VRQLWURQ · INTRODUCTION PIEZO AUDIO AMPLIFIERS GENERAL OVERVIEW PAA SERIES Measurements PCB(mm)...

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actual size

total thickness: 6 mm

Input voltage 5V to 25V

Fixed amplification ratio +/- 90

Output Audio Signal: Max 60 Vpp

Dimensions: 35mm on 40mm

Ideal: +input: 9Vdc +output: 40Vpp

40 x 35mm

Specifications:

Specifications:

The MAX9788's Class G technology can deliver up to 20Vpp, ideal for driving ultra-thinpiezoelectric and ceramic speakers, for portable applications such as cell phones, smartphones,and portable media players.

More information regarding the IC MAX9788 can you findon the website http://www.maxim-ic.com and in the datasheet:

http://datasheets.maxim-ic.com/en/ds/MAX9788.pdf

Amplification settings are done by the resistors R and R

3

( )dB

RRA

IN

FBV

×=

−

−4log20

−

−

+

+ =IN

FB

IN

FB

RR

RR

−+ = ININ CC

values: C = 68 nF , R FB = 200K, R IN = 10K Av = 20 log (80) = +38 dB

and

Overview Specifications:

-Class G amplifier to drive a bridge -tied-load (BTL)-Input Voltage : 5V (stable)-Input Audio Signal: 0V To 1Vpp-Output Audio Signal: Max 20Vpp-Capacitive load up to 1µF

IN F


http://www.maxim-ic.com


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Input Voltage5V

Speakeroutput

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++

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11

22

33

44

DD

CC

BB

AA

B-9100Sint-Niklaas(Belgium)

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MAX9788

+ -

CLASSG

OUTPUT

STAGE

CHARGE

PUMP

12 10 9

18

27

26

3

24

15

131620

4

14

7

21

22

FB+

IN+

IN-

C1N

C1P

PVss

FS

OUT-

OUT+

FB-

GND

CPGND

SVss

SVss

SHDN

VCC

VCC

CPVdd

IC1

1 2

SP3

Soldeerpaden

10R

R6

100K

R8

GND

10uF

C6

CPGND

0.1uF

C4

200K

R4 200K

R5

10K

R1 10K

R2

68nF

C2 68F

C1

4.7uF

C5

GND

CPGND

1 2

SP1

Soldeerpaden 1 2

SP2

Soldeerpaden

VCC

10uF

C3

GND

CPGND

0RR3

VCC

10R

R7

InputVoltage

2.7Vto5.5V

InputSignal

0VppTo1.5Vpp

OutputSignal

upto20Vpp

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ClassGPiëzoAudioAmplifier

INTRODUCTION

PIEZO AUDIO AMPLIFIERS

GENERAL OVERVIEW PAA SERIES

Measurements PCB(mm)

Model PAA-MAX9788-01 PAA-LM4960-02 PAA-StepUpBTL-01

14x16.5mm 25x25mm 40x35mm

5V 5V 5V-25V

1µF 600nF 1µF

20Vpp 24Vpp 60Vpp

Integrated step up converter

Integrated step up converter

Step up converter

Class G Class AB Class AB

Fully Differential Bridge Tied Load Bridge Tied Load

15mA 85mA40mA-400mA

(2 Watt)

Voltage input (V)

Max Voltage Output Vpp

Amplifier classification

MAX Capacitance PiezoSpeaker

Voltage Topology

Used amplifier configuration

Average current consumption of speaker

and amplifier (mA)

PAA-MAX9788-01 PAA-LM4960SQ-02 PAA-StepUpBTL-01

The Piezo Audio Amplifiers-series are a total solution to drive piezoceramic sound components. A range of different PCB sizes, amplifier topologies and maximum voltage peak to peak outputs, cover a wide solution to piezo audio amplification.

Piezo audio amplifiers are designed to handle capacitive loads and have the possibility to deliver large voltages peak to peak over the complete audio frequency range.

The heart of a piezo audio component is a ceramic piezo stone that interacts when it feels a certain voltage difference. An increase of a voltage peak to peak will have a larger piezo deformation and results in a larger sound output.

The PAA-series give a quality amplifier solution where a quality sound is needed.

For more information see the Sonitron Catalogue 2010Piezo Audio Amplifiers Page 103 - 111 (or click the link below)

http://cde.cerosmedia.com/piezo-buzzer-transducer-alarm-siren-speaker-amplif/1N4bbf4084e44f9012.cde/page/102

6

http://cde.cerosmedia.com/piezo-buzzer-transducer-alarm-siren-speaker-amplif/1N4bbf4084e44f9012.cde/page/102

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Appnote PAA-StepUpBTL-01

Piëzo-ceramic Audio AmplifiersSonitron PAA-StepUpBTL-01

SONITRON

March 2010

SONITRON N.V.R&D DEPARTMENT

Sonitron PAA-StepUpBTL-01 Amplifier

Specifications:

·ÿ Input Voltage: 5V to 25V·ÿ Fixed amplification ratio +/- 90·ÿ Output Audio Signal: Max 60Vpp·ÿ Dimensions: 35mm on 40mm

Design structure

This Piëzo-amplifier consists out of two electronic circuits.Ø� The Step Up ConverterØ� The Bridge Tied Load

The heart of the Step Up Converter is the Max688 from MAXIM. The IC is configured in thehigh-voltage non-bootstrapped mode and is used as a non-isolated power supply.

The input voltage can vary from 5V DC to 25V DC.The output is set to 30 VDC and can deliver +/- 500mA.

Datasheet:http://datasheets.maxim-ic.com/en/ds/MAX668-MAX669.pdf

The Bridge Tied Load circuit is powered by 30V. The IC OPA551 Burr- Brown product fromTexas Instruments is used for the high voltage amplification.

A Bridge Tied Load circuits is a technique to create a larger output voltage swing than thatpossible is with one Amplifier.A second amplifier inverts the signal and the load (SPS-speaker) is connected between the twooutputs (BTL = Bridge-Tied-Load)

Note that, each amplifier sees the half of the load impedance and hereby double the current,thereby doubling the dissipation within the amplifier.

Datasheet: http://focus.ti.com/lit/ds/symlink/opa551.pdf

The first amplifier is set as a non-inverting amplifier with amplification ratio A and the secondamplifier is a unity inverting amplifier -ATotal amplification of input signal that the load will see is

Values in the design: Rf = 2M and Rin = 43K => A = 46,51

Total amplification ratio is set by +/-90

Dimensions

Controlling Power dissipation

The end amplifier IC’s can become hot if the Piezo Audio Amplifier is used for a long time at60Vpp or in saturation mode. A proper cooling has to be foreseen in such cases.

A Small band of the “Gap Pad VO Soft” 1.5 mm thickness from the bergquistcompany can beused to cool down the Integrated Circuits.http://www.bergquistcompany.com/thermal_materials/gap_pad/gap-pad-VOSoft.htm

Recommendations

Input voltage of 9 Vdc and an output voltage swing of 40Vpp.

The output voltage swing is controlled by the input audio signal. For an output of +/-40Vppthe input audio signal must be +/- 0,5Vpp.

Schematics

“Sonitron Catalogue 2010”Piezo Audio Amplifiers Page 103 - 111

-Audio Signal

Speaker output

Input Voltage

-++Cooling surface



SONITRON

March 2010



Specifications:


Design structure












Dimensions




Recommendations



Schematics


-Audio Signal

Speaker output

Input Voltage

-++Cooling surface



SONITRON

March 2010



Specifications:


Design structure












Dimensions




Recommendations



Schematics


-Audio Signal

Speaker output

Input Voltage

-++Cooling surface

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VRQLWURQ · INTRODUCTION PIEZO AUDIO AMPLIFIERS GENERAL OVERVIEW PAA SERIES Measurements PCB(mm)...

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