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The TPA0202 Audio Power Amplifier Evaluation Module

3-4

Details

Figure 3–3. TPA0202 EVM Schematic Diagram

GND/HS

GND/HS

S2

NC

NC

ROUT+

LOUT+

RLINE IN

LLINE IN

HP/LINE

MUTE OUT

ROUT–

LOUT–

SE/BTL

MUTE IN

GND/HS

GND/HS

RHP IN

LHP IN

RBYPASS

LBYPASS

RVDD

LVDD

NC

SHUTDOWN

10

9

12

11

6

5

8

7

2

1

4

3

23

22

21

20

19

18

17

16

15

14

13

24

R6
100 k

Ω

R4
20 k

Ω

R3

20 k

Ω

C2

1

µ

F

C1

1

µ

F

R1

20 k

Ω

R2

50 k

Ω

C3

5 pF

LVDD

S7

LVDD

R13

510

Ω

D1

R5

100 k

Ω

C12
10

µ

F

C5
2.2

µ

F

S1

S8

LOUT–

MUTE IN

LIN

LHP

LVDD

LOUT+

R10

20 k

Ω

C7

1

µ

F

C4

2.2

µ

F

C9
2.2

µ

F

R9
20 k

Ω

R7

50 k

Ω

C8
5 pF

C6

1

µ

F

R8

20 k

Ω

S3

LVDD

R11

100 k

Ω

S4

LVDD

R12

100 k

Ω

S6

ROUT+

RIN

RHP

RVDD

HP/LINE

ROUT–

SE/BTL

S5

LVDD

C10
2.2

µ

F

C11

10

µ

F

TPA0202

3.2.1

TPA0202 Audio Amplifier IC

The TPA0202 audio amplifier IC is a CMOS device intended primarily for
bridge-tied load (BTL) operation in battery-powered applications. It is supplied
in a very small 24-pin TSSOP thermal surface-mount package and has been
designed to operate from low supply voltages (between approximately 3 V and
5.5 V) and deliver full power at distortion levels of less than 0.1% THD+N from
a 5-V supply (Figure 3 – 4). Typical applications include portable computers
and multimedia systems.

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Summary of Contents for TPA0202

Page 1: ...TPA0202 Audio Power Amplifier Evaluation Module May 1998 Mixed Signal Products User s Guide SLOU016 ...

Page 2: ...NED INTENDED AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE SUPPORT APPLICATIONS DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS Inclusion of TI products in such applications is understood to be fully at the risk of the customer Use of TI products in such applications requires the written approval of an appropriate TI officer Questions concerning potential risk applications should be dir...

Page 3: ...is 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 i...

Page 4: ...0246 Dallas Texas 75266 Order Texas Instruments docu mentation Call the PIC hotline 972 644 5580 Ask questions about product op eration or report suspected prob lems Call the PIC hotline 972 644 5580 Report mistakes in this document or any other TI documentation Send a fax to MSP Marketing Documentation Correction 972 480 3160 Or send your comments to Texas Instruments Incorporated MSP Marketing D...

Page 5: ...lifier IC 3 4 3 2 2 Depop Circuitry 3 5 3 2 3 BTL Operation 3 5 3 2 4 SIngle Ended Operation 3 6 3 2 5 Inputs and Gain 3 6 3 3 Using The TPA0202 EVM With the Plug N Play Evaluation Platform 3 7 3 3 1 Installing and Removing EVM Boards 3 7 3 3 2 TPA0202 Module Jumper Settings and Switches 3 8 3 3 3 Signal Routing 3 11 3 3 4 Mute Mode 3 12 3 3 5 Power Requirements 3 14 3 3 6 Inputs and Outputs 3 15 ...

Page 6: ...and Outputs 3 11 3 7 Mute Mode and Polarity Control 3 12 3 8 Typical Headphone Plug 3 15 3 9 TPA0202 EVM Connected for Stereo BTL Output 3 16 3 10 TPA0202 EVM Connected for Stereo Single Ended Output 3 17 Tables 2 1 Typical TI Plug N Play Platform Jumper and Switch Settings for the TPA0202 2 1 2 2 Typical TPA0202 EVM Jumper Settings 2 1 2 3 Platform Jumper and Switch Settings for the TPA0202 2 3 2...

Page 7: ... TPA0202 Audio Amplifier Evaluation Module SLOP202 It includes a list of EVM features a brief description of the module illustrated with a pictorial diagram and a list of EVM specifications Topic Page 1 1 Feature Highlights 1 2 1 2 Description 1 3 1 3 TPA0202 EVM Specifications 1 4 Chapter 1 ...

