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UC2854B-EP Fiches technique(PDF) 1 Page - Texas Instruments

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No de pièce UC2854B-EP
Description  ADVANCED HIGH-POWER FACTOR PREREGULATOR
Download  13 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2854B-EP Fiches technique(HTML) 1 Page - Texas Instruments

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UC2854BEP
SGLS318 − NOVEMBER 2005
ADVANCED HIGHPOWER FACTOR
PREREGULATOR
1
www.ti.com
FEATURES
D Controlled Baseline
− One Assembly/Test Site, One
Fabrication Site
D Extended Temperature Performance of −55°C
to 125
°C
D Enhanced Diminishing Manufacturing
Sources (DMS) Support
D Enhanced Product-Change Notification
D Qualification Pedigree
D Controls Boost PWM to Near-Unity Power
Factor
D Limits Line Current Distortion To < 3%
D World-Wide Operation Without Switches
D Accurate Power Limiting
D Fixed-Frequency Average Current-Mode
Control
D High Bandwidth (5 MHz), Low-Offset Current
Amplifier
D Integrated Current- and Voltage Amplifier
Output Clamps
D Multiplier Improvements: Linearity, 500 mV
VAC Offset (Eliminates External Resistor), 0 V
to 5 V Multout Common-Mode Range
D VREF GOOD Comparator
D Faster and Improved Accuracy ENABLE
Comparator
D UVLO Options (16 V/10 V or 10.5 V/10 V)
D 300-µA Start-Up Supply Current
† Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range.
This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST,
electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this
component beyond specified performance and environmental limits.
DESCRIPTION
The UC2854B products are pin compatible enhanced versions of the UC2854. Like the UC2854, these products
provide all of 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 the ac-input line voltage.
To do this the UC2854B uses average current mode control. Average current mode control maintains stable,
low distortion sinusoidal line current without the need for slope compensation, unlike peak current mode control.
A 1% 7.5-V reference, fixed frequency oscillator, PWM, voltage amplifier with soft-start, line voltage feedforward
(VRMS squarer), input supply voltage clamp, and over current comparator round out the list of features.
The UC2854B is available in a DW (SOIC-Wide) package.
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.
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
 2005, Texas Instruments Incorporated


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