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UC2854B-EP Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce UC2854B-EP
Description  Advanced High-Power Factor Preregulator
Download  38 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2854B-EP Fiches technique(HTML) 3 Page - Texas Instruments

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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
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