Page 8: ... and Easy Configuration 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 audi...

Page 9: ...gle in line header pins extend from the underside of the module circuit board to allow the EVM to be plugged into the TI Plug N Play 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 TPA0202 evaluation module and is a convenient vehicle for demonstrating TI s audio power amplifier and related ev...

Page 10: ...202 EVM Specifications Supply voltage range VDD 3 V to 5 5 V Supply current IDD 2 A max Continuous output power per channel PO 4 Ω BTL VDD 5 V 2 W 4 Ω BTL VDD 3 3 V 800 mW Audio input voltage VI SE 4 Vpp max BTL 0 75 Vpp max Minimum load impedance RL 3 Ω ...

Page 11: ...ings shown in Table 2 1 are typical for the TPA0202 EVM and will cause the TPA0202 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 TPA0202 EVM JP6 JP7 JP8 S2 S3 P N P Platform Mode X Hi Note 2 X Notes 1 X Don t care 2 Set S2 to ON when signal conditioning board is installed i...

Page 12: ...m or both may result Figure 2 1 Quick Start Platform Map 3 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 L...

Page 13: ... the headphone Jack J10 output will be used set Hp source switch S3 to U2 U4 Table 2 3 Platform Jumper and Switch Settings for the TPA0202 EVM JP6 JP7 JP8 S2 S3 P N P Platform Mode X Hi Note 2 X 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 supply ensure ...

Page 14: ... To keep the module amplifier IC in the single ended output mode regardless of the control input state set jumper S4 to ON 14 Set VDD bridge jumper S5 to either ON or OFF for normal operation 15 To automatically select the headphone inputs when the single ended output mode is selected by the module SE BTL control input set autosense control jumper S6 to ON To isolate the amplifier IC input select ...

Page 15: ...6 R11 C11 D1 TPA0202 SAMPLE EVM Lit SLOP202 U1 S1 S8 6 7 8 9 10 11 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 Separate right channel and left channel VDD supplies can be connected or a single supply can be used for both Inputs and outputs 3 Ensure ...

Page 16: ... power input pins together or to OFF to keep the two power inputs isolated on board 10 To automatically select the headphone inputs when the single ended output mode is selected by the module SE BTL control input set autosense control jumper S6 to ON To isolate the amplifier IC input select pin from the module output mode select control input set autosense control jumper S6 to OFF 11 Set junction ...

Page 17: ...ion information and a parts list for the TPA0202 evaluation module Topic Page 3 1 Precautions 3 2 3 2 The TPA0202 Audio Power Amplifier Evaluation Module 3 3 3 3 Using the TPA0202 EVM With the Plug N Play Evaluation Platform 3 7 3 4 Using The TPA0202 EVM Stand Alone 3 16 3 5 TPA0202 Audio Power Amplifier Evaluation Module Parts List 3 18 Chapter 3 ...

Page 18: ...rm 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 19: ...1 or wired 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...

Page 20: ... 20 kΩ C7 1 µF C4 2 2 µF C9 2 2 µF R9 20 kΩ R7 50 kΩ C8 5 pF C6 1 µF R8 20 kΩ S3 LVDD R11 100 kΩ S4 LVDD R12 100 kΩ S6 ROUT RIN RHP RVDD HP LINE ROUT SE BTL S5 LVDD C10 2 2 µF C11 10 µF TPA0202 3 2 1 TPA0202 Audio Amplifier IC The TPA0202 audio amplifier IC is a CMOS device intended primarily for bridge tied load BTL operation in battery powered applications It is supplied in a very small 24 pin T...

Page 21: ...data sheet TI Literature Number SLOS205 3 2 2 Depop Circuitry The TPA0202 amplifier IC contains internal circuitry to minimize the various turn on transients that might appear at the output during the transition from power off shutdown or mute to normal operation Output turn on transients can be virtually eliminated by sequencing the control inputs to the IC such that the TPA0202 amplifier is held...

Page 22: ...ived listening level in the headphones as from the speakers An input multiplexor in the amplifier IC selects between the two inputs according to the state of the HP LINE IC pin Gain for each input is determined by the ratio of the input resistor to the feedback resistor on the module PCB And although the input gains are fixed at the factory they can be adjusted by changing the resistor values on t...

Page 23: ...he 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 socket pin receptac...

