參數(shù)資料
型號(hào)： MPZ2012S101A
廠商： Texas Instruments, Inc.
英文描述： 2.7-W CONSTANT OUTPUT POWER CLASS-D AUDIO AMPLIFIER WITH INTEGRATED BOOST CONVERTER
中文描述： 2.7鎢恒定輸出功率D類音頻放大器，具有集成升壓轉(zhuǎn)換器
文件頁(yè)數(shù)： 6/28頁(yè)
文件大?。?/td> 753K
代理商： MPZ2012S101A
www.ti.com
SETTING THE BOOST VOLTAGE
CC
0.5
(R1 + R2)
V
=
R1
÷
è
(1)
INDUCTOR SELECTION
CC
L
CC
DD
V
I = I
V
0.8
÷
è
(2)
DD
CC
DD
L
CC
V
(V
V
)
L =
I
f
V
boost
-
D
(3)
TPA2013D1
SLOS520 – AUGUST 2007
Use Equation 1 to determine the value of R1 for a given VCC. The maximum recommended value for VCC is
5.5 V. The typical value of the VCCFB pin is 500 mV. The current through the resistor divider should be about 100
times greater than the current into the VCCFB pin, typically 0.01 μA. Based on those two values, the
recommended value of R2 is 500 k
. VCC must be greater than 3 V and less than or equal to 5.5 V.
SURFACE MOUNT INDUCTORS
Working inductance decreases as inductor current increases. If the drop in working inductance is severe enough,
it may cause the boost converter to become unstable, or cause the TPA2013D1 to reach its current limit at a
lower output power 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.
TPA2013D1 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 2 to determine the required current rating. Equation 2 shows the approximate relationship between
the average inductor current, IL, to the load current, load voltage, and input voltage (ICC, VCC, and VDD,
respectively). Insert ICC, VCC, and VDD into Equation 2 to solve for IL. The inductor must maintain at least 90% of
its initial inductance value at this current.
The minimum working inductance is 2.2
μH. A lower value may cause instability.
Ripple current,
ΔIL, is peak-to-peak variation in inductor current. Smaller ripple current reduces core losses in the
inductor as well as the potential for EMI. Use Equation 3 to determine the value of the inductor, L. Equation 3
shows the relationship between inductance L, VDD, VCC, the switching frequency, fboost, and ΔIL. Insert the
maximum acceptable ripple current into Equation 3 to solve for L.
ΔIL is inversely proportional to L. Minimize ΔIL as much as is necessary for a specific application. Increase the
inductance to reduce the ripple current. Note that making the inductance too large will prevent the boost
converter from responding to fast load changes properly. Typical inductor values for the TPA2013D1 are 4.7
μH
to 6.8
μH.
Select an inductor with a small dc resistance, DCR. DCR reduces the output power due to the voltage drop
across the inductor.
14
Submit Documentation Feedback
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPA2013D1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MPZ2012S101AT 制造商:TDK Innoveta 功能描述:Ferrite Beads Multi-Layer Chip Bead 100Ohm 25% 100MHz 4A 0805 T/R
MPZ2012S101AT000 制造商:TDK 功能描述:
MPZ2012S101ATD25 制造商:TDK 功能描述:FERRITE CHIP BEADS - Tape and Reel
MPZ2012S102A 功能描述:電磁干擾濾波珠子、扼流圈和陣列 0805 1000ohms 100MHz Rdc 0.15ohms 1.5A RoHS:否 制造商:AVX 阻抗: 最大直流電流:35 mA 最大直流電阻: 容差: 端接類型:SMD/SMT 電壓額定值:25 V 工作溫度范圍:- 25 C to + 85 C 封裝 / 箱體:0603 (1608 metric)
MPZ2012S102AT 制造商:TDK 功能描述:Ferrite Beads Multi-Layer Chip Bead 1KOhm 25% 100MHz 1.5A 0805 制造商:TDK 功能描述:MPZ Series 1 kO 25 % 100 MHz 1.5 A 0805 Multi-Layer Chip Ferrite Bead 制造商:TDK 功能描述:MPZ Series 1 kO ?25 % 100 MHz 1.5 A 0805 Multi-Layer Chip Ferrite Bead
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