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PDF PAM8002 Data sheet ( Hoja de datos )
| Número de pieza | PAM8002 | |
| Descripción | 3W Filterless Mono Class D Audio Power Amplifier | |
| Fabricantes | Power Analog Microelectronics | |
| Logotipo |  |
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PAM8002
Ultra Low EMI, 3W Filterless Mono Class D
Audio Power Amplifier with Anti-saturation
Key Features
n One-side Modulation Active Emissions
Significantly Reduce EMI
n Unique Anti-saturation Technology with
Maximum Output Power Setting Reduce
Distortion and Protect Speaker to be
Damaged
n High Efficiency up to 89% with an 8Ω
Speaker
n 3W@10% THD Output with a 4Ω Load at 5V
Supply
n Maximum Output Power Adjuastable
n Minimized “Click and Pop”Noises
n Superior Low Noise without Input
n Supply Voltage from 2.5V to 5.5 V
n Short Circuit Protection
n Thermal Shutdown
n Available in Space Saving Packages:
1.45mmx1.45mm WCSP9, MSOP-8L,
Pb-Free Package
Applications
n Cellular Phones/Smart Phones
n MP4/MP3
n GPS
n Digital Photo Frame
n Electronic Dictionary
n Portable Game Machines
General Description
The PAM8002 is a 3W mono filterless class-D
amplifier with high PSRR and differential input
that reduce noise.
Features like 89% efficiency and small PCB area
make the PAM8002 Class-D amplifier ideal for
cellular handsets. The filterless architecture
requires no external output filter, fewer external
components, less PCB area and lower system
costs, and simplifies application design.
The PAM8002 features anti-saturation function
which detect output signal clip due to the over
input level and keep the output non-saturation
automatcally and the release time is selectable,
that to get the excellent sound quality and prevent
the speaker to be damaged. Additionally, the
maximum output power is adjusted by one
external resistor make the PAM8002 an flexible
choice for kinks of application.
The PAM8002 features short circuit protection
and over temperature protection.
The PAM8002 is available in tiny WCSP-9 and
MSOP-8L packages.
Typical Application Circuit
VDD
1μF
VDD
VIN
0 . 1μF
IN+
OUT+
0.1 μF
IN- PAM8002
CTRL
1 μF
CTRL
VREF
PGND
O U T-
GND
Power Analog Microelectronics, Inc
www.poweranalog.com
1
05/2010 Rev1.0
1 page  
PAM8002
Ultra Low EMI, 3W Filterless Mono Class D
Audio Power Amplifier with Anti-saturation
Electrical Characteristic (continued)
TA=25°C, VDD=5V, VREF=2.5V, Gain=24dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.
Symbo l
Parameter
η Efficienc y
IQ Quiescent Current
ISD Shutdown Current
Static Drain-to-source
Rdson
On-state Resistor
Rin Internal Input Resistance
fsw Switching Frequenc y
Gv Clos ed-loop Gain
Vos Output Offset Voltage
Turn-on time from
T ON
Shutd ow n
Test Conditions
RL=8Ω, THD=10%
RL=4Ω, THD=10%
f= 1kHz
VDD=5V
VDD=3.6V
R =8Ω
VDD=2.5V
VDD=3V to 5V
VSD=0.3V
CSP package，High Side VDD=5V
PMOS plus Low Side VDD=3.6V
NMOS, I=500mA
VDD=2.5V
MSOP/DFN package， VDD=5V
High Side PMOS plus VDD=3.6V
Low Side NMOS,
I=5 00 m A
VDD=2.5V
MIM
85
83
VDD= 5V
VDD= 5V
Input ac-ground,VDD=5V
VDD=5V
200
TYP
89
86
5.6
4.4
3.0
0.5
280
300
350
365
385
M AX
1
350
375
400
420
450
450 500
18
250 300
24
10 50
32
U NIT
%
mA
µA
mΩ
mΩ
kΩ
kH z
dB
mV
mS
Power Analog Microelectronics, Inc
www.poweranalog.com
5
05/2010 Rev1.0
5 Page 
PAM8002
Ultra Low EMI, 3W Filterless Mono Class D
Audio Power Amplifier with Anti-saturation
Application Information
Input Resistance (Ri)
The input resistors (Ri=Rin+Rex) set the gain of
the amplifier according to Equation 1.
