a wide bandwidth, low offset current amplifier, a
faster responding and improved accuracy enable comparator, a VREF GOOD comparator, UVLO threshold
options (16 V/10 V for offline, 10.5 V/10 V for startup from an auxiliary 12-V regulator), lower startup supply
current, and an enhanced multiply/divide circuit.
New features like the amplifier output clamps, improved amplifier current sinking capability, and low offset VAC
pin reduce the external component count while improving performance. Improved common mode input range of
the multiplier output/current amplifier input allow the designer greater flexibility in choosing a method for current
sensing. Unlike its predecessor, RSET controls only oscillator charging current and has no effect on clamping the
maximum multiplier output current. This current is now clamped to a maximum of 2 × IAC at all times which
simplifies the design process and provides foldback power limiting during brownout and extreme low line
conditions.
Copyright © 2005–2015, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: UC2854B-EP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
PKLMT
CAO
ISENSE
MOUT
IAC
VAO
VRMS
GTDRV
VCC
CT
SS
RSET
VSENSE
ENA
VREF
UC2854B-EP
SGLS318A –NOVEMBER 2005–REVISED NOVEMBER 2015
www.ti.com
6 Pin Configuration and Functions
DW Package
16-Pin SOIC
Top View
Pin Functions
PIN
I/O DESCRIPTION
NAME J/N/DW Q/L
Output of the wide bandwidth current amplifier and one of the inputs to the PWM duty-cycle
CAO 3 4 O comparator. The output signal generated by this amplifier commands the PWM to force the
correct input current. The output can swing from 0.1 V to 7.5 V.
CT 14 18 I Capacitor from CT to GND sets the PWM oscillator frequency
A nominal voltage above 2.65 V on this pin allows the device to begin operating. Once
ENA 10 13 I
operating, the device shuts off if this pin goes below 2.15 V nominal.
All bypass and timing capacitors connected to GND should have leads as short and direct
GND 1 2 —
as possible. All voltages are measured with respect GND.
Output of the PWM is a 1.5-A peak totem-pole MOSFET gate driver on GTDRV. This output
is internally clamped to 15 V so that the device can be operated with VCC as high as 35 V.
GTDRV 16 20 O Use a series gate resistor of at least 5 Ω to prevent interaction between the gate impedance
and the GTDRV output driver that might cause the GTDRV output to overshoot excessively.
Some overshoot of the GTDRV output is always expected when driving a capacitive load.
Current input to the multiplier, proportional to the instantaneous line voltage. This input to
the analog multiplier is a current. The multiplier is tailored for low distortion from this current
input (IAC) to MOUT, so this is the only multiplier input that should be used for sensing
IAC 6 8 I instantaneous line voltage. The nominal voltage on ac is 6 V, so in addition to a resistor from
IAC to rectified 60 Hz, connect a resistor from IAC to VREF. If the resistor to VREF is one-
fourth of the value of the resistor to the rectifier, then the 6-V offset is cancelled, and the line
current has minimal cross-over distortion.
Switch current sensing input. This is the inverting input to the current amplifier. This input
and the non-inverting input MOUT remain functional down to and below GND. Care should
ISENSE 4 5 I
be taken to avoid taking these inputs below −0.5 V, because they are protected with diodes
to GND.
Multiplier output and current sense plus. The output of the analog multiplier and the non-
inverting input of the current amplifier are connected together at MOUT. The cautions about
MOUT 5 7 I/O taking ISENSE below −0.5 V also apply to MOUT. As the multiplier output is a current, this
is a high-impedance input similar to ISENSE, so the current amplifier can be configured as a
differential amplifier to reject GND noise.
Peak limit. The threshold for PKLMT is 0 V. Connect this input to the negative voltage on the
PKLMT 2 3 I current sense resistor. Use a resistor to REF to offset the negative current sense signal up
to GND.
Oscillator charging current and multiplier limit set. A resistor from RSET to ground programs
RSET 12 15 I oscillator charging current. Multiplier output current does not exceed 3.75 V divided by the
resistor from RSET to ground.
Soft-start. SS remains at GND as long as the device is disabled or VCC is too low. SS pulls
up to over 8 V by an internal 14-mA current source when both VCC becomes valid and the
device is enabled. SS acts as the reference input to the voltage amplifier if SS is below
SS 13 17 I
VREF. With a large capacitor from SS to GND, the reference to the voltage regulating
amplifier rises slowly, and increase the PWM duty cycle slowly. In the event of a disable
command or a supply dropout, SS will quickly discharge to ground and disable the PWM.
VAO 7 9 I Voltage amplifier input
4 Submit Documentation Feedback Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: UC2854B-EP
UC2854B-EP
www.ti.com
SGLS318A –NOVEMBER 2005–REVISED NOVEMBER 2015
Pin Functions (continued)
PIN
I/O DESCRIPTION
NAME J/N/DW Q/L
VCC 15 19 I Positive supply rail
Used to set the peak limit point and as an internal reference for various device functions.
VREF 9 12 O
This voltage must be present for the device to operate.
One of the inputs into the multiplier. This pin provides the input RMS voltage to the multiplier
VRMS 8 10 I
circuitry.
This pin provides the feedback from the output. This input goes into the voltage error
VSENSE 11 14 I amplifier and the output of the error amplifier is another of the inputs into the multiplier
circuit.
7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
(1)
MIN MAX UNIT
V
CC
Supply voltage 22 V
VSENSE, VRMS, ISENSE MOUT 11 V
Input voltage
PKLMT 5 V
I
GTDRV
GTDRV current, continuous 0.5 A
I
GTDRV
GTDRV current, 50% duty cycle 1.5 A
Input current RSET, IAC, PKLMT, ENA 10 mA
T
J
Junction temperature −55 150 °C
T
sol
Lead temperature, 1.6 mm (1/16 inch) from case for 10 seconds 300 °C
T
stg
Storage temperature −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
7.2 ESD Ratings
VALUE UNIT
V
(ESD)
Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
(1)
±2000 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
V
CC
Supply voltage 10 20 V
T
J
Operating junction temperature −55 125 °C
7.4 Thermal Information
UC2854B-EP
DW (SOIC)
THERMAL METRIC
(1)
UNIT
16 PINS
HIGH LOW
R
θJA
Junction-to-ambient thermal resistance
(2)
36.9 38.4 °C/W
R
θJC
Junction-to-case thermal resistance 73.1 111.6 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
(2) R
θJA
values are based on zero air flow.
Copyright © 2005–2015, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: UC2854B-EP
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