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PAM8304 Schematic ( PDF Datasheet ) - Diodes

Teilenummer PAM8304
Beschreibung 3W MONO CLASS D AUDIO AMPLIFIER
Hersteller Diodes
Logo Diodes Logo 




Gesamt 11 Seiten
PAM8304 Datasheet, Funktion
A Product Line of
Diodes Incorporated
PAM8304
3W MONO CLASS D AUDIO AMPLIFIER
Description
The PAM8304 is a mono filter-less Class-D amplifier with high SNR
and differential input that helps eliminate noise. The PAM8304
supports 2.8V to 6V operation make it idea for up to 4 cells alkaline
battery applications. The PAM8304 is capable of driving speaker
loads as low as 3speaker with a 5V supply maximizing the output
power.
Features like greater than 90% efficiency and small PCB area make
the PAM8304 Class-D amplifier ideal for portable applications. The
output uses a filter-less architecture minimizing the number of
external components and PCB area whilst providing a high
performance, simple and lower cost system.
The PAM8304 features short circuit protection, thermal shutdown and
under voltage lock-out.
The PAM8304 is available in DFN3030-8L and MOP-8L packages.
Features
Supply Voltage from 2.8V to 6.0 V
3Driving Capability
3.0W@10% THD Output with a 4Load and 5V Supply
High Efficiency up to 90% @1W with an 8Load
Shutdown Current <1μA
Superior Low Noise without Input
Short Circuit Protection
Thermal Shutdown
Available in Space Saving DFN3030-8L and MSOP-8L
Packages
Pb-Free Package
Pin Assignments
D FN 3 X3 - 8 L
Top View
OUT+ 1
PVDD 2
VDD 3
IN- 4
OUT+ 1
PVDD 2
VDD 3
IN- 4
MSOP-8L
Top View
Applications
MP4/MP3
GPS
Set-Top-Box
Tablets/Digital Photo Frame
Electronic Dictionary
Portable Game Machines
8 OUT-
7 GND
6 SD
5 IN+
8 OUT-
7 GND
6 SD
5 IN+
Typical Applications Circuit
VIN
0.1μ F
0.1μ F
/SD
VDD
PVDD
1μ F
VDD
IN+ OUT+
IN- PA M 8 3 0 4
/SD
OUT-
P GND
GND
PAM8304
Document number: DS36589 Rev. 1 - 2
1 of 11
www.diodes.com
October 2013
© Diodes Incorporated






PAM8304 Datasheet, Funktion
A Product Line of
Diodes Incorporated
PAM8304
Application Information
Input Capacitors (Ci )
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 a high-pass filter with the corner frequency determined in the follow equation:
fC
2
1
RiCi
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 150kand the
specification calls for a flat bass response down to 150Hz. The equation is reconfigured as followed to determine the value of Ci:
Ci
1
2Rifc
When input resistance variation is considered, if Ci is 7nF 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 and Rf) to the load. This leakage current creates a DC offset voltage at 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 PAM8304 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.
Optimum decoupling is achieved by using two different types of capacitors that target different types of noise on the power supply leads. Higher
frequency transients, spikes or digital hash should be filtered with a good low equivalent-series-resistance (ESR) ceramic capacitor with a value of
typically 1μF. This capacitor should be placed as close as possible to the VDD pin of the device. Lower frequency noise signals should be filtered
with a large ceramic capacitor of 10μF or greater. It's recommended to place this capacitor near the audio power amplifier.
How to Reduce EMI
Most applications require a ferrite bead filter for EMI elimination as shown in Figure 1. The ferrite filter reduces EMI around 1MHz and higher.
When selecting a ferrite bead it should be chosen with high impedance at high frequencies but low impedance at low frequencies.
OUT+
OUT-
Ferrite Bead
Ferrite Bead
200pF
200pF
Figure 1 Ferrite Bead Filter to Reduce EMI
PAM8304
Document number: DS36589 Rev. 1 - 2
6 of 11
www.diodes.com
October 2013
© Diodes Incorporated

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