T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n

1 EB-TA2022 – Rev. 1.0/03.02

EB-TA2022

CLASS-T DIGITAL AUDIO AMPLIFIER 2 CHANNEL TA2022 EVALUATION BOARD T e c h n i c a l I n f o r m a t i o n

R e v i s i o n 1 . 0 – M a r c h 2 0 0 2

G E N E R A L D E S C R I P T I O N

T h e E B - T A 2 0 2 2 V e r s i o n 4 . 0 i s a s t e r e o 1 0 0 W p e r c h a n n e l a u d i o a m p l i f i e r d e s i g n e d t o p r o v i d e a s i m p l e a n d s t r a i g h t f o r w a r d e n v i r o n m e n t f o r t h e e v a l u a t i o n o f t h e T A 2 0 2 2 a m p l i f i e r . T h i s e v a l u a t i o n b o a r d i n c l u d e s a c i r c u i t t h a t w i l l a u t o m a t i c a l l y t r i m a n y D C o f f s e t a t t h e o u t p u t a n d a r e l a y . F o r a d d i t i o n a l d o c u m e n t a t i o n o n t h e T A 2 0 2 2 , s e e t h e T A 2 0 2 2 D a t a S h e e t .

A P P L I C A T I O N S Mini/Micro Component Systems Home Theater Receivers Car stereo head units & trunk amplifiers Powered DVD Systems

B E N E F I T S More power per cubic inch for 100W per

channel design Simplifies thermal management Signal Quality comparable to linear

amplifiers Simple building block for multi-channel

design

F E A T U R E S High Power: 100W @ 4Ω, 1.0% THD+N Low Noise Floor: 150uV A-weighted Low Distortion: .02% THD+N @ 75W, 4Ω High Efficiency: 92% for 8Ω loads

87% for 4Ω loads Dynamic Range = 102dB Over-Current Protection Over and Under Voltage Protection Over Temperature Protection Single Ended Outputs

T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n

2 EB-TA2022 – Rev. 1.0/03.02

O P E R A T I N G I N S T R U C T I O N S

B O A R D C O N N E C T I O N D I A G R A M

Audio Source

OUT2AGNDOUT1

+-

TA2022

V+ Pgnd V- Vo2 GND2 GND1 Vo1 AG

ND

5V

IN

1 A

GN

D I

N2

5V

+ +- -

J2

J3

Speaker Right Speaker Left

AW

AK

E M

UT

E

J1

++ - -VNNVPP Pgnd

Three external power supplies are required to operate the EB-TA2022: VPP, VNN (referenced to Pgnd), and 5V (referenced to Agnd). The VPP and VNN form a split rail supply referenced to Pgnd. The 5V ground (Agnd) must be kept separate from the VPP and VNN ground (Pgnd). Agnd and Pgnd are joined at a common point on the EB-TA2022 near headers J2 and J3. Minimum and Maximum supply voltages are +/-20V and +/-36V, respectively, depending on the load impedance. It is not recommended that the EB-TA2022 be operated above +/-31V when driving 4Ω loads, single ended, as the internal current limit circuit may activate, causing the amplifier to mute. The VPP and VNN power supply connection, J3, is through a 7-Pin 0.156” spaced header. The female terminal housing for this header is Molex 09-50-8071. Please see TABLE 2 for header connections. The 5V power supply connection, J2, is through a 5-Pin 0.100” spaced header. The female terminal housing for this header is Molex 22-01-2057. Please see TABLE 1 for header connections.

T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n

3 EB-TA2022 – Rev. 1.0/03.02

TABLE 1 TABLE 2

OUTPUT The output connection for each channel of the EB-TA2022 is made at pins 1 – 4 of header J3. The output of the TA2022 is single-ended, therefore each output has a positive output (Vo1 and Vo2) and a ground (GND1 and GND2).

I N P U T

The input connection for each channel of the EB-TA2022 is made at pins 3 – 5 of header J2. The left and right inputs should be connected to IN1 (pin3) and IN2 (pin5). These inputs share a common ground referenced to Agnd (pin4). JUMPER SETTINGS There is a 3-pin header for the MUTE control of the TA2022. With the jumper placed in the AWAKE position the part is un-muted by grounding (AGND) the mute pin. When the jumper is placed in the MUTE position the mute pin is pulled high (5V) and the amplifier is muted. OUTPUT OFFSET NULL AND RELAY There is an automatic offset trim circuit for each channel using an LM358 op-amp. Once the LM358 trims any DC to 0Vdc a comparator allows a relay to close. GAIN SETTING The gain of the EB_TA2022 Version 4.0 is set to 18V/V. The gain of the TA2022 is the product of the input stage and the modulator stage. The input stage gain is set to unity. Before changing the gain of the TA2022, please refer to the TA2022 Amplifier Gain section of the TA2022 Data Sheet.

J 3 C o n n e c t o r P i n # C o n n e c t i o n

P i n 1 V o 1

P i n 2 G N D 1

P i n 3 G N D 2

P i n 4 V o 2

P i n 5 V N N

P i n 6 P g n d

P i n 7 V P P

J 2 C o n n e c t o r P i n # C o n n e c t i o n

P i n 1 A g n d

P i n 2 5 V

P i n 3 I N 1

P i n 4 A g n d

P i n 5 I N 2

T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n

4 EB-TA2022 – Rev. 1.0/03.02

Performing Measurements on the EB-TA2022 Version 4.0 The TA2022 operates by generating a high frequency switching signal based on the audio input. This signal is sent through a low-pass filter that recovers an amplified version