參數(shù)資料
型號(hào)： TPA2014D1YZHT
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA16
封裝： 2.275 X 2.275 MM, GREEN, DSBGA-16
文件頁(yè)數(shù)： 8/27頁(yè)
文件大?。?/td> 945K
代理商： TPA2014D1YZHT
RECOMMENDED INDUCTOR AND CAPACITOR VALUES BY APPLICATION
CLASS-D REQUIREMENTS
DECOUPLING CAPACITORS
INPUT CAPACITORS
)
I I
1
f =
c
(2
R C
p
(6)
I
)
I
1
C =
(2
f
R
c
p
(7)
SLAS559A – MAY 2008 – REVISED JUNE 2008 ............................................................................................................................................................... www.ti.com
Use Table 4 as a guide for determining the proper inductor and capacitor values.
Table 4. Recommended Values
Class-D
Minimum
Required
Max
Output
Max IL
L
Inductor Vendor
C(2)
Capacitor Vendor
Load
VDD
VCC
ΔV
Power
(A)
(
H)
Part Numbers
(
F)
Part Numbers
(
)
(V)
(mVPP)
(W)(1)
3.3
10
Toko DE2812C
Kemet C1206C106K8PACTU
1
8
3
4.3
0.70
30
Coilcraft DO3314
Murata GRM32ER61A106KA01B
Murata LQH3NPN3R3NG0
Taiyo Yuden LMK316BJ106ML-T
4.7
22
Murata LQH43PN4R7NR0
1.2
8
3
5.0
0.9
30
Murata GRM32ER71A226KE20L
Toko DE4514C
Taiyo Yuden LMK316BJ226ML-T
Coilcraft LPS4018-472
(1)
All power levels are calculated at 1% THD unless otherwise noted
(2)
All values listed are for ceramic capacitors. The correction factor of 2 is included in the values.
The TPA2014D1 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling
to
ensure
the
efficiency
is
high
and
total
harmonic
distortion
(THD)
is
low.
Place
a
low
equivalent-series-resistance (ESR) ceramic capacitor, typically 1
F as close as possible to the device VDD lead.
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 TPA2014D1 is important for the efficiency of the
Class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can
cause a loss in efficiency. Place a capacitor of 10
F or greater between the power supply and the boost
inductor. The capacitor filters out high frequency noise. More importantly, it acts as a charge reservoir, providing
energy more quickly than the board supply, thus helping to prevent any droop.
The TPA2014D1 does not require input coupling capacitors if the design uses a differential source that is biased
within the common mode input range. Use input coupling capacitors if the input signal is not biased within the
recommended common-mode input range, if high pass filtering is needed, or if using a single-ended source.
The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in
The value of the input capacitor is important because it directly affects the bass (low frequency) performance of
the circuit. Speakers in wireless phones does not usually respond well to low frequencies, so the corner
frequency can be set to block low frequencies in this application. Not using input capacitors can increase output
offset.
Use Equation 7 to find the required the input coupling capacitance.
Any mismatch in capacitance between the two inputs will cause a mismatch in the corner frequencies. Choose
capacitors with a tolerance of ±10% or better.
16
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2014D1
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