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TPA0213 データシート(PDF) 9 Page - Texas Instruments

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部品番号 TPA0213
部品情報  2-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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TPA0213 データシート(HTML) 9 Page - Texas Instruments

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TPA0213
2-W MONO AUDIO POWER AMPLIFIER
WITH HEADPHONE DRIVE
SLOS276D – JANUARY 2000 – REVISED NOVEMBER 2002
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
–60
–100
–120
0
–20
20
100
1k
10k 20k
f – Frequency – Hz
POWER SUPPLY REJECTION RATIO
vs
FREQUENCY
CB = 0.47 µF
–40
–80
VDD = 5 V
Stereo/SE
Gain = 1.9 dB
CB = 1 µF
Bypass = 2.5 V
Figure 13
APPLICATION INFORMATION
gain setting via input resistance
The gain of the input stage is set by the user-selected input resistor and a 50-k
Ω internal feedback resistor.
However, the power stage is internally configured with a gain of –1.25 V/V in SE mode, and –2.5 V/V in BTL
mode. Thus, the feedback resistor (RF) is effectively 62.5 kΩ in SE mode and 125 kΩ in BTL mode. Therefore,
the overall gain can be calculated using equations (1) and (2).
(1)
A
V +
–125 k
W
R
I
(BTL)
(2)
A
V +
–62.5 k
W
R
I
(SE)
The –3 dB frequency can be calculated using equation 3:
(3)
ƒ
–3dB +
1
2
p R
I
C
i
If the filter must be more accurate, the value of the capacitor should be increased while the value of the resistor
to ground should be decreased. In addition, the order of the filter could be increased.


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