Page 24: ...s some or all of the jumper functions are controlled by the system microcontroller or external logic Figure 3 5 TPA0202 EVM Jumpers and Switches GND HS GND HS S2 NC NC ROUT LOUT RLINE IN LLINE IN HP LINE MUTE OUT ROUT LOUT SE BTL MUTE IN GND HS GND HS RHP IN LHP IN RBYPASS LBYPASS RVDD LVDD NC SHUTDOWN 10 9 12 11 6 5 8 7 2 1 4 3 23 22 21 20 19 18 17 16 15 14 13 24 R6 100 kΩ R4 20 kΩ R3 20 kΩ C2 1 ...

Page 25: ...3 to OFF To select the headphone inputs set input select jumper S3 to ON The TPA0202 amplifier IC has two separate inputs for each channel An internal multiplexor selects which input will be connected to the amplifier based on the state of the HP LINE pin on the IC However the EVM HP L control input pin is not directly controlled by anything on the platform the platform socket for that module pin ...

Page 26: ...e that when autosense jumper S6 is set to ON the headphone input and the single ended output mode are selected and the SE BTL control signal will have no effect if either jumper S3 or jumper S4 are set to ON 3 3 2 7 S7 SE Output Mode Switch Pushbutton switch S7 on the TPA0202 EVM allows the manual selection of the single ended output mode When used in conjunction with mute switch S2 output thumps ...

Page 27: ...lifier in socket U5 or the signal from the TPA0202 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 TPA0202 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 28: ...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 TPA0202 to operate in the BTL output mode for increased power to internal speakers and then switch to single ended mode to ...

Page 29: ...pin 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 TPA0202 J To mute the TPA0202 amplifier module when a plug is inserted into the headphone jack jumper JP8 to Hi this is the typical setting J To mute the TPA0202 amp...

Page 30: ...uous full power output peak current draw can be as high as 2 A Any power supply connected to the platform should be capable of providing 2 A of current to avoid clipping of the output signal during peaks Current consumption driving speakers at normal listening levels is typically 0 5 A or less The platform is equipped with overvoltage and reverse polarity supply voltage input protection in the for...

Page 31: ...ght pairs of compression connectors for stripped speaker wires J8 and optionally through a miniature 1 8 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 platform ground This allows the TPA0202 power ampl...

Page 32: ...n resistor on the module 100 kΩ 3 4 1 TPA0202 EVM Connected for BTL Output Figure 3 9 TPA0202 EVM Connected for Stereo BTL Output Audio Input Right Audio Input Left External Mute Control active high Right Left GND ROUT HP L ROUT SE BTL S7 MUTE GND LOUT LOUT S2 C5 C4 R1 R3 C1 C2 C12 LVDD GND R5 GND GND LIN LHP C3 R4 R2 C10 C9 RVDD GND C8 R9 R7 R10 R8 C7 C6 RHP RIN GND GND R12 R13 S3 S4 S5 S6 R11 C1...

Page 33: ...t GND ROUT HP L ROUT SE BTL S7 MUTE GND LOUT LOUT S2 C5 C4 R1 R3 C1 C2 C12 LVDD GND R5 GND GND LIN LHP C3 R4 R2 C10 C9 RVDD GND C8 R9 R7 R10 R8 C7 C6 RHP RIN GND GND R12 R13 S3 S4 S5 S6 R11 C11 D1 TPA0202 SAMPLE EVM Lit SLOP202 U1 S1 S8 5 V 5 V Mute Table 3 2 Typical TPA0202 EVM Jumper Settings for Single Ended Stand Alone EVM S1 S3 S4 S5 S6 S8 TPA0202 X ON ON ON X OFF Note ON shunt installed OFF ...

Page 34: ...6 3 V A 2 Panasonic ECS TOJY106R Digi Key PCS1106CT ND R1 R2 R4 R8 R9 R10 Resistor 20 kΩ 1 8 W 5 0805 6 Panasonic ERJ 8GEYJ203V Digi Key P20KKABK ND R2 R7 Resistor 50 kΩ 1 8 W 5 0805 2 Panasonic ERJ 8GEYJ503V Digi Key P50KKABK ND R5 R6 R11 R12 Resistor 100 kΩ 1 8 W 5 0805 6 Panasonic ERJ 6GEYJ104V Digi Key P100KABK ND R13 Resistor 510 kΩ 1 8 W 5 0805 1 Panasonic ERJ 6GEYJ510V Digi Key P510KABK ND ...

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