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

X  

UC2855BDW Fiches technique(PDF) 4 Page - Texas Instruments

Click here to check the latest version.
No de pièce UC2855BDW
Description  High Performance Power Factor Preregulator
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2855BDW Fiches technique(HTML) 4 Page - Texas Instruments

  UC2855BDW Datasheet HTML 1Page - Texas Instruments UC2855BDW Datasheet HTML 2Page - Texas Instruments UC2855BDW Datasheet HTML 3Page - Texas Instruments UC2855BDW Datasheet HTML 4Page - Texas Instruments UC2855BDW Datasheet HTML 5Page - Texas Instruments UC2855BDW Datasheet HTML 6Page - Texas Instruments UC2855BDW Datasheet HTML 7Page - Texas Instruments UC2855BDW Datasheet HTML 8Page - Texas Instruments UC2855BDW Datasheet HTML 9Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 12 page
background image
4
UC2855A/B
UC3855A/B
ELECTRICAL CHARACTERISTICS:Unless otherwise specified: VCC = 18V, RT = 15k, RVS = 23k, CT = 470pF, CI =
150pF, VRMS = 1.5V, IAC = 100
µA, ISENSE = 0V, CAOUT = 4V, VAOUT= 3.5V, VSENSE = 3V. –40°C to 85°C (UC2855A/B), 0°C
to 70
°C (UC3855A/B).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
ZVT
Reset Threshold
2.3
2.6
2.9
V
Input Bias Current
V = 2.5V, VCT =0
6
20
µA
Propagation Delay
Measured at ZVTOUT
100
ns
Maximum Pulse Width
400
ns
Output High Voltage
lOUT = −100mA, VCC = 15V
12
12.8
V
Output Low Voltage
lOUT = 100mA
1
2.2
V
lOUT = 10mA
300
900
mV
Output Low (UVLO)
lOUT = 50mA, VCC = 0V
0.9
1.5
V
Output RISE/FALL Time
CLOAD = 1nF
35
ns
Output Peak Current
CLOAD = 10nF
0.75
A
Current Synthesizer
ION to CS Offset
VION = 0V
30
50
mV
Cl Discharge Current
IAC = 50
µA
105
118
140
µA
IAC = 500
µA5
µA
IAC Offset Voltage
0.3
0.65
1.1
V
ION Buffer Slew Rate
10
V/
µs
ION Input Bias Current
VION =2V
2
15
µA
RVS Output Voltage
23k from RVS to GND
2.87
3
3.13
V
Note 1: Gain constant (K) =
IAC VA
V
VIMO
OUT
RMS
(– . )
()
15
2
at VRMS = 1.5V, VAOUT = 5.5V.
PIN DESCRIPTIONS
CA
This is the inverting input to the current amplifier.
Connect the required compensation components be-
tween this pin and CAOUT. The common mode operating
range for this input is between
−0.3V and 5V.
CAO: This is the output of the wide bandwidth current
amplifier and one of the inputs to the PWM duty cycle
comparator. The output signal generated by this amplifier
commands the PWM to force the correct input current.
The output can swing from 0.1V to 7.5V.
CI: The level shifted current sense signal is impressed
upon a capacitor connected between this pin and GND.
The buffered current sense transformer signal charges
the capacitor when the boost switch is on. When the
switch is off, the current synthesizer discharges the ca-
pacitor at a rate proportional to the dI/dt of the boost in-
ductor current. In this way, the discharge current is
approximately equal to
3
4
V
RRVS
IAC
.
Discharging the CI capacitor in this fashion, a “recon-
structed” version of the inductor current is generated us-
ing only one current sense transformer.
CS: The reconstructed inductor current waveform gener-
ated on the CI pin is level shifted down a diode drop to
this pin. Connect the current amplifier input resistor be-
tween CS and the inverting input of the current amplifier.
The waveform on this pin is compared to the multiplier
output waveform through the average current sensing
current amplifier. The input to the peak current limiting
comparator is also connected to this pin. A voltage level
greater than 1.5 volts on this pin will trip the comparator
and disable the gate driver output.
CT: A capacitor from CT to GND sets the PWM oscillator
frequency according to the following equation:
f
CT
1
11200
.
Use a high quality ceramic capacitor with low ESL and
ESR for best results. A minimum CT value of 200pF in-
sures good accuracy and less susceptibility to circuit lay-
out parasitics. The oscillator and PWM are designed to
provide practical operation to 500kHz.
GND: All voltages are measured with respect to this pin.
All bypass and timing capacitors connected to GND
should have leads as short and direct as possible.


Numéro de pièce similaire - UC2855BDW

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
UC2855BDW TI1-UC2855BDW Datasheet
1Mb / 17P
[Old version datasheet]   High Performance Power Factor Preregulator
UC2855BDWG4 TI1-UC2855BDWG4 Datasheet
1Mb / 17P
[Old version datasheet]   High Performance Power Factor Preregulator
UC2855BDWTR TI1-UC2855BDWTR Datasheet
1Mb / 17P
[Old version datasheet]   High Performance Power Factor Preregulator
UC2855BDWTR/81363G4 TI1-UC2855BDWTR/81363G4 Datasheet
1Mb / 17P
[Old version datasheet]   High Performance Power Factor Preregulator
UC2855BDWTRG4 TI1-UC2855BDWTRG4 Datasheet
1Mb / 17P
[Old version datasheet]   High Performance Power Factor Preregulator
More results

Description similaire - UC2855BDW

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
UC3855ADWG4 TI1-UC3855ADWG4 Datasheet
1Mb / 17P
[Old version datasheet]   High Performance Power Factor Preregulator
UC2853A TI-UC2853A Datasheet
411Kb / 10P
[Old version datasheet]   High Power Factor Preregulator
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
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


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