поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

UC1854A датащи(PDF) 4 Page - Texas Instruments

номер детали UC1854A
подробное описание детали  Enhanced High Power Factor Preregulator
Download  7 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

UC1854A датащи(HTML) 4 Page - Texas Instruments

  UC1854A Datasheet HTML 1Page - Texas Instruments UC1854A Datasheet HTML 2Page - Texas Instruments UC1854A Datasheet HTML 3Page - Texas Instruments UC1854A Datasheet HTML 4Page - Texas Instruments UC1854A Datasheet HTML 5Page - Texas Instruments UC1854A Datasheet HTML 6Page - Texas Instruments UC1854A Datasheet HTML 7Page - Texas Instruments  
Zoom Inzoom in Zoom Outzoom out
 4 / 7 page
background image
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
GATE DRIVER
Output High Voltage
IOUT = –200mA, VCC = 15V
12
12.8
V
Output Low Voltage
IOUT = 200mA
1
2.2
V
IOUT = 10mA
300
500
mV
Output Low (UVLO)
IOUT = 50mA, VCC = 0V
0.9
1.5
V
Output Rise / Fall Time
CLOAD = 1nF, (Note 1)
35
ns
Output Peak Current
CLOAD = 10nF, (Note 1)
1.0
A
UC1854A/B
UC2854A/B
UC3854A/B
Note 1: Guaranteed by design, not 100% tested in production.
Note 2: Gain constant (K) =
IAC
× (Va − 1.5V)
VRMS
2
× IMO
ELECTRICAL
CHARACTERISTICS (cont.)
Unless otherwise stated, VCC=18V, RT=8.2k, CT=1.5nF, PKLMT=1V, VRMS=1.5V, IAC=100
µA,
ISENSE=0V, CA Out=3.5V, VA Out=5V, VSENSE=3V, –55
oC<TA<125oC for the UC1854A/B,
–40
oC<TA<85oC for the UC2854A/B, and 0oC<TA<70oC for the UC3854A/B, and TA=TJ.
The
UC1854A/B
products
were
designed
as
pin
compatible upgrades to the industry standard UC1854
active Power Factor correction circuits. The circuit
enhancements allow the user to eliminate in most cases
several
external
components
currently
required
to
successfully apply the UC1854. In addition, linearity
improvements to the Multiply, Square, and Divide circuitry
optimizes
overall
system
performance.
Detailed
descriptions of the circuit enhancements are provided
below. For in-depth design applications reference data
refer to Unitrode application notes U-134 and DN-44.
MULTIPLY / SQUARE AND DIVIDE
The UC1854A/B Multiplier design maintains the same
gain constant (K =
−1), as the UC1854. The relationship
between the inputs and output current is given as:
IMO = IAC(VAO - 1.5V) / K
•VRMS2
This is nearly the same as the UC1854, but circuit
differences
have
improved
the
performance
and
application.
The first difference is with the IAC input. The UC1854A/B
regulates this pin voltage to a nominal 500mV over the full
operating temperature range, rather than the 6.0V used
on the UC1854. This low offset voltage eliminates the
need for a line zero crossing compensating resistor to
VREF from IAC that UC1854 designs require. The
maximum current at high line into IAC should be limited to
250
µA for best performance. Therefore, if VAC (max) =
270V, then RAC = 270(1.414) / 250
µA = 1.53MΩ.
The VRMS pin linear operating range is improved with the
UC1854A/B as well. The input range for VRMS extends
from 0 to 5.5V. Since the UC1854A squaring circuit
employs an analog multiplier, rather than a linear
approximation, accuracy is improved, and discontinuities
are eliminated. The external divider network connected to
VRMS should produce 1.5V at low line (85VAC). This will
put 4.77V on VRMS at high line (27VAC) which is well
within its operating range.
The Voltage Amplifier output forms the third input to the
Multiplier
and
is
internally
clamped
to 6.0V.
This
eliminates an external zenerclamp often used in UC1854
designs. The offset voltage at this input to the Multiplier
has been raised on the UC1854A/B to 1.5V.
The Multiplier output pin, which is also common to the
Current Amplifier non-inverting input, has a
−0.3V to 5.0V
output range,compared to the
−0.3 to 2.5V range of the
UC1854. This improvement allows the UC1854A/B to be
used in applications where the current sense signal
amplitude is very large.
VOLTAGE AMPLIFIER
The UC1854A/B Voltage Amplifier design is essentially
similar to the UC1854 with two exceptions. The first is with
the internal connection. The lower voltage reduces the
amount of charge on the compensation capacitor, which
provides improved recovery from large signal events,
such as line dropouts, or power interruption. It also
minimizes the DC current flowing through the feedback.
The output of the Voltage amplifier is also changed. In
addition to a 6.0V temperature compensated clamp, the
output short circuit current has been lowered to 2mA
typical, and an active pull down has replaced the passive
pulldown of the UC1854.
CURRENT AMPLIFIER
The Current Amplifier for an average current PFC
controller needs a low offset voltage in order to minimize
AC line current distortion. With this in mind, the
UC1854A/B Current Amplifier has improved the input
offset voltage from ±4mV to 0 to
−3mV. The negative
FUNCTIONAL DESCRIPTION
4


Аналогичный номер детали - UC1854A

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
UC1854A TI1-UC1854A Datasheet
741Kb / 18P
[Old version datasheet]   ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC1854A TI1-UC1854A Datasheet
743Kb / 18P
[Old version datasheet]   ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC1854A TI1-UC1854A_13 Datasheet
741Kb / 18P
[Old version datasheet]   ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC1854A TI1-UC1854A_15 Datasheet
743Kb / 18P
[Old version datasheet]   ADVANCED HIGH-POWER FACTOR PREREGULATOR
More results

Аналогичное описание - UC1854A

производительномер деталидатащиподробное описание детали
logo
Unisonic Technologies
UC3854 UTC-UC3854 Datasheet
138Kb / 6P
   ENHANCED HIGH POWER FACTOR PREREGULATOR
UC3854 UTC-UC3854_V01 Datasheet
309Kb / 6P
   ENHANCED HIGH POWER FACTOR PREREGULATOR
logo
Texas Instruments
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
More results


Html Pages

1 2 3 4 5 6 7


датащи скачать

Go To PDF Page


ссылки URL




Конфиденциальность
ALLDATASHEETRU.COM
Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   обмен ссыками   |   поиск по производителю
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