|
|
PDF PT5301EMSO Data sheet ( Hoja de datos )
| Número de pieza | PT5301EMSO | |
| Descripción | 2 Watts Audio Power Amplifier | |
| Fabricantes | Powtech | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de PT5301EMSO (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
PT5301
2 Watts Audio Power Amplifier
GENERAL DESCRIPTION
The PT5301 is an audio power amplifier mainly
designed for applications in mobile phones and other
portable communication device applications. It is
capable of delivering 1.25 watts of continuous average
power to an 8Ω load and 2 watts of continuous average
power to a 4Ω load with less than 1% distortion
(THD+N) from a 5V power supply. The PT5301 does
not require output coupling capacitors or bootstrap
capacitors, and therefore is ideally suited for mobile
phone and other low voltage applications where
minimal power consumption is a primary requirement.
The PT5301 features a low-power shutdown mode and
improved pop & click circuitry that attenuates noise
which would otherwise occur during turn on and turn
off transactions. The PT5301 is delivered with
miniature MSOP-8, DFN-8 and SMD-9 packages (Pd
free).
APPLICATION
z Mobil Phones
z PDAs
z Portable electronic devices
FEATURES
z Low Distortion
0.50W @ VDD=5.0V, RL=8Ω THD+N = 0.03%
0.25W @ VDD=3.0V, RL=8Ω THD+N = 0.04%
0.15W @ VDD=2.6V, RL=8Ω THD+N = 0.05%
z Output Power @ 1% THD+N
1.25W @ VDD=5.0V, RL=8Ω
2.0W @ VDD=5.0V, RL=4Ω
0.425W @ VDD=3.0V, RL=8Ω
0.60W @ VDD=3.0V, RL=4Ω
0.30W @ VDD=2.6V, RL=8Ω
0.40W @ VDD=2.6V, RL=4Ω
z Ultra low shutdown current
z Improved pop & click noise eliminating
function
z No need for output coupling or bootstrap
capacitors
z 2.2 -5.5V operation supply voltage
z Thermal protection
z External gain configuration capability
z Pd free MSOP-8, DFN-8, and SMD-9
packages
z Unity-gain stable
ORDERING INFORMATION
Pd-Free
PACKAGE
TEMPERATURE ORDER PART NUMBER
MSOP-8
-40oC to 85 oC
PT5301EMSO
SMD-9
-40oC to 85 oC
PT5301ESMD
DFN-8
-40oC to 85 oC
PT5301EQFN
TRANSPORT
MEDIA
Tape and Reel
Tape and Reel
Tape and Reel
MARKING
PT5301
XXXXXC
P5301
XXXXX
PT5301
XXXXXC
TYPICAL APPLICATION
Ci
0.39μ
Ri
20k
Ω
CB
1μF
Shutdown
control
RF
20kΩ
-I
+I +
CS
1μ
VD
Vo1
20kΩ
20kΩ
Bypass
BIA
Shutdown
+
GND
Vo
8
Figure 1. Typical Audio Amplifier Application Circuit.
KEY PERFORMANCE CHART
THD+N vs Output Power
10 VDD=5.0V,RL=4.0ohm, f=1KHz
1
0.1
0.01
10
100
Output Power(mW)
1000
3000
China Resources Powtech (Shanghai) Limited
PT5301_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page1
1 page  
PT5301
2 Watts Audio Power Amplifier
ELECTRICAL CHARACTERISTICS VDD = 2.6V (Continued) (Notes 7, 8)
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. TA = 25˚C.
SYMBOL
ITEMS
CONDITIONS
TYPICAL LIMIT UNITS
Twu Wake-up time
153 ms
THD
PSRR
Ro
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
Resistor Output to GND (Note 10)
Po=0.15Wrms; f=1k,
8Ω Load
0.05
Input terminated with 66 (f=217),
10Ω,
68 (f=1k)
V 200 V
i
11.0
9.7
12.5
%
dB
kΩ(min)
kΩ(max)
Note 7: Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications
are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device
performance.
Note 8: “Typical” means that measured at 25˚C and represent the parametric norm. “Limit” indicates that are
guaranteed by PowTech’s quality control standards. Datasheet min/max specification limits are guaranteed by design,
test, or statistical analysis.
Note 9: For micro SMD package, shutdown current is measured in a Normal Room Environment. Exposure to direct
sunlight will increase ISD by a maximum of 2µA.
Note 10: RO is measured from the output pin to ground. This value represents the parallel combination of the 15kΩ
output resistors and the two 20kΩ resistors.
EXTERNAL COMPONENTS DESCRIPTION
Ci
0.39μF
Ri 20k
Ω
RF 20k
Ω
-IN
+IN +
VDD
CS
1μF
Vo1
20kΩ
20kΩ
CB
1μF
Shutdown
control
Bypass
Shutdown
BIAS
+
GND
Vo2
Figure 1. Typical Audio Amplifier Application Circuit.
8Ω
China Resources Powtech (Shanghai) Limited
PT5301_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page5
5 Page 
microprocessor output is used to control the shutdown
circuitry, which provides a quick, smooth transition to
shutdown. Another solution is to use a single-throw
switch in conjunction with an external pull-up resistor
(or pull-down, depending on shutdown high or low
application). This scheme guarantees that the shutdown
pin will not float, thus preventing unwanted state
changes.
Proper Selection of External Components
Proper selection of external components in applications
using integrated power amplifiers is critical to optimize
device and system performance. While the PT5301 is
tolerant of external component combinations,
consideration to component values must be used to
maximize overall system quality.
The PT5301 is unity-gain stable which gives the
designer maximum system flexibility. The PT5301
should be used in low gain configurations to minimize
THD+N+N values, and maximize the signal to noise
ratio. Low gain configurations require large input
signals to obtain a given output power. Input signals
equal to or greater than 1Vrms are available from
sources such as audio codecs. Please refer to the section,
Audio Power Amplifier Design, for a more complete
explanation of proper gain selection.
Besides gain, one of the major considerations is the
closed loop bandwidth of the amplifier. To a large
extent, the bandwidth is dictated by the choice of
external components shown in Figure1. The input
coupling capacitor, Ci, forms a first order high pass
filter which limits low frequency response. This value
should be chosen based on needed frequency response
for a few distinct reasons.
Large input capacitors are both expensive and space
hungry for portable designs. Clearly, a certain sized
capacitor is needed to couple in low frequencies
without severe attenuation. But in many cases the
speakers used in portable systems, whether internal or
external, have little ability to reproduce signals below
100Hz to 150Hz. Thus, using a large input capacitor
may not increase actual system performance.
In addition to system cost and size, click and pop
performance is effected by the size of the input
coupling capacitor, i. A larger input coupling capacitor
requires more charge to reach its quiescent DC voltage
(nominally 1/2 VDD). This charge comes from the
output via the feedback and is apt to create pops upon
device enable. Thus, by minimizing the capacitor size
based on necessary low frequency response, turn-on
pops can be minimized.
Besides minimizing the input capacitor size, careful
PT5301
2 Watts Audio Power Amplifier
consideration should be paid to the bypass capacitor
value. Bypass capacitor, CB, is the most critical
component to minimize turn-on pops since it
determines how fast the PT5301 turns on. The slower
the PT5301’s outputs ramp to their quiescent DC
voltage (nominally 1/2 VDD), the smaller the turn-on
pop. Choosing CB equal to 1.0µF along with a small
value of Ci (in the range of 0.1µF to 0.39µF), should
produce a virtually pop & click free shutdown function.
While the device will function properly, (no oscillations
or motorboating), with CB equal to 0.1µF, the device
will be much more susceptible to turn-on clicks and
pops. Thus, a value of CB equal to 1.0µF is
recommended in all but the most cost sensitive designs.
Audio Power Amplifier Design
A 1W/8Ω Audio Amplifier
Given:
Power Output
Load Impedance
Input Level
Input Impedance
Bandwidth
1Wrms
8Ω
1Vrms
20kΩ
100Hz–20kHz ± 0.25dB
5V is a standard voltage in most applications, it is
chosen for the supply rail. Extra supply voltage creates
headroom that allows the PT5301 to reproduce peaks in
excess of 1W without producing audible distortion. At
this time, the designer must make sure that the power
supply choice along with the output impedance does
not violate the conditions explained in the Power
Dissipation section.
Once the power dissipation equations have been
addressed, the required differential gain can be
determined from Equation 2.
( )AVD = PO PL /(VIN ) = Vorms / Vinrms
RF / Ri = AVD / 2
(2)
From Equation 2, the minimum AVD is 2.83; use AVD
=3. Since the desired input impedance was 20kΩ, and
with an AVD impedance of 2, a ratio of 1.5:1 of RF to Ri
results in an allocation of Ri = 20kΩ and RF = 30kΩ.
The final design step is to address the bandwidth
requirements which must be stated as a pair of −3dB
frequency points. Five times away from a −3dB point is
0.17dB down from passband response which is better
than the required ±0.25dB specified.
fL = 100Hz/5 = 20Hz
fH = 20kHz×5= 100kHz
China Resources Powtech (Shanghai) Limited
PT5301_DS Rev EN_1.3
WWW.CRPOWTECH.COM
Page11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet PT5301EMSO.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| PT5301EMSO | 2 Watts Audio Power Amplifier | Powtech |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |