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UC3172A датащи(PDF) 8 Page - Texas Instruments

номер детали UC3172A
подробное описание детали  Full Bridge Power Amplifier
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3172A датащи(HTML) 8 Page - Texas Instruments

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UC3172A
Figure 1. Typical Application
APPLICATION INFORMATION (cont.)
Design Procedure for Application of the UC3172A
The following is a simple design flow that can be used to
configure the UC3172A or UC3173A Full Bridge Power
Amplifiers as shown in Figure 1.
Definitions:
f3dB
= the closed loop 3dB bandwidth
AVB
= B amplifier closed loop gain, = Rfd/Rfc
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 range
mode
GmLR = closed loop transconductance in low range
mode
L
= load inductance
RL
= load resistance
A. Choose RS to be as large as head room will tolerate,
this is the series current sense resistor.
B. Choose a value of RFB to be less than the peak cur-
rent sense amplifier swing divided by 1mA. A value in
the range of 3k to 10k is suggested.
C. Calculate RFA according to:
(1) RFA
=
RFB
0.5
• RS • GmHR
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:
(2) RFA
=
RFB
2
• RS • GmLR
D. 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
amplifier is slaved to the A amplifier. The bias point of
the REFIN and the gain of the B amplifier, as well as
the saturation voltages of the power output stages,
will affect the voltage available to the load.
There are two simple procedures to follow, either will
insure that the capabilities of the device are fully util-
ized. The first is to set the REFIN voltage at the cen-
ter of the available voltage swing at the output of the
power amplifiers. This optimum reference is defined
by equation (3).
(3) VREF
(optimum) =
VIN
− VHSsat + VLSsat
2
where: VHSsat = high-side Vsat at maximum load
VLSsat = low-side Vsat at maximum load.
A second approach is to raise the gain of the B am-
plifier 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:
(4) AVB
=
VIN
− VHSsat
+ VREF
VREF
− VLSsat
or,
VREF
− VLSsat
VIN
− VHSsat − VREF
UDG-94040
GM
=
IL
VS
=
Rfb
Rfa
I
AVCS
• RS
AVCS= Current Sense
Amplifier Gain
= 2.0 Low Range,
0.5 High Range
8


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