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PDF PT5322TSOP Data sheet ( Hoja de datos )
| Número de pieza | PT5322TSOP | |
| Descripción | Dual 2.2W Audio Amplifier plus Stereo Headphone Function | |
| Fabricantes | Powtech | |
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PT5322
Dual 2.2W Audio Amplifier
plus Stereo Headphone Function
GENERAL DESCRIPTION
The PT5322 is a dual bridge-connected audio power
amplifier which, when connected to a 5V supply, will
deliver 2.1W to a 4Ω load or 2.4W to a 3Ω load with
less than 1.0% THD+N. In addition, the headphone
input pin allows the amplifiers to operate in
single-ended mode when driving stereo headphones.
The PT5322 has a HP (headphone) enable input, which
activates the single ended headphone mode and disables
the BTL output mode. The HP_Sense input is for use
with a normal stereo headphone jack.
The PT5322 features a low-power consumption
shutdown mode and thermal shutdown protection. It
also utilizes circuitry to reduce “pop and click” during
device turn-on. The PT5322 is available in a 16 or 20
pin TSSOP package.
ORDERING INFORMATION
FEATURES
z PO@1% THD+N:
3Ω, 4Ω loads: 2.2W (typ), 2.0W (typ)
8Ω load: 1.3W (typ)
z SE mode THD+N@75mW into 32Ω: 0.01%(max)
z Shutdown current: 0.7µA (typ)
z Supply voltage range: 2.5V to 5.5V
z PSRR@217Hz: 80dB (typ)
z Stereo headphone amplifier mode
z “Click and pop” suppression circuitry
z Unity-gain stable
z Thermal shutdown protection circuitry
z TSSOP and SOP packages
APPLICATIONS
z Cell phones
z Multimedia monitors
z Portable and desktop computers
z Portable audio systems
PACKAGE
TSSOP-16
TEMPERATURE
RANGE
-40 oC to +85 oC
ORDERING PART
NUMBER
PT5322TSOP
SOP-16
-40 oC to +85 oC
PT5322 ESOP
Note:
xxxxxX
Assembly Factory Code
Lot Number
TRANSPORT
MEDIA
Tape and Reel,
3000 units
Tube, 60 units
Tube, 45 units
MARKING
PT5322
xxxxxX
PT5322
xxxxxX
TYPICAL APPLICATION
INA
BNC
R3
20K
C1
0.22uF
R1
20K
CB
0.33uF
INB
BNC
C2
0.22uF
R2
20K
R4
20K
VDD C5
1uF
VDD SHDN
-INA
-OUTA
+OUTA
+INA
BYPASS HP_Sense
C3
+
100uF
R11
1K
+
VCC
R13
R12 100K
100K
Phone Jack
(Stereo)
-INB
+INB
GND
-OUTB
+OUTB
+
C4
+
100uF
R10
1K
Figure 1. Typical Audio Amplifier Application Circuit
China Resources Powtech (Shanghai) Limited
PT5322_DS Rev EN_1.0
WWW.CRPOWTECH.COM
Page 1
1 page  
PT5322
Dual 2.2W Audio Amplifier
plus Stereo Headphone Function
ELECTRICAL CHARACTERISTICS (VDD = 3V) (Note 4,5,9)
SYMBOL
IDD
ISD
VIH
VIL
VIHSD
VILSD
TWU
PARAMETER
Quiescent Power
Supply Current
Shutdown Current
Headphone Sense High Input
Voltage
Headphone Sense Low Input
Voltage
Shutdown High Input Voltage
Shutdown Low Input Voltage
Turn On Time
CONDITIONS
VIN=0, IO=0A, BTL mode
VIN=0, IO=0A, SE mode
VSHDN=VDD
1uF Bypass Cap
MIN
1.4
TYP
4.5
2.5
0.1
2.2
1.5
1
0.8
200
MAX UNIT
mA
1 uA
V
V
V
0.4 V
ms
ELECTRICAL CHARACTERISTICS FOR BTL MODE OPERATION (Note 4,5,9)
SYMBOL PARAMETER
VOS Output Offset Voltage
PO
Output Power
(Note 7, 8)
THD+N
Total Harmonic
Distortion + Noise
PSRR
Power Supply
Rejection Ratio
XTALK
VNO
Channel Separation
Output Noise Voltage
CONDITIONS
VIN=0V
THD+N=1%, f=1KHz, RL=3Ω
THD+N=1%, f=1KHz, RL=4Ω
THD+N=1%, f=1KHz, RL=8Ω
THD+N=10%, f=1KHz, RL=3Ω
THD+N=10%, f=1KHz, RL=4Ω
THD+N=10%, f=1KHz, RL=8Ω
1KHz, RL=4Ω, PO=280mW
1KHz, RL=8Ω, PO=200mW
Input Unterminated,217Hz,
VRIPPLE=200mVp-p,CB=1uF, RL=8Ω
Input Unterminated,1KHz,
VRIPPLE=200mVp-p,CB=1uF, RL=8Ω
Input grounded, 217Hz,Vripple=200mVp-p,
CB=1uF, RL=8Ω
Input grounded, 1KHz,
VRIPPLE=200mVp-p, CB=1uF, RL=8Ω
f=1KHz, CB=1uF, 3D_Control = Low
1KHz, A-weighted
MIN
TYP
5
0.82
0.70
0.43
1.0
0.85
0.53
0.10
0.05
80
80
65
70
80
20
MAX UNIT
mV
W
%
dB
dB
dB
dB
dB
uV
China Resources Powtech (Shanghai) Limited
PT5322_DS Rev EN_1.0
WWW.CRPOWTECH.COM
Page 5
5 Page 
PT5322
Dual 2.2W Audio Amplifier
plus Stereo Headphone Function
APPLICATION INFORMATION
Bridge Configuration Explanation
As shown in Figure1, the PT5322 has two internal
operational amplifiers per channel. The first amplifier’s
gain is externally configurable, while the second
amplifier is internally fixed in a unity-gain, inverting
configuration. The closed-loop gain of the first amplifier
is set by selecting the ratio of Rf to Ri while the second
amplifier’s gain is fixed by the two internal 20kΩ
resistors. Figure1shows that the output of amplifier one
serves as the input to amplifier two which results in both
amplifiers producing signals identical in magnitude, but
out of phase by 180˚. Consequently, the differential gain
for the IC is
AVD = 2 * ( Rf/Ri )
or
AVD = 2 * ( R3/R1 )
(1)
or
AVD = 2 * ( R4/R2 )
By driving the load differentially through outputs
+OUTA and –OUTA (or +OUTB, -OUTB), an amplifier
configuration commonly referred to as “bridged mode”
is established. Bridged mode operation is different from
the classical single-ended amplifier configuration where
one side of the load is connected to ground.
A bridge amplifier design has a few distinct advantages
over the single-ended configuration, as it provides
differential drive to the load, thus doubling output swing
for a specified supply voltage. Four times the output
power is possible as compared to a single-ended
amplifier under the same conditions. This increase in
attainable output power assumes that the amplifier is not
current limited or clipped. In order to choose an
amplifier’s closed-loop gain without causing excessive
clipping, please refer to the Audio Power Amplifier
Design section.
A bridge configuration, such as the one used in PT5322,
also creates a second advantage over single-ended
amplifiers. Since the differential outputs, +OUTA and
–OUTA (or +OUTB, -OUTB), are biased at half-supply,
no net DC voltage exists across the load. This eliminates
the need for an output coupling capacitor which is
required in a single supply, single-ended amplifier
configuration. Without an output coupling capacitor, the
half-supply bias across the load
would result in both increased internal IC power
dissipation and also possible loudspeaker damage.
Power Dissipation
Power dissipation is a major concern when designing a
successful amplifier, whether the amplifier is bridged or
single-ended. Equation (2) states the maximum power
dissipation point for a single-ended amplifier operating
at a given supply voltage and driving a specified output
load.
PDMAX = (VDD)2/(2π2RL) Single-Ended (2)
A direct consequence of the increased power delivered
to the load by a bridge amplifier is an increase in
internal power dissipation. Since the PT5322 has two
operational amplifiers per channel in one package, the
maximum internal power dissipation is 4 times that of a
single-ended amplifier. The maximum power dissipation
for a given application can be derived from the power
dissipation graphs or from Equation 3.
PDMAX = 4*(VDD)2/(2π2RL) Bridge Mode (3)
The PT5322’s power dissipation is twice that given by
Equation (2) or Equation (3) when operating in the
single-ended mode or bridge mode, respectively. Twice
the maximum power dissipation point given by Equation
(3) must not exceed the power dissipation given by
Equation (4):
PDMAX' = (TJMAX − TA)/θJA
(4)
The PT5322’s TJMAX = 150°C. The θJA of PT5322 in the
TSSOP-16 package is 105°C/W, and the θJA of PT5322
in the SOP-16 package is 80°C/W. At any given ambient
temperature TA, use Equation (4) to find the maximum
internal power dissipation supported by the IC
packaging. Rearranging Equation (4) and substituting
PDMAX for PDMAX' results in Equation (5). This equation
gives the maximum ambient temperature that still allows
maximum stereo power dissipation without violating the
PT5322’s maximum junction temperature.
TA = TJMAX – 2*PDMAX *θJA
(5)
For a typical application with a 5V power supply and an
8Ω load, the maximum ambient temperature that allows
maximum stereo power dissipation without exceeding
the maximum junction temperature is approximately
84°C or 100°C for the TSSOP-16 or SOP-16 package
China Resources Powtech (Shanghai) Limited
PT5322_DS Rev EN_1.0
WWW.CRPOWTECH.COM
Page 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet PT5322TSOP.PDF ] | |
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