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參數(shù)資料
| 型號(hào)： | TPA2010D1YZF |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 2.5-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 2.5單聲道無濾波器D類音頻功率放大器 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 415K |
| 代理商： | TPA2010D1YZF |
SLOS417A OCTOBER 2003 REVISED DECEMBER 2003
www.ti.com
17
EFFICIENCY AND THERMAL INFORMATION
The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor
for the YEF and YEZ packages are shown in the dissipation rating table. Converting this to
θ
JA
:
JA
1
Derating Factor
1
0.0078
128.2
°
C W
Given
θ
JA
of 128.2
°
C/W, the maximum allowable junction temperature of 125
°
C, and the maximum internal
dissipation of 0.4 W (2.25 W, 4-
load, 5-V supply, from Figure 3), the maximum ambient temperature can be
calculated with the following equation.
TAMax
TJMax
JAPDmax
125
128.2 (0.4)
73.7
°
C
Equation (16) shows that the calculated maximum ambient temperature is 73.7
°
C at maximum power
dissipation with a 5-V supply and 4-
a load, see Figure 3. The TPA2010D1 is designed with thermal protection
that turns the device off when the junction temperature surpasses 150
°
C to prevent damage to the IC. Also,
using speakers more resistive than 4-
dramatically increases the thermal performance by reducing the output
current and increasing the efficiency of the amplifier.
ELIMINATING THE OUTPUT FILTER WITH THE TPA2010D1
This section focuses on why the user can eliminate the output filter with the TPA2010D1.
Effect on Audio
The class-D amplifier outputs a pulse-width modulated (PWM) square wave, which is the sum of the switching
waveform and the amplified input audio signal. The human ear acts as a band-pass filter such that only the
frequencies between approximately 20 Hz and 20 kHz are passed. The switching frequency components are
much greater than 20 kHz, so the only signal heard is the amplified input audio signal.
Traditional Class-D Modulation Scheme
The traditional class-D modulation scheme, which is used in the TPA005Dxx family, has a differential output
where each output is 180 degrees out of phase and changes from ground to the supply voltage, V
DD
. Therefore,
the differential pre-filtered output varies between positive and negative V
DD
, where filtered 50% duty cycle
yields 0 volts across the load. The traditional class-D modulation scheme with voltage and current waveforms
is shown in Figure 35. Note that even at an average of 0 volts across the load (50% duty cycle), the current
to the load is high causing a high loss and thus causing a high supply current.
0 V
5 V
+5 V
Current
OUT+
Differential Voltage
Across Load
OUT
Figure 35. Traditional Class-D Modulation Scheme’s Output Voltage and
Current Waveforms Into an Inductive Load With no Input
(15)
(16)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA2010D1YZFR | 功能描述:音頻放大器 Mono Filter-Free Class-D in WCSP RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2010D1YZFRG4 | 制造商:TI 功能描述:AUDIO POWER AMPLIFIER |
| TPA2010D1YZFT | 功能描述:音頻放大器 Mono Filter-Free Class-D in WCSP RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2011D1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.2W Mono Filter-Free Class-D Audio Power Amplifier With Auto-Recovering Short-Circuit Protection |
| TPA2011D1_12 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.2W Mono Filter-Free Class-D Audio Power Amplifier |
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