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UC3173A датащи(PDF) 8 Page - Texas Instruments

номер детали UC3173A
подробное описание детали  Full Bridge Power Amplifier
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производитель  TI1 [Texas Instruments]
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UC3173A датащи(HTML) 8 Page - Texas Instruments

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UC3173A
8
Figure 1. Typical application.
APPLICATION INFORMATION (cont.)
Design Procedure for Application of the UC3173A
The following is a simple design flow that can be used to
configure the UC3173A Full Bridge Power Amplifiers as
shown in Fig. 1.
A. Current Sense Resistor
Choose RS to be as large as head room will tolerate, this
is the series current sense resistor.
B. Select Feedback Resistance
Choose a value of RFB to be less than the peak current
sense amplifier swing divided by 1mA. A value in the
range of 3k to 10k is suggested.
C. Set Transconductance
Calculate RFA according to:
R=
R
0.5 R
G
FA
FB
SmHR
••
(1)
If the range change option is not going to be used, it is
recommended that the device be set in the low range
mode and RFA be calculated by:
R=
R
2R
G
FA
FB
SmLR
••
(2)
D. Optimize Voltage Swing
In order to assure that maximum voltage drive to the
load is achievable, there are some precautions that
should be taken. In a standard configuration, the B am-
plifier is slaved to the A amplifier. The bias point of the
and the gain of the B amplifier, as well as the saturation
voltages of the power output stages, will affect the volt-
age available to the load.
There are two simple procedures to follow, either will
insure that the capabilities of the device are fully utilized.
The first is to set the REFIN voltage at the center of the
available voltage swing at the output of the power
amplifiers. This optimum reference is defined by
equation (3)
GM =
IL
V
=
R
R
I
AV
R
S
FB
FA
CS
S
AVCS =Current Sense Amplifier Gain = 2.0 Low Range, 0.5 High Range
f3DB
= the closed loop 3dB bandwidth
AVB
= B amplifier closed loop gain, = R6/R5
AVCS
= current sense amplifier gain, = 0.5 in high range,
and 2.0 in low range
fGBWA
= gain bandwidth product of the A amplifier
GmHR
= closed loop transconductance in high rangemode
GmLR
= closed loop transconductance in low range mode
L
= load inductance
RL
= load resistance
Definitions:
UDG-94040


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