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PAM8403H

Document number: DSxxxxx Rev. 1 - 0

1 of 11

www.diodes.com

November 2012

PAM8403H

A Product Line o

Diodes Incorporated

FILTERLESS 3W CLASS-D STEREO AUDIO AMPLIFIER

Description

The PAM8403H is a 3W, class-D audio amplifier. It offers low THD+N,

allowing it to achieve high quality sound reproduction. The new

filterless architecture allows the device to drive the speaker directly,

requiring no low-pass output filters, thus saving system cost and PCB

area.

With the same numbers of external components, the efficiency of the

PAM8403H is much better than that of class-AB cousins. It can

extend the battery life, ideal for portable applications.

The PAM8403H is available in SOP-16 package.

Features

 3W Output at 10% THD with a 4 Load and 5V Power Supply

 Filterless, Low Quiescent Current and Low EMI

 Low THD+N

 Superior Low Noise

 Efficiency up to 90%

 Short Circuit Protection

 Thermal Shutdown

 Few External Components to Save the

 Space and Cost

 Pb-Free Package

Applications

 LCD Monitors / TV Projectors

 Notebook Computers

 Portable Speakers

 Portable DVD Players, Game Machines

 Cellular Phones/Speaker Phones

Pin Assignments

Summary of content (11 pages)

PAGE 1
A Product Line of Diodes Incorporated PAM8403H FILTERLESS 3W CLASS-D STEREO AUDIO AMPLIFIER Description Pin Assignments The PAM8403H is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high quality sound reproduction. The new filterless architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and PCB area.
PAGE 2
A Product Line of Diodes Incorporated PAM8403H Typical Applications Circuit Pin Descriptions Pin Number Pin Name 1 -OUT_L Function Left Channel Negative Output 2 PGND 3 +OUT_L 4 PVDD Power VDD 5 MUTE Mute Control Input（active low） 6 VDD Analog VDD 7 INL Left Channel Input 8 VREF 9 NC No connected 10 INR Right Channel Input 11 GND Analog GND 12 SHDN Shutdown Control Input (active low) 13 PVDD Power VDD 14 +OUT_R 15 PGND 16 -OUT_R PAM8403H Document number: DSxxxx
PAGE 3
A Product Line of Diodes Incorporated PAM8403H Functional Block Diagram Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground.
PAGE 4
A Product Line of Diodes Incorporated PAM8403H Thermal Information Package Symbol Max Thermal Resistance (Junction to Ambient) Parameter SOP-16 θJA 110 Thermal Resistance (Junction to Case) SOP-16 θJC 23 Internal Power Dissipation (@ TA = +25°C) SOP-16 PD 90 Note: Unit °C/W mW 1. The maximun output current for SOT23-5 package is limited by internal power dissipation capacity as described in Application Information here inafter.
PAGE 5
A Product Line of Diodes Incorporated PAM8403H Typical Performance Characteristics (@TA = +25°C, unless otherwise specified.) PAM8403H Document number: DSxxxxx Rev. 1 - 0 5 of 11 www.diodes.
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A Product Line of Diodes Incorporated PAM8403H Typical Performance Characteristics (cont.) (@TA = +25°C, unless otherwise specified.) PAM8403H Document number: DSxxxxx Rev. 1 - 0 6 of 11 www.diodes.
PAGE 7
A Product Line of Diodes Incorporated PAM8403H Application Information 1. When the PAM8403H works with LC filters, it should be connected with the speaker before it's powered on, otherwise it will be damaged easily. 2. When the PAM8403H works without LC filters, it's better to add a ferrite chip bead at the outgoing line of speaker for suppressing the possible electromagnetic interference. 3. The recommended operating voltage is 5.5V.
PAGE 8
A Product Line of Diodes Incorporated PAM8403H Application Information (cont.) Power Supply Decoupling The PAM8403H is a high performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output THD and PSRR as low as possible. Power supply decoupling affects low frequency response. Optimum decoupling is achieved by using two capacitors of different types targeting to different types of noise on the power supply leads.
PAGE 9
A Product Line of Diodes Incorporated PAM8403H Application Information (cont.) 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 in Figure 2. The ferrite filter reduces EMI of around 1MHz and higher.
PAGE 10
A Product Line of Diodes Incorporated PAM8403H Marking Information Package Outline Dimensions (All dimensions in mm.) SOP-16 PAM8403H Document number: DSxxxxx Rev. 1 - 0 10 of 11 www.diodes.
PAGE 11
A Product Line of Diodes Incorporated PAM8403H IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).