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TPA3112D1EVM Arkusz danych(PDF) 10 Page - Texas Instruments

Numer części TPA3112D1EVM
Szczegółowy opis  25-W FILTER-FREE MONO CLASS-D AUDIO POWER AMPLIFIER with SPEAKER GUARD?
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
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PO(Tot) − Total Output Power − W
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
5
10
15
20
25
30
G015
Gain = 20 dB
VCC = 12 V
ZL = 4 Ω + 33 µH
−120
−100
−80
−60
−40
−20
0
f − Frequency − Hz
20
100
1k
10k
20k
G016
Gain = 20 dB
VCC = 12 V
ZL = 8 Ω + 66 µH
TPA3112D1
SLOS654C – SEPTEMBER 2009 – REVISED JULY 2012
www.ti.com
TYPICAL CHARACTERISTICS (continued)
(All Measurements taken at 1 kHz, unless otherwise noted. Measurements were made using the TPA3112D2 EVM which is
available at ti.com.)
SUPPLY CURRENT
SUPPLY RIPPLE REJECTION RATIO
vs
vs
TOTAL OUTPUT POWER
FREQUENCY
Figure 14.
Figure 15.
DEVICE INFORMATION
Gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA3112D1 is set by two input terminals, GAIN0 and GAIN1. The voltage slew rate of these gain
terminals, along with terminals 1 and 14, must be restricted to no more than 10V/ms. For higher slew rates, use
a 100k
Ω resistor in series with the terminals.
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance (ZI) to be dependent on the gain setting. The actual gain settings are controlled by
ratios of resistors, so the gain variation from part-to-part is small. However, the input impedance from part-to-part
at the same gain may shift by ±20% due to shifts in the actual resistance of the input resistors.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 7.2 k
Ω, which is the absolute minimum input impedance of the TPA3112D1. At the lower gain
settings, the input impedance could increase as high as 72 k
Table 1. Gain Setting
INPUT IMPEDANCE
AMPLIFIER GAIN (dB)
(k
Ω)
GAIN1
GAIN0
TYP
TYP
0
0
20
60
0
1
26
30
1
0
32
15
1
1
36
9
10
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Product Folder Link(s): TPA3112D1


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