參數(shù)資料
型號(hào): TPA032D02DCAR
元件分類: 運(yùn)動(dòng)控制電子
英文描述: Dual Audio Amplifier
中文描述: 雙音頻放大器
文件頁(yè)數(shù): 22/31頁(yè)
文件大?。?/td> 445K
代理商: TPA032D02DCAR
TPA0312
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
SLOS335 –DECEMBER 2000
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 2. Common Load Impedances vs Low Frequency Output Characteristics in SE Mode
RL
CC
Lowest Frequency
3
4
8
32
330
μ
F
330
μ
F
330
μ
F
330
μ
F
330
μ
F
161 Hz
120 Hz
60 Hz
15 Hz
10,000
0.05 Hz
47,000
330
μ
F
0.01 Hz
As Table 2 indicates, most of the bass response is attenuated into a 4-
load, an 8-
load is adequate,
headphone response is good, and drive into line level inputs (a home stereo for example) is exceptional.
using low-ESR capacitors
Low-ESR capacitors are recommended throughout this applications section. A real (as opposed to ideal)
capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this
resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this
resistance the more the real capacitor behaves like an ideal capacitor.
bridged-tied load versus single-ended mode
Figure 39 shows a Class-AB audio power amplifier (APA) in a BTL configuration. The TPA0312 BTL amplifier
consists of two Class-AB amplifiers driving both ends of the load. There are several potential benefits to this
differential drive configuration, but initially consider power to the load. The differential drive to the speaker
means that as one side is slewing up, the other side is slewing down, and vice versa. This in effect doubles the
voltage swing on the load as compared to a ground referenced load. Plugging 2
×
V
O(PP)
into the power
equation, where voltage is squared, yields 4
×
the output power from the same supply rail and load impedance
(see equation 5).
Power
V(rms)
RL
2
(5)
V
(rms)
VO(PP)
2 2
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