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參數(shù)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(shù)： | 10/27頁 |
| 文件大小： | 1016K |
| 代理商： | TPA2015D1YZHT |
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L
PVDD
I
= I
VBAT
0.8
÷
è
SLOS638 – MAY 2010
www.ti.com
The boost converter design is optimized for driving the integrated Class-D amplifier only. It lacks protection
circuitry recommended for driving loads other than the integrated Class-D amplifier.
Boost Converter Overvoltage Protection
The TPA2015D1 internal boost converter operates in a discontinuous mode to improve the efficiency at light
loads. The boost converter has overvoltage protection that disables the boost converter if the output voltage
exceeds 5.8 V. If current is forced into the PVOUT terminal, the voltage clamp will sink up to 10 mA. If more than
10 mA is forced into PVOUT, then the PVOUT voltage will increase. Refer to the SPEAKER LOAD LIMITATION
section for details.
Boost Converter Component Section
Boost Terms
The following is a list of terms and definitions used in the boost equations found later in this document.
C
Minimum boost capacitance required for a given ripple voltage on PVOUT.
L
Boost inductor.
fBOOST
Switching frequency of the boost converter.
IPVDD
Current pulled by the Class-D amplifier from the boost converter.
IL
Average current through the boost inductor.
PVDD
Supply voltage for the Class-D amplifier. (Voltage generated by the boost converter output.)
(PVOUT)
VBAT
Supply voltage to the IC.
ΔIL
Ripple current through the inductor.
ΔV
Ripple voltage on PVOUT.
Boost Converter Inductor Selection
Working inductance decreases as inductor current and temperature increases. If the drop in working inductance
is severe enough, it may cause the boost converter to become unstable, or cause the TPA2015D1 to reach its
current limit at a lower output voltage than expected. Inductor vendors specify currents at which inductor values
decrease by a specific percentage. This can vary by 10% to 35%. Inductance is also affected by dc current and
temperature.
Inductor Equations
Inductor current rating is determined by the requirements of the load. The inductance is determined by two
factors: the minimum value required for stability and the maximum ripple current permitted in the application.
Use Equation 1 to determine the required current rating. Equation 1 shows the approximate relationship between
the average inductor current, IL, to the load current, load voltage, and input voltage (IPVDD, PVDD, and VBAT,
respectively). Insert IPVDD, PVDD, and VBAT into Equation 1 and solve for IL. The inductor must maintain at least
90% of its initial inductance value at this current.
(1)
WARNING
Use a minimum working inductance of 1.3 mH. Lower values may damage the
inductor.
18
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPA2015D1
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