поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

UC3173A датащи(PDF) 9 Page - Texas Instruments

номер детали UC3173A
подробное описание детали  Full Bridge Power Amplifier
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

UC3173A датащи(HTML) 9 Page - Texas Instruments

Back Button UC3173A_08 Datasheet HTML 4Page - Texas Instruments UC3173A_08 Datasheet HTML 5Page - Texas Instruments UC3173A_08 Datasheet HTML 6Page - Texas Instruments UC3173A_08 Datasheet HTML 7Page - Texas Instruments UC3173A_08 Datasheet HTML 8Page - Texas Instruments UC3173A_08 Datasheet HTML 9Page - Texas Instruments UC3173A_08 Datasheet HTML 10Page - Texas Instruments UC3173A_08 Datasheet HTML 11Page - Texas Instruments UC3173A_08 Datasheet HTML 12Page - Texas Instruments  
Zoom Inzoom in Zoom Outzoom out
 9 / 12 page
background image
9
UC3173A
()
()
V
(optimum) =
VIN - V
+ V
2
REFIN
HS SAT
LS SAT
(3)
Where:VHS(SAT) = high-side VSAT at maximum load
VLS(SAT) = low-side VSAT at maximum load.
A second approach is to raise the gain of the B amplifier
to insure maximum swing. For a given REFIN voltage the
gain of the B amplifier, set by the ratio of the feedback
resistors, can be made greater than unity as given by:
()
()
AB =
VIN – V
– V
V– V
V
HS SAT
REF
REFIN
LS SAT
or,
(4)
()
()
V– V
VIN – V
– V
REFIN
LS SAT
HS SAT
REF
whichever is greater than unity.
For a typical case, where VREFIN has been set at VIN/2,
the required gain fora5volt system will be about 1.5,
and for a 12 volt system, 1.2.
It is worth noting that when using this method the B am-
plifier will saturate before the A amplifier on one polarity
of the voltage swing. During the time when the B ampli-
fier is saturated and the A amplifier is not, the small sig-
nal bandwidth of the loop will be reduced by a factor of
(AVB + 1).
E. Loop Compensation
The normal configuration for compensation of the power
amplifier is shown in Fig. 1. A simple RC network, RCCC,
around the A amplifier is all that is required. The value of
the RCCC time constant is typically chosen to correspond
to the electrical time constant of the load, given by RL/L.
The bandwidth of the closed loop amplifier can be set by
choosing the value of RC. Calculate RC according to:
R=
2L f
R
(1 + A B)A CS R
C
3dB
FB
VV
S
π•
(5)
Use AVCS = 0.5 if range changing is to be used, and
AVCS = 2.0 if only the low range mode of operation is to
be used.
The compensation zero is typically set to coincide with
the L/R time constant of the Load. CC can then be calcu-
lated by:
C=
L
R(R
+ R )
C
CS
L
(6)
In the closed loop transconductance amplifier, the A am-
plifier operates at the highest noise gain. Noise gain is a
measure of the feedback ratio at which the amplifier is
operating. For the configuration of the A amplifier in Fig.
1, the noise gain is given by the impedance ratio of the
RC-CC series network, to the parallel combination of RFA
and RFB. For the A amplifier to operate at its expected
closed loop gain, the noise gain at any frequency must
not exceed its Gain Bandwidth Product (GBW) divided
by that frequency. Applying this to the expression above
will yield a result for the maximum 3dB bandwidth that
can be achieved for a given configuration.
()
f=
fA (1 + A B) A CS R
R
2L (R
+ R
)
3dB MAX
GBW
V
V
S
FA
FA
FB
••
π
1
2
(7)
Where: fGBWA is the GBW of the A amplifier.
In the UC3173A, to accommodate wider power amplifier
bandwidths, the GBW Product of the A amplifier has
been extended to 2MHz. Care should be taken that the
A amplifier gain bandwidth product is not limiting the
closed loop performance of the configured power ampli-
fier. This is easily checked by making sure that RC is
less than a critical value, RC(MAX), as given by:
R= R
fA 2 L R
(A B + 1) A CS R (R
+ R
)
C(MAX)
FB
GBW
FA
VV
S
FA
FB
••
••
π
1
2
(8)
Again, use AVCS = 0.5 if range changing is used, and
AVCS = 2.0 if only the low range mode of operation is
used.
F. Using The Comp Pin
When the range change feature of the UC3173A is
used, the closed loop bandwidth of the power amplifier
will change according to (7). In other words, the band-
width would be four times larger during the low range
mode when AVCS is equal to 2, than during the high
range mode when AVCS is equal to 0.5, unless the
value of RC is adjusted to compensate.
The COMP pin on the UC3173A can be used to do this.
The COMP pin acts as a simple switch that allows a par-
allel compensation network to be applied around the A
amplifier during low range operation. A simple network
as shown here will keep the loop response constant in-
dependent of the range condition.
To maintain the same 3dB bandwidth in both the high
and low range modes set RCA and CCA to:
R=
R
3
,C
= 3C
CA
C
CA
C
(9)
APPLICATION INFORMATION (cont.)


Аналогичный номер детали - UC3173A_08

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
UC3173A TI-UC3173A Datasheet
489Kb / 12P
[Old version datasheet]   Full Bridge Power Amplifier
More results

Аналогичное описание - UC3173A_08

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
UC3176 TI-UC3176 Datasheet
389Kb / 5P
[Old version datasheet]   Full Bridge Power Amplifier
UC3178 TI-UC3178 Datasheet
305Kb / 6P
[Old version datasheet]   Full Bridge Power Amplifier
UC3172A TI1-UC3172A Datasheet
486Kb / 12P
[Old version datasheet]   Full Bridge Power Amplifier
UC3173A TI-UC3173A Datasheet
489Kb / 12P
[Old version datasheet]   Full Bridge Power Amplifier
UC3175B TI-UC3175B Datasheet
343Kb / 6P
[Old version datasheet]   Full-Bridge Power Amplifier
UC3178QP TI-UC3178QP Datasheet
274Kb / 8P
[Old version datasheet]   Full Bridge Power Amplifier
UC3176 TI1-UC3176_15 Datasheet
333Kb / 8P
[Old version datasheet]   Full Bridge Power Amplifier
logo
Advanced Analogic Techn...
AAT4901 ANALOGICTECH-AAT4901 Datasheet
1Mb / 16P
   Buffered Power Full-Bridge
logo
Monolithic Power System...
EV0041 MPS-EV0041 Datasheet
316Kb / 5P
   Full Bridge or Single Ended Audio Amplifier
logo
Microsemi Corporation
APTM20HM20FTG MICROSEMI-APTM20HM20FTG Datasheet
296Kb / 6P
   Full - Bridge MOSFET Power Module
More results


Html Pages

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


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