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PDF PT5303 Data sheet ( Hoja de datos )
| Número de pieza | PT5303 | |
| Descripción | 1.25W Mono Full Differential Audio Power Amplifier | |
| Fabricantes | Powtech | |
| Logotipo |  |
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PT5303
1.25W Mono Full Differential
Audio Power Amplifier with Shutdown Select
GENERAL DESCRIPTION
The PT5303 is a fully differential audio power
amplifier primarily designed for demanding
applications in mobile phones and other portable
communication device applications. It is capable of
delivering 1.25W of continuous average power to an
8Ω BTL load with less than 1% distortion (THD+N)
from a 5V power supply.
The PT5303 is designed specifically to provide high
quality output power with a minimal amount of external
components. The PT5303 does not require output
coupling capacitors or bootstrap capacitors, and
therefore is ideally suited for mobile phones and other
low voltage applications where minimal power
consumption is a primary requirement.
The PT5303 contains advanced pop & click circuitry
which virtually eliminates noises which would
otherwise occur during turn-on and turn-off transitions.
FEATURES
z 1.25W into 8Ω from a 5V Supply at THD=1%
(Typ.)
z Low Supply Current: 2.7mA@VDD=5V
z Shutdown Current < 1uA
z Improved PSRR at 217Hz: 80dB (Typ.)
z Fully Differential Design Reduces RF
Rectification
z Improved CMRR Eliminates Two Input Coupling
Capacitors
z Cbypass is Optional Due to Fully Differential
Design and High PSRR
z MSOP-10 and SMD-9 packages
APPLICATION
z Mobile Phones
z PDAs
z Portable electronic devices
ORDERING INFORMATION
PACKAGE
TEMPERATURE
RANGE
ORDERING PART
MSOP-10
-40 oC to 85 oC
PT5303EMSJ
SMD-9
-40 oC to 85 oC
PT5303ESMD
Note:
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORT
MEDIA
Tape and Reel
3000 units
Tape and Reel
3000 units
MARKING
PT5303
xxxxxX *
P5303
xxxxx
TYPICAL APPLICATION CIRCUIT
20K Ri1
20K Ri2
Shutdown Control
SD_Mode SD_Select
00
01
10
11
Status
shutdown
on
on
shutdown
SD_Mode
SD_Select
CBypass
1uF
20K Rf1
IN-
IN+
VDD
VO+
VO-
GND
Bypass
Bias
Circuitry
20K Rf2
Cs
1uF
China Resources Powtech (Shanghai) Limited
PT5303_DS Rev EN_1.2,
WWW.CRPOWTECH.COM
Page1
1 page  
PT5303
1.25W Mono Full Differential
Audio Power Amplifier with Shutdown Select
TYPICAL PERFORMANCE CHARACTERISTICS
Total Harmonic Distortion+Noise vs. Ouput Power
10
Total Harmonic Distortion+Noise vs. Ouput Power
10
V =5V
DD
CBypass=1uF
1
RL=8Ohm
f=1k Hz
VDD=5V
C =1uF
Bypass
1
RL=8Ohm
f=20 Hz
0.1 0.1
0.01
10
100
Output Power (mW)
1000
Total Harmonic Distortion+Noise vs. Ouput Power
10
VDD=3V
CBypass=1uF
1
RL=8Ohm
f=1k Hz
0.1
0.01
10
100
Output Power (mW)
1000
Total Harmonic Distortion+Noise vs. Ouput Power
10
VDD=3V
CBypass=1uF
1
RL=4Ohm
f=1k Hz
0.1
0.01
10
100
Output Power (mW)
1000
Total Harmonic Distortion+Noise vs. Ouput Power
10
VDD=2.6V
C =1uF
Bypass
1
RL=8Ohm
f=1k Hz
0.1
0.01
10
100
Output Power (mW)
1000
Total Harmonic Distortion+Noise vs. Ouput Power
10
VDD=2.6V
C =1uF
Bypass
1
RL=4Ohm
f=1k Hz
0.1
0.01
10
100
Output Power (mW)
0.01
10
100
Output Power (mW)
China Resources Powtech (Shanghai) Limited
PT5303_DS Rev EN_1.2,
WWW.CRPOWTECH.COM
Page5
5 Page 
PT5303
1.25W Mono Full Differential
Audio Power Amplifier with Shutdown Select
complete explanation of proper gain selection. When
used in its typical application as a fully differential
power amplifier the PT5303 does not require input
coupling capacitors for input sources with DC
common-mode voltages of less than VDD.
Special care must be taken to match the values of the
feedback resistors (Rf1 and Rf2) to each other as well
as matching the input resistors (Ri1 and Ri2) to each
other. Because of the balanced nature of differential
amplifiers, resistor matching differences can result in
net DC currents across the load. This DC current can
increase power consumption, internal IC power
dissipation, reduce PSRR, and possibly damaging the
loudspeaker. The chart below demonstrates this
problem by showing the effects of differing values
between the feedback resistors while assuming that
the input resistors are perfectly matched. The results
below apply to the application circuit shown in
Figure 1, and assumes that VDD=5V, RL=8Ω, and
the system has DC coupled inputs tied to ground.
A designer must first determine the minimum supply
rail to obtain the specified output power. The supply
rail can easily be found by extrapolating from the
Output Power vs. Supply Voltage graphs in the
Typical Performance Characteristics section. Using
the Output Power vs. Supply Voltage graph for an 8Ω
load, the minimum supply rail just about 5V. Extra
supply voltage creates headroom that allows the
PT5303 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 4.
AVD ≥ (RL Po ) /(VIN ) = Vorms / Vinrms
Rf / Ri = AVD
(4)
Tolerance
20%
10%
5%
1%
0
Rf1
0.8R
0.9R
0.95R
0.99R
R
Rf2
1.2R
1.1R
1.05R
1.01R
R
VO+-VO-
-0.5V
-0.250V
-0.125V
-0.025V
0
ILoad
62.5mA
31.25mA
15.63mA
3.125mA
0
Similar results would occur if the input resistors were
not carefully matched. Adding input coupling
capacitors in between the signal source and the input
resistors will eliminate this problem, however, to
achieve best performance with minimum component
count it is highly recommended that both the
feedback and input resistors matched to 1% tolerance
or better.
AUDIO POWER AMPLIFIER DESIGN
Design a 1W/8Ω Audio Amplifier
Given:
• Power Output
1W
• Load Impedance
8Ω
• Input Level
1Vrms
• Input Impedance
20k
• Bandwidth
100Hz~20kHz±0.25dB
From Equation 8, the minimum AVD is 2.83. Since the
desired input impedance was 20kΩ, a ratio of 2.83:1 of Rf
to Ri results in an allocation of Ri= 20kΩ for both input
resistors and Rf = 60kΩ for both feedback resistors. The
final design step is to address the bandwidth requirement
which must be stated as a single -3dB frequency point. Five
times away from a -3dB point is 0.17dB down from
passband response which is better than the required
±0.25dB specified.
fH = 20kHz*5 = 100kHz
The high frequency pole is determined by the product
of the desired frequency pole, fH, and the differential
gain, AVD.With a AVD = 2.83 and fH, = 100k Hz, the
resulting GBWP = 150k Hz which is much smaller
than the PT5303 GBWP of 10MHz. This figure
displays that if a designer has a need to design an
amplifier with a higher differential gain, the PT5303
can still be used without running into bandwidth
limitations.
China Resources Powtech (Shanghai) Limited
PT5303_DS Rev EN_1.2,
WWW.CRPOWTECH.COM
Page11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet PT5303.PDF ] | |
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