Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

UC2853ADTR Fiches technique(PDF) 5 Page - Texas Instruments

Click here to check the latest version.
No de pièce UC2853ADTR
Description  High Power Factor Preregulator
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2853ADTR Fiches technique(HTML) 5 Page - Texas Instruments

  UC2853ADTR Datasheet HTML 1Page - Texas Instruments UC2853ADTR Datasheet HTML 2Page - Texas Instruments UC2853ADTR Datasheet HTML 3Page - Texas Instruments UC2853ADTR Datasheet HTML 4Page - Texas Instruments UC2853ADTR Datasheet HTML 5Page - Texas Instruments UC2853ADTR Datasheet HTML 6Page - Texas Instruments UC2853ADTR Datasheet HTML 7Page - Texas Instruments UC2853ADTR Datasheet HTML 8Page - Texas Instruments UC2853ADTR Datasheet HTML 9Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 10 page
background image
5
UC2853A
FB: Voltage
Amplifier
Inverting
Input,
Overvoltage
Comparator Input, Sync Input. This pin serves three
functions. FB accepts a fraction of the power factor
corrected output voltage through a voltage divider, and is
nominally regulated to 3V. FB voltages 5% greater than
nominal will trip the overvoltage comparator, and shut
down the output stage until the output voltage drops 5%.
The internal oscillator can be synchronized through FB by
injecting a 2V clock signal though a capacitor. To prevent
false tripping of the overvoltage comparator, the clock
signal must have a fast falling edge, but a slow rising
edge. See Application Note U-159 for more information.
GND: Ground. All voltages are measured with respect to
GND. The VCC bypass capacitor should be connected to
ground as close to the GND pin as possible.
IAC: AC Waveform Input. This input provides voltage
waveform information to the multiplier. The current loop
will try to produce a current waveform with the same
shape as the IAC signal. IAC is a low impedance input,
nominally at 2V, which accepts a current proportional to
the input voltage. Connect a resistor from the rectified in-
put line to IAC which will conduct 500
mA at maximum line
voltage.
IMO: Multiplier Output and Current Sense Inverting Input.
The output of the multiplier and the inverting input of the
current amplifier are connected together at IMO. Avoid
bringing this input below –0.5V to prevent the internal
protection diode from conducting. The multiplier output is
a current, making this a summing node and allowing a dif-
ferential current error amplifier configuration to reject
ground noise. The input resistance at this node should be
3.9k to minimize input bias current induced offset voltage.
See the Applications section for the recommended circuit
configuration.
OUT: Gate Driver Output. OUT provides high current gate
drive for the external power MOSFET. A 15V clamp pre-
vents excessive MOSFET gate-to-source voltage so that
the UC2853A can be operated with VCC and high as
40V. A series gate resistor of at least 5 ohms should be
used to minimize clamp voltage overshoot. In addition, a
Schottky diode such as a 1N5818 connected between
OUT and GND may be necessary to prevent parasitic
substrate diode conduction.
ICOMP: Current Loop Error Amplifier Output. The cur-
rent loop error amplifier is a conventional operational
amplifier with a 150
mA current source class A output
stage. Compensate the current loop by placing an im-
pedance between ICOMP and IMO. This output can
swing above the oscillator peak voltage, allowing zero
duty cycle when necessary.
VCC: Input Supply Voltage. This pin serves two func-
tions. It supplies power to the chip, and an input voltage
level signal to the squarer circuit. When this input is con-
nected to a DC voltage proportional to the AC input RMS
voltage, the voltage loop gain is reduced by
64
2
VCC
.
This configuration maintains constant loop gain. The
UC2853A input voltage range extends from 12V to 40V,
allowing an AC supply voltage range in excess of 85VAC
to 265VAC. Bypass VCC with at least a 0.1
mF ceramic
capacitor to ensure proper operation. See the Applica-
tions section for the recommended circuit configuration.
VCOMP: Voltage Loop Error Amplifier Output. The
voltage loop error amplifier is a transconductance type
operational amplifier. A feedback impedance between
VCOMP and FB for loop compensation must be avoided
to
maintain
proper
operation
of
the
overvoltage
protection comparator. Instead, compensate the voltage
loop with an impedance between VCOMP and GND.
When VCOMP is below 1.5V, the multiplier output
current is zero.
PIN DESCRIPTIONS


Numéro de pièce similaire - UC2853ADTR

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
UC2853ADTR TI1-UC2853ADTR Datasheet
854Kb / 9P
[Old version datasheet]   High Power Factor Preregulator
More results

Description similaire - UC2853ADTR

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
UC1854 TI-UC1854 Datasheet
281Kb / 9P
[Old version datasheet]   High Power Factor Preregulator
UC2853A TI1-UC2853A_16 Datasheet
854Kb / 9P
[Old version datasheet]   High Power Factor Preregulator
UC1854 TI-UC1854_08 Datasheet
473Kb / 13P
[Old version datasheet]   High Power Factor Preregulator
logo
TOKO, Inc
TK83854 TOKO-TK83854 Datasheet
109Kb / 12P
   HIGH POWER FACTOR PREREGULATOR
logo
Texas Instruments
UC1853 TI1-UC1853_08 Datasheet
401Kb / 10P
[Old version datasheet]   High Power Factor Preregulator
UC1852 TI-UC1852 Datasheet
210Kb / 6P
[Old version datasheet]   High Power-Factor Preregulator
UC1852 TI-UC1852_V01 Datasheet
802Kb / 10P
[Old version datasheet]   High Power-Factor Preregulator
UC3854N-F TI1-UC3854N-F Datasheet
312Kb / 12P
[Old version datasheet]   High Power Factor Preregulator
UC1852 TI1-UC1852_08 Datasheet
405Kb / 10P
[Old version datasheet]   High Power-Factor Preregulator
UC1853 TI-UC1853 Datasheet
204Kb / 6P
[Old version datasheet]   High Power Factor Preregulator
More results


Html Pages

1 2 3 4 5 6 7 8 9 10


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com