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Using The TPA0232 EVM With the Plug-N-Play Evaluation Platform

3-12

Details

3.3.4

Mute (Shutdown)/Mode

The TPA0232 EVM is equipped with a shutdown control input pin. When this
input is pulled to ground, the TPA0232 amplifier IC on the module enters the
shutdown mode and dissipates very little power. While in the shutdown mode,
the PC BEEP input is still active. When the EVM control input is tied to GND
or allowed to float, normal amplifier operation resumes.

In typical applications, as often found in notebook computers, portable audio
products, and such, the internal speakers mute when headphones are
plugged into the headphone jack, or internal speakers mute when external
speakers are connected. In applications using separate speaker and
headphone amplifiers, the one not being used can be shut down to conserve
power.

A mode control input pin on the EVM switches the TPA0232 amplifier IC
between the bridge-tied load (BTL) output mode and the single-ended (SE)
output mode. When the mode control input is tied to GND, the module operates
in the BTL output mode. When this input is tied to V

DD

, the module operates

in the single-ended output mode.

In the typical application, output mode switching allows the TPA0232 to
operate in the BTL output mode for increased power to internal speakers and
then switch to single-ended mode to drive headphones when a plug is inserted
into the headphone jack.

3.3.4.1

Headphone Jack Control Signals

The platform headphone output jack (J10) contains an internal switch that
changes the state of a pair of control lines when a plug is inserted (see
Figure 3 – 7). Each control line is pulled down by a 1-k

Ω

 resistor to ground (R4

and R5). The switch in the headphone jack pulls one line or the other up to V

DD

through a 240-

Ω

 resistor (R3) depending on whether a plug is inserted in J10

or not.

Figure 3–7. Mute/Mode and Polarity Control

J10

Headphone

Jack

R3
240 

Ω

R4
1 k

Ω

R5
1 k

Ω

JP8

JP6

U2

Power

Amplifier

Lo

Hi

Polarity

Mode

Mute

VDD

SPK

(U2–U4)

Summary of Contents for TPA0232

Page 1: ...TPA0232 Audio Power Amplifier Evaluation Module August 2001 Mixed Signal Products User s Guide SLOU073A ...

Page 2: ...design TI does not warrant or represent that any license either express or implied is granted under any patent right copyright mask work right or other intellectual property right of TI covering or relating to any combination machine or process in which such products or services might be or are used TI s publication of information regarding any third party s products or services does not constitut...

Page 3: ... handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR A...

Page 4: ...there is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 60 C The EVM is designed to operate properly with certain components above 60 C as long as the input and output ranges are maintained These components include but are not limited to linear regulators switching transistors...

Page 5: ...s equipment is intended for use in a laboratory test environment only It generates uses and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules which are designed to provide reasonable protection against radio frequency interference Operation of this equipment in other environments may cause in...

Page 6: ...vi ...

Page 7: ...2 Inputs and Gain 3 5 3 2 3 Differential Input 3 6 3 2 4 Depop Circuitry 3 7 3 2 5 BTL Operation 3 7 3 2 6 Single Ended Operation 3 7 3 3 Using The TPA0232 EVM With the Plug N Play Evaluation Platform 3 8 3 3 1 Installing and Removing EVM Boards 3 8 3 3 2 TPA0232 Module Jumper Settings and Switches 3 9 3 3 3 Signal Routing 3 11 3 3 4 Mute Shutdown Mode 3 12 3 3 5 Power Requirements 3 14 3 3 6 Inpu...

Page 8: ...7 Mute Mode and Polarity Control 3 12 3 8 Typical Headphone Plug 3 15 3 9 TPA0232 EVM Connected for Stereo BTL Output 3 16 3 10 TPA0232 EVM Connected for Stereo Single Ended Output 3 17 Tables 2 1 Typical TI Plug N Play Platform Jumper and Switch Settings for the TPA0232 2 1 2 2 Typical TPA0232 EVM Jumper Settings 2 1 2 3 Platform Jumper and Switch Settings for the TPA0232 2 3 2 4 Typical TPA0232 ...

Page 9: ...nstruments TI TPA0232 audio amplifier evaluation module SLOP274 It includes a list of EVM features a brief illustrated description of the module and a list of EVM specifications Topic Page 1 1 Feature Highlights 1 2 1 2 Description 1 3 1 3 TPA0232 EVM Specifications 1 3 Chapter 1 ...

Page 10: ...with the TI plug n play audio amplifier evaluation platform J Evaluation module is designed to simply plug into the platform automatically making all signal control and power connections J Platform provides flexible power options J Jumpers on the platform select power and module control options J Switches on the platform route signals J Platform provides quick and easy audio input and output conne...

Page 11: ...lay audio amplifier evaluation platform or to be wired directly into existing circuits and equipment when used stand alone The platform has room for a single TPA0232 evaluation module and is a convenient vehicle for demonstrating TI s audio power amplifier and related evaluation modules The EVMs simply plug into the platform which automatically provides power to the modules interconnects them corr...

Page 12: ...1 4 Introduction ...

Page 13: ...platform switch and jumper settings shown in Table 2 1 are typical for the TPA0232 EVM and will cause the TPA0232 to switch to single ended output mode when a plug is inserted into platform headphone jack J10 Table 2 1 Typical TI Plug N Play Platform Jumper and Switch Settings for the TPA0232 EVM JP6 JP7 JP8 S2 S3 P N P Platform Mode X Hi Note 2 U2 U4 Notes 1 X Don t care 2 Set S2 to ON when signa...

Page 14: ...m or both may result Figure 2 1 Quick Start Platform Map Signal Conditioning CAUTION Do not insert or remove EVM boards with power applied ICC JP4 F1 VR1 R1 JP3 JP2 JP1 AC DC J2 VCC J1 D1 D2 D3 D4 J2 J3 J4 J5 AC DC In VCC In J1 DC SOURCE LED1 VCC LED2 VDD R2 JP5 IDD B1 U6 POWER SUPPLY U3 U4 U5 U1 U2 Audio Power Amps On Off Conditioning S2 J7 J8 Right Out Left Out JP6 Mode Mute Spk U2 U4 JP8 J9 Lef...

Page 15: ...he headphone jack J10 output will be used set headphone source switch S3 to U2 U4 Table 2 3 Platform Jumper and Switch Settings for the TPA0232 EVM JP6 JP7 JP8 S2 S3 P N P Platform Mode X Hi Note 2 U2 U4 Notes 1 X Don t care 2 Set S2 to ON when signal conditioning board is installed in U1 set S2 to OFF when no signal conditioning board is installed Power supply 7 Select and connect the power suppl...

Page 16: ...he module amplifier IC in the single ended output mode regardless of the control input state set jumper S2 to ON 12 To allow the module HP LINE control input to switch the amplifier IC between using the HP pins and the LINE pins as the signal inputs set the input mode jumper S3 to OFF To keep the amplifier IC in the HP input mode regardless of the control input state set jumper S3 to ON Power Up 1...

Page 17: ...9 Power supply 1 Ensure that all external power sources are set to OFF 2 Connect an external regulated power supply set to 5 V to the module VDD and GND pins taking care to observe marked polarity Inputs and outputs 3 Ensure that audio signal source level adjustments are set to minimum 4 Connect the right left positive lead of the audio source to the module R LINE L LINE pins and the negative lead...

Page 18: ... regardless of the control input state set jumper S3 to ON Control inputs 8 To allow the amplifier IC to switch from the LINE inputs to the HP inputs when the output switches from BTL output mode to SE output mode and vice versa set jumper S4 to ON To allow the inputs and output modes to switch independently set jumper S4 to OFF Connect control lines to the various module control input pins as nee...

Page 19: ...ion information and a parts list for the TPA0232 evaluation module Topic Page 3 1 Precautions 3 2 3 2 The TPA0232 Audio Power Amplifier Evaluation Module 3 3 3 3 Using the TPA0232 EVM With the Plug N Play Evaluation Platform 3 8 3 4 Using The TPA0232 EVM Stand Alone 3 16 3 5 TPA0232 Audio Power Amplifier Evaluation Module Parts List 3 18 Chapter 3 ...

Page 20: ...m or both may result Figure 3 1 The TI Plug N Play Audio Amplifier Evaluation Platform Signal Conditioning CAUTION Do not insert or remove EVM boards with power applied ICC JP4 F1 VR1 R1 JP3 JP2 JP1 AC DC J2 VCC J1 D1 D2 D3 D4 J2 J3 J4 J5 AC DC In VCC In J1 DC SOURCE LED1 VCC LED2 VDD R2 JP5 IDD B1 U6 POWER SUPPLY U3 U4 U5 U1 U2 Audio Power Amps On Off Conditioning S2 J7 J8 Right Out Left Out JP6 ...

Page 21: ...d directly into circuits or equipment The module has single in line header connector pins mounted to the under side of the board These pins allow the module to be plugged into the TI platform which automatically makes all the signal input and output power and control connections to the module The module connection pins are on 0 1 inch centers to allow easy use with standard perf board and plug boa...

Page 22: ...4 pin TSSOP thermal surface mount package and has been designed to operate from low supply voltages between approximately 4 5 V and 5 5 V Typical applications include portable computers and multimedia systems The IC includes two separate amplifier channels each of which can operate in either the bridged tied load BTL mode or the single ended mode as selected by the SE BTL pin In the BTL mode the l...

Page 23: ... be ac grounded through a capacitor If using differential inputs line and headphone inputs must be the same A third input PC BEEP is common to both channels The TPA0232 IC monitors this input when operating in both the active and shutdown modes and automatically switches to this input when a signal is sensed In computer applications for example this allows the normal audio signal music sounds etc ...

Page 24: ...40 1 06 1 17 2 2 29 2 41 20 3 54 5 85 1 17 1 28 0 2 41 2 52 22 Since the overall gain of the amplifier is set by the internal preamp stage and not by the power amplifier stage the TPA0232 maintains the same total harmonic distortion THD at even the highest gain settings 3 2 3 Differential Input The TPA0232 line inputs allow the use of a single ended or differential audio source The differential in...

Page 25: ...s in the system The platform provides such isolated output lines from the amplifier EVM sockets directly to separate left and right speaker connectors 3 2 6 Single Ended Operation For single ended operation the module SE BTL control input pin must be held high The speaker or headphone load is connected to the module OUT output pin through a coupling capacitor and to platform system ground A 470 µF...

Page 26: ...and then only with the proper orientation Evaluation modules are easily removed from the platform by simply prying them up and lifting them out of their sockets Care must be taken however to prevent bending the pins 3 3 1 1 EVM Insertion 1 Remove all power from the evaluation platform 2 Locate socket U2 on the platform 3 Orient the module correctly 4 Carefully align the pins of the module with the...

Page 27: ...ypical applications some or all of the jumper functions are controlled by the system microcontroller or external logic Figure 3 5 TPA0232 EVM Jumpers and Switches R4 100 kΩ C12 10 µF GND GND RLINEIN PCB ENABLE SHUTDOWN VOLUME ROUT LOUT ROUT LOUT SE BTL LIN PC BEEP BYPASS GND GND RHPIN LLINEIN VDD LHPIN PVDD PVDD CLK RIN 10 9 12 11 6 5 8 7 2 1 4 3 23 22 21 20 19 18 17 16 15 14 13 24 S1 L OUT L OUT ...

Page 28: ...on the state of the SE BTL pin on the IC 3 3 2 3 S3 Input Mode Jumper To force the module amplifier IC to use the HP input regardless of the module control input state set jumper S3 to ON Jumper S3 connects the HP LINE input mode control pin on the amplifier IC directly to VDD so that when S3 is ON the IC is held in the HP input mode regardless of the state of the HP LINE module control input When...

Page 29: ...lifier in socket U5 or the signal from the TPA0232 power amplifier installed in socket U2 as determined by the setting of headphone source select switch S3 When S3 is set to the power amplifier position U2 U4 the headphone jack is connected to the TPA0232 power amplifier OUT output lines When a plug is inserted into the jack signals output through J10 are returned to platform ground requiring sing...

Page 30: ...ier IC between the bridge tied load BTL output mode and the single ended SE output mode When the mode control input is tied to GND the module operates in the BTL output mode When this input is tied to VDD the module operates in the single ended output mode In the typical application output mode switching allows the TPA0232 to operate in the BTL output mode for increased power to internal speakers ...

Page 31: ...in jumper header JP8 on the platform selects the control signal polarity by connecting either the active high or the active low line from the headphone jack to jumper JP6 When JP6 is set to mute use the following JP8 settings for the TPA0232 J To shut down the TPA0232 amplifier module when a plug is inserted into the headphone jack jumper JP8 to Lo this is the typical setting J To shut down the TP...

Page 32: ...s full power output peak current draw can be as high as 1 A Any power supply connected to the platform should be capable of providing 1 A of current to avoid clipping of the output signal during peaks Current consumption driving speakers at normal listening levels is typically 0 3 A or less The platform is equipped with overvoltage and reverse polarity supply voltage input protection in the form o...

Page 33: ...ht RCA phono jacks J7 and J9 left and right pairs of compression connectors for stripped speaker wires J8 and optionally through a miniature 1 8 inch stereo phone jack J10 for headphones The audio output lines from the power amplifiers are separate all the way to the edge of the platform output jacks J7 J8 and J9 The OUT lines from the power amplifier sockets are not tied to each other or to platf...

Page 34: ...gh current to overcome the pullup resistor on the module 100 kΩ 3 4 1 TPA0232 EVM Connected for BTL Output Figure 3 9 TPA0232 EVM Connected for Stereo BTL Output Audio Input Right Audio Input Left External Shut Down Control active low Right Left 5 V GND ROUT ROUT SE BTL S1 SHUTDOWN GND LOUT LOUT C11 C2 C13 VDD GND L IN GND L LINE L HP VDD GND R HP R LINE GND R IN C10 TPA00232 EVM Board SLOP274 U1 ...

Page 35: ...Input Right Audio Input Left 5 V GND ROUT ROUT SE BTL S1 SHUTDOWN GND LOUT LOUT C11 C2 C13 VDD GND L IN GND L LINE L HP VDD GND R HP R LINE GND R IN C10 TPA00232 EVM Board SLOP274 U1 TEXAS INSTRUMENTS R2 R1 PCBEEP C1 C12 C6 C5 C4 R3 S2 C7 C8 C9 C3 SHUTDOWN R4 S3 S4 HP LINE Table 3 3 Typical TPA0232 EVM Jumper Settings for Single Ended Stand Alone EVM S3 TPA0232 ON Note ON Shunt installed OFF Open ...

Page 36: ...zed 0805 1 C10 C13 Capacitor 10 µF 6 3 V A 2 Panasonic ECS TOJY106R Digi Key PCS1106CT ND R1 R4 Resistor 100 kΩ 1 8 W 5 0805 2 Panasonic ERJ 6GEYJ104V Digi Key P100KABK ND R3 Resistor 0 Ω 1 8 W 0805 1 Panasonic ERJ 6GEYJ200V Digi Key P02ABK ND R2 Potentiometer 50 kΩ ST SL thru hole 1 Bourns 3362P 1 503 Digi Key 3362P 503 ND S1 Switch momentary SMD 1 Panasonic P8050SCT ND Digi Key P8050SCT ND TP1 T...

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