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PDF PAM8603M Data sheet ( Hoja de datos )
| Número de pieza | PAM8603M | |
| Descripción | 3W Filterless Stereo Class-D Audio Amplifier | |
| Fabricantes | Power Analog Micoelectronics | |
| Logotipo |  |
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Features
n 3W Output at 10% THD with a 4Ω Load and
www.datashee5tV4u.Pcoomwer Supply
n Filterless, Low Quiescent Current and Low
EMI
n Low THD+N
n 64-Step DC Volume Control from -75dB to
+24dB
n Superior Low Noise
n Efficiency up to 89%
n Short Circuit Protection
n Thermal Shutdown
n Few External Components to Save the
Space and Cost
n Pb-Free Package
Applications
n LCD Monitors/TV Projectors
n Notebook Computers
n Portable Speakers
n Portable DVD Players, Game Machines
n Cellular Phones/Speaker Phones
General Description
The PAM8603M is a 3W, sterero, class-D audio
amplifier with DC volume control. It offers low
THD+N, allowing it to produce high-quality sound
reproduction. The new filterless architecture
allows the device to drive the speaker directly,
requiring no low-pass output filters, which saves
the system cost and PCB area.
With the same numbers of external components,
the efficiency of the PAM8603M is much better
than class-AB cousins. It can extend the battery
life thus ideal for portable applications.
The PAM8603M is available in SSOP-24 and
SOP-18 packages.
Typical Application Circuit
PVDDL 10μF
1μF
PVDDL
+OU TL
PGNDL
+OUTR
-OUTL
-OUTR
0.47μF
INL INL
INR
PAM8603M
1μF
VREF
VDD
ON
SHDN
ON
MUTE
SHDN
VDC
MUTE
VOLUME
PVDDR PGNDR GND
1μF
0.47μF
INR
VDD
1μF
50kO
10μF
PVDDR
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs Output Power
RL=4Ω
RL=8Ω
0.5 1 1.5 2 2.5
Output Pow er(W)
Radiated Emissions
3
FCC Class B Limit
Power Analog Microelectronics,Inc
www.poweranalog.com
1
10/2008 Rev 1.0
1 page  
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Typical Operating Characteristics (TA=25°C)
www.datashe1e.t4Euf.cfiocmiency VS Output Power
100
90
80
70 V =DD 5V
60
50
40 VDD=3.6V
30
20
10
0
RL=8Ω
0 0.5 1 1.5 2
Output Pow er (W)
2. Efficiency VS Output Power
100
90
80
70
60 V =DD 5V
50 V =DD 3.6V
40
30
20
10
0 RL=4Ω
0 0.5 1 1.5 2 2.5 3
Output Pow er (W)
3.THD+N VS Output Power
30
RL=8Ω
10 Gain=20dB
5 f=1kHz
2 VDD=5V
1
% 0.5
VDD=3.6V
0.2
0.1
0.05
0.02
0.01
10m
20m
50m 100m 200m
W
500m 1
24
5. THD+N VS Frequency
10
Po=0.5W
5 RL=8Ω
Cin=0.47μF
Gain=20dB
2
%1
0.5
V =DD 5V
0.2
V =DD 3.6V
0.1
20
50 100 200
500 1k
2k
5k 10k 20k
Hz
4.THD+N VS Output Power
30
20
10
RL=4Ω
Gain=20dB
5 f=1kHz
VDD=5V
2
1
% 0.5
VDD=3.6V
0.2
0.1
0 05
.
0.02
0.01
10m
20m
50m
100m 200m
W
500m
1
24
6. THD+N VS Frequency
10
Po=1W
5 RL=4Ω
Cin=0.47μF
Gain=20dB
2
1
%
0.5
0.2
VDD=3.6V
0.1
0.08
20
50 100 200
500
Hz
1k
2k
V =DD 5V
5k 10k 20k
Power Analog Microelectronics,Inc
www.poweranalog.com
5
10/2008 Rev 1.0
5 Page 
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Over Temperature Protection
Thermal protection on the PAM8603M prevents
the device from damage when the internal die
wwwt.edmatapseheraett4uur.ceomexceeds 135°C. There is a 15 degree
tolerance on this trip point from device to device.
Once the die temperature exceeds the thermal set
point, the device outputs are disabled. This is not
a latched fault. The thermal fault is cleared once
the temperature of the die is reduced by 30°C.
This large hysteresis will prevent motor boating
sound well. The device begins normal operation
at this point without external system interaction.
How to Reduce EMI (Electro Magnetic
Interference)
A simple solution is to put an additional capacitor
1000μF at power supply terminal for power line
coupling if the traces from amplifier to speakers
are short (<20cm).
Most applications require a ferrite bead filter as
shown at Figure 3. The ferrite filter reduces EMI of
around 1 MHz and higher. When selecting a ferrite
bead, choose one with high impedance at high
frequencies, and low impedance at low
frequencies (MH2012HM221-T).
OUT+
Ferrite Bead
200pF
OUT-
Ferrite Bead
200pF
PCB Layout Guidelines Grounding
At this stage it is paramount to notice the
necessity of separate grounds. Noise currents in
the output power stage need to be returned to
output noise ground and nowhere else. Were
these currents to circulate elsewhere, they may
get into the power supply, the signal ground, etc,
even worse, they may form a loop and radiate
noise. Any of these cases results in degraded
amplifier performance. The logical returns for the
output noise currents associated with Class-D
switching are the respective PGND pins for each
channel. The switch state diagram illustrates that
PGND is instrumental in nearly every switch
state. This is the perfect point to which the output
noise ground trace should return. Also note that
output noise ground is channel specific. A two-
channel amplifier has two seperate channels and
consequently must have two seperate output
noise ground traces. The layout of the PAM8603M
offers separate PGND connections for each
channel and in some cases each side of the
bridge. Output noise grounds must be tied to
system ground at the power exclusively. Signal
currents for the inputs, reference, etc need to be
returned to quite ground. This ground is only tied
to the signal components and the GND pin, and
GND then tied to system ground.
Figure 3: Ferrite Bead Filter to Reduce EMI
Power Analog Microelectronics,Inc
www.poweranalog.com
11
10/2008 Rev 1.0
11 Page | ||
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| PDF Descargar | [ Datasheet PAM8603M.PDF ] | |
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