PAM8003 滤波器无的 2.5W 双频带音频放大器说明书-USB迷|专注于互联网分享

2024年8月13日发(作者：仲孙韦)

PAM8003

FILTERLESS 2.5W CLASS-D STEREO AUDIO AMPLIFIER

Description

The PAM8003 is a 2.5W, 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 the system

cost and PCB area.

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

PAM8003 is much better than that of class-AB cousins. It can extend

the battery life, making it ideal for portable applications.

The PAM8003 is available in SO-16 package.

Pin Assignments

Features



2.5W Output at 10% THD with a 5Ω Load and 5V Power Supply

Filterless, Low Quiescent Current and Low EMI

Low THD+N

64-Step DC Volume Control

Superior Low Noise

Short Circuit Protection

Thermal Shutdown

Few External Components to Save the Space and Cost

RoHS Pass and Green Package

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)

Applications



LCD Monitors / TVs

Notebook Computers

Portable Speakers

Portable DVD Players, Game Machines

Ordering Information

Part Number

PAM8003DR

Notes:

Package Type

SO-16

Standard Package

2,500 Units/Tape & Reel

Part Marking

PAM8003

XATYWWLL

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See /quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and

Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

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Typical Applications Circuit

Pin Descriptions

Number

Name

PVDDL

-OUTL

PGNDL

+OUTL

SHDN

VREF

INL

GND

VDD

INR

VOLUME

+OUTR

PGNDR

-OUTR

PVDDR

Function

Left Channel Power Supply

Left Channel Negative Output

Left Channel Power GND

Left Channel Positive Output

Shutdown Control Input (active low)

Internal Analog Reference, Connect a Bypass Capacitor from VREF to GND

Left Channel Input

Analog Ground

Analog Power Supply

Right Channel Input

Not Connected

DC Volume Control to Set the Gain of Class-D

Right Channel Positive Output

Right Channel Power GND

Right Channel Negative Output

Right Channel Power Supply

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Functional Block Diagram

Absolute Maximum Ratings

(@T

= +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.

Parameter

Supply Voltage

Input Voltage

Maximum Junction Temperature

Storage Temperature

Soldering Temperature

Rating

6.0

-0.3 to V

+0.3

150

-65 to +150

300, 5 sec

Unit

°C

Recommended Operating Conditions

(@T

= +25°C, unless otherwise specified.)

Parameter

Supply Voltage Range

Operation Temperature Range

Junction Temperature Range

Rating

2.5 to 5.5

-40 to +85

-40 to +125

Unit

°C

Thermal Information

Package

SO-16

Symbol

Max

110

Unit

°C/W

Parameter

Thermal Resistance (Junction to Ambient)

Thermal Resistance (Junction to Case)

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Electrical Characteristics

(@T

= +25°C, V

= 5V, Gain = 24dB, R

= 8Ω, unless otherwise specified.)

Symbol

Parameter

Supply Power

Test Conditions

= 5.0V

f = 1kHz

A-weighting

No A-weighting

f = 1kHz

THD+N = 10%, f = 1kHz, R

= 4Ω

Min

2.5

No load

PMOS

NMOS

= 5V

1.5

Typ

2.5

2.2

1.65

1.3

0.16

0.12

0.17

0.26

-70

-93

4.5

4.0

3.7

0.41

0.27

210

150

Max

5.5

7.0

6.5

5.5

0.4

Units

µV

Output Power

THD+N = 1%, f = 1kHz, R

= 4Ω

THD+N = 10%, f = 1kHz, R

= 8Ω

THD+N = 1%, f = 1kHz, R

= 8Ω

= 5.0V, Po = 0.5W, R

= 8Ω

THD+N

Total Harmonic Distortion Plus

Noise

= 3.6V, Po = 0.5W, R

= 8Ω

= 5.0V, Po = 1W, R

= 4Ω

= 3.6V, Po = 1W, R

= 4Ω

= 5.0V, Inputs AC-Grounded with

= 0.47μF, Gv = 6dB

= 5V, Po = 0.5W, R

= 8Ω,

Gv = 20dB

= 5V, Gv = 6dB

= 5V, Inputs AC-Grounded with

= 0.47μF, G

= 6dB

= 8Ω, THD = 10%

= 4Ω, THD = 10%

= 5.0V

= 3.6V

= 3.0V

= 2.5V to 5.5V

= 500mA,V

= 5V

= 3V to 5V

= 0V, V

= 5V

= 5.0V

No Load, Junction Temperature

PSRR

SNR

Power Supply Ripple Rejection

Crosstalk

Signal-to-Noise

Output Noise

Efficiency

DS(ON)

fsw

OTP

OTH

Quiescent Current

Shutdown Current

Static Drain-to-Source On-State

Resistor

Switching Frequency

Output Offset Voltage

Enable Input High Voltage

Enable Input Low Voltage

Over-temperature Protection

Over-temperature Hysterisis

µA

mΩ

kHz

°C

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Typical Performance Characteristics

(@T

= +25°C, unless otherwise specified.)

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Typical Performance Characteristics

(continued) (@T

= +25°C, unless otherwise specified.)

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Typical Performance Characteristics

(cont.) (@T

= +25°C, unless otherwise specified.)