G=20 Log [2*150K/(Rin+Rex)] (DB)
Where Ri is a 18K internal resistor, Re is the
external input resistor. Resistor matching is very
important in fully differential amplifiers. The
balance of the output on the reference voltage
depends on matched ratios of the resistors.
CMRR, PSRR, and cancellation of the second
harmonic distortion diminish if resistor mismatch
occurs. Therefore, it is recommended to use 1%
tolerance resistors or better to keep the
performance optimized. Matching is more
important than overall tolerance. Resistor arrays
with 1% matching can be used with a tolerance
greater than 1%.
the input to the amplifier that reduces useful
headroom, especially in high gain applications.
For this reason, a low-leakage tantalum or
ceramic capacitor is the best choice. When
polarized capacitors are used, the positive side
of the capacitor should face the amplifier input in
most applications as the DC level is held at VDD/2,
which is likely higher than the source DC level.
Please note that it is important to confirm the
capacitor polarity in the application.
Decoupling Capacitor (CS )
The PAM8002 is a high-performance CMOS
audio amplifier that requires adequate power
supply decoupling to ensure the output total
harmonic distortion (THD) as low as possible.
Power supply decoupling also prevents the
oscillations causing by long lead length between
the amplifier and the speaker.
Place the input resistors very close to the
PAM8002 to limit noise injection on the high-
impedance nodes.
For optimal performance the gain should be set
to 2X(Ri=150k) or lower. Lower gain allows the
PAM8002 to operate at its best, and keeps a high
voltage at the input making the inputs less
susceptible to noise. In addition to these
features, higher value of Ri minimizes pop noise.
Input Capacitors (Ci )
The optimum decoupling is achieved by using
two different types of capacitors that target on
different types of noise on the power supply
leads. For higher frequency transients, spikes, or
digital hash on the line, a good low equivalent-
series-resistance (ESR) ceramic capacitor,
typically 1μF, is placed as close as possible to
the device each VDD and PVDD pin for the best
operation. For filtering lower frequency noise
signals, a large ceramic capacitor of 10μF or
greater placed near the audio power amplifier is
recommended.
In the typical application, an input capacitor, Ci,
is required to allow the amplifier to bias the input
signal to the proper DC level for optimum
operation. In this case, Ci and the minimum input
impedance Ri form is a high-pass filter with the
corner frequency determined in the follow
equation:
fC
=
1
(2 p Ri Ci)
It is important to consider the value of Ci as it
directly affects the low frequency performance of
the circuit. For example, when Ri is 150kΩ and
the specification calls for a flat bass response
are down to 150Hz. Equation is reconfigured as
followed:
Ci
=
1
(2p Rifc )
When input resistance variation is considered,
the Ci is 7nF, so one would likely choose a value
of 10nF. A further consideration for this capacitor
is the leakage path from the input source through
the input network (Ci, Ri + Rf) to the load. This
leakage current creates a DC offset voltage at
Power Analog Microelectronics, Inc
How to Reduce EMI
Most applications require a ferrite bead filter for
EMI elimination shown at Figure 1. The ferrite
filter reduces EMI around 1MHz and higher.
When selecting a ferrite bead, choose one with
high impedance at high frequencies, but low
impedance at low frequencies.
O UT+
Fe rr ite Bea d
O UT-
Ferr ite Bea d
20 0p F
20 0p F
Figure 1: Ferrite Bead Filter to Reduce EMI
Shutdown operation
In order to reduce power consumption while not
in use, the PAM8002 contains shutdown circuitry
www.poweranalog.com
05/2010 Rev1.0
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet PAM8002.PDF ] | |
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