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UC2849DW Fiches technique(PDF) 1 Page - Texas Instruments

No de pièce UC2849DW
Description  SECONDARY SIDE AVERAGE CURRENT MODE CONTROLLER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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UC2849DW Fiches technique(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION
BLOCK DIAGRAM
Pinnumbersreferto24-pinpackages.
UC2849
UC3849
SLUS360C – JULY 1995 – REVISED AUGUST 2007
SECONDARY SIDE AVERAGE CURRENT MODE CONTROLLER
• Practical Secondary Side Control of Isolated
The
UC3849
family
of
average
current-mode
Power Supplies
controllers accurately accomplishes secondary side
average current mode control. The secondary-side
• 1 MHz Operation
output voltage is regulated by sensing the output
• Differential AC Switching Current Sensing
voltage and differentially sensing the ac switching
• Accurate Programmable Maximum Duty Cycle
current. The sensed output voltage drives a voltage
error amplifier. The ac switching current, monitored
• Multiple Chips Can be Synchronized to
by a current sense resistor, drives a high bandwidth,
Fastest Oscillator
low offset current sense amplifier. The outputs of the
• Wide Gain Bandwidth Product (70 MHz, Acl
voltage error amplifier and current sense amplifier
>10) Current Error and Current Sense
differentially drive a high bandwidth, integrating
Amplifiers
current error amplifier. The sawtooth waveform at the
• Up to Ten Devices Can Easily Share a
current error amplifier output is the amplified and
inverted inductor current sensed through the resistor.
Common Load
This inductor current down-slope compared to the
PWM ramp achieves slope compensation, which
gives
an
accurate
and
inherent
fast
transient
response to changes in load.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 1995–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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