STEP Gain (dB)

0 -75 32 11.6

1 -40 33 12.0

2 -34 34 12.4

3 -28 35 12.8

4 -22 36 13.2

5 -16 37 13.6

6 -10 38 14.0

7 -7.5 39 14.4

8 -5 40 14.8

9 -2.5 41 15.2

10 0 42 15.6

11 1.5 43 16.0

12 3.0 44 16.4

13 4.0 45 16.8

14 4.4 46 17.2

15 4.8 47 17.6

16 5.2 48 18.0

17 5.6 49 18.4

18 6.0 50 18.8

19 6.4 51 19.2

20 6.8 52 19.6

21 7.2 53 20.0

22 7.6 54 20.4

23 8.0 55 20.8

24 8.4 56 21.2

25 8.8 57 21.6

26 9.2 58 22.0

27 9.6 59 22.4

28 10.0 60 22.8

29 10.4 61 23.2

30 10.8 62 23.6

31 11.2 63 24.0

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Application Information

1. When the PAM8803 works with LC filters, it should be connected with the speaker before it’s powered on, otherwise it will risk being damaged

easily.

2. When the PAM8003 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. When the PAM8003 is powered with four battery cells, it should be noted that the voltage of four

new dry or alkaline batteries is over 6.0V, higher that its operation voltage, which will probably damage the device. Therefore, its

recommended to use either four Ni-MH (Nickel Metal Hydride) rechargeable batteries or three dry or alkaline batteries.

4. One should not make the input signal too large. Large signal can cause the clipping of output signal when increasing the volume. This will

damage the device because of big gain of the PAM8004.

5. When testing the PAM8803 without LC filters by using resistor instead of speakers as the output load, the test results, e.g. THD or efficiency,

will be worse than those of using speaker as load.

Test Setup for Performance Testing

Notes:

4. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer.

5. Two 22μH inductors are used in series with load resistor to emulate the small speaker for efficiency measurement.

Power Supply Decoupling

The PAM8003 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 of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-

series-resisitance (ESR) ceramic capacitor, typically 1.0µF, works best, placing it as close as possible to the device V

terminal. For filtering

lower-frequency noise signals, a large capacitor of 20µF (ceramic) or greater is recommended, placing it near the audio power amplifier.

Input Capacitor (C

)

Large input capacitors are both expensive and space hungry for portable designs. Clearly, a certain sized capacitor is needed to couple in low

frequencies without severe attenuation. But in many cases the speakers used in portable systems, whether internal or external, have little ability

to reproduce signals below 100Hz to 150Hz. Thus, using a large input capacitor may not increase actual system performance. In this case, input

capacitor (CI) and input resistance (RI) of the amplifier form a high-pass filter with the corner frequency determined by equation below.

In addition to system cost and size, click and pop performance is affected by the size of the input the coupling capacitor, C

. A larger input

coupling capacitor requires more charge to reach its quiescent DC voltage (nominally ½ V

). This charge comes from the internal circuit via the

feedback and is apt to create pops upon device enable. Thus, by minimizing the capacitor size based on necessary low frequency response,

turn-on pops can be minimized.



2

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Application Information

(continued)

Analog Reference Bypass Capacitor (C

BYP

)

The Analog Reference Bypass Capacitor (C

BYP

) is the most critical capacitor and serves several important functions. During start-up or recovery

from shutdown mode, C

BYP

determines the rate at which the amplifier starts up. The second function is to reduce noise caused by the power

supply coupling into the output drive signal. This noise is from the internal analog reference to the amplifier, which appears as degraded PSRR

and THD+N.

A ceramic bypass capacitor (C

BYP

) with values of 0.1μF to 1.0μF is recommended for the best THD and noise performance. Increasing the

bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown.

Undervoltage Lock-Out (UVLO)

The PAM8003 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 2.0V or below, the PAM8003

outputs are disabled, and the device comes out of this state and starts to normal function when V

≥ 2.2V.

Short Circuit Protection (SCP)

The PAM8003 has short circuit protection circuitry on the outputs to prevent damage to the device when output-to-output or output-to-GND short

occurs. When a short circuit is detected on the outputs, the outputs are disabled immediately. If the short was removed, the device activates

again.

Over-temperature Protection

Thermal protection on the PAM8003 prevents the device from damage when the internal die temperature exceeds +140°C. There is a 15°

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 and the device begins normal operation at this point without external system intervention.

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 1 MHz and higher. When selecting a

ferrite bead, choose one with high impedance at high frequencies, and low impedance at low frequencies.

Figure 2. Ferrite Bead Filter to Reduce EMI

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Marking Information

Package Outline Dimensions

Please see /

for the latest version.

SO-16

SEE DETAIL 'A'

E1/2

E/2

PIN 1

Ø0.760 Depth 0.050±0.02

SEATING PLANE

01(8x)

DETAIL 'A'

GAUGE PLANE

SEATING PLANE

PAM8003

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SO-16

Dim Min Max Typ

-- 1.260 --

0.10 0.23 --

1.02 -- --

0.31 0.51 --

0.10 0.25 --

9.80 10.00 --

5.90 6.10 --

3.80 4.00 --

1.27 BSC

0.15 0.25 0.20

0.40 1.27 --

1.04 REF

0.25 BSC

0.07 -- --

3.945 REF

0.661 REF

0° 8° --

θ1

5° 15° --

θ2

0° -- --

All Dimensions in mm

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Suggested Pad Layout

Please see /

for the latest version.

SO-16

PAM8003

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PAM8003

Dimensions

Value

(in mm)

1.270

0.670

9.560

1.450

6.400

May 2017

PAM8003

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).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes

without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the

application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or

trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume

all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated

website, harmless against all damages.

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Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and

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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the

final and determinative format released by Diodes Incorporated.

LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express

written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

labeling can be reasonably expected to result in significant injury to the user.

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use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related

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