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參數資料
| 型號： | TPA2015D1YZHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA16 |
| 封裝： | 1.954 X 1.954 MM, 0.50 MM PITCH, DSBGA-16 |
| 文件頁數： | 13/27頁 |
| 文件大小： | 1016K |
| 代理商： | TPA2015D1YZHT |
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(
)
x
c
I
1
f
=
2
R C
p
JA
1
θ
=
= 153 C/W
Derating Factor
0.0065
°
JA
J
JA Dmax
MAX = T MAX =
P
= 150 - 153(0.34) = 97.98 C
q
°
SLOS638 – MAY 2010
www.ti.com
COMPONENTS LOCATION AND SELECTION
Decoupling Capacitors
The TPA2015D1 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling.
Adequate power supply decoupling to ensures that the efficiency is high and total harmonic distortion (THD) is
low.
Place a low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1 mF, within 2 mm of the VBAT ball.
This choice of capacitor and placement helps with higher frequency transients, spikes, or digital hash on the line.
Additionally, placing this decoupling capacitor close to the TPA2015D1 is important, as any parasitic resistance
or inductance between the device and the capacitor causes efficiency loss. In addition to the 0.1 F ceramic
capacitor, place a 2.2 mF to 10 mF capacitor on the VBAT supply trace. This larger capacitor acts as a charge
reservoir, providing energy faster than the board supply, thus helping to prevent any droop in the supply voltage.
Input Capacitors
Input audio DC decoupling capacitors are recommended. The input audio DC decoupling capacitors prevents the
AGC from changing the gain due to audio DAC output offset. The input capacitors and TPA2015D1 input
Any mismatch in capacitance between the two inputs will cause a mismatch in the corner frequencies. Severe
mismatch may also cause turn-on pop noise. Choose capacitors with a tolerance of ±10% or better.
(4)
EFFICIENCY AND THERMAL INFORMATION
It is important to operate the TPA2015D1 at temperatures lower than its maximum operating temperature. The
maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor for
the package is shown in the dissipation rating table. Converting this to qJA for the WCSP package:
(5)
Given qJA of 153°C/W, the maximum allowable junction temperature of 150°C, and the internal dissipation of
0.34 W for 1.7 W, 8
Ω load, 3.6 V supply, the maximum ambient temperature is calculated as:
(6)
Equation 6 shows that the calculated maximum ambient temperature is 98°C at maximum power dissipation with
at 3.6 V supply and 8
Ω a load. The TPA2015D3 is designed with thermal protection that turns the device off
when the junction temperature surpasses 150°C to prevent damage to the IC.
20
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPA2015D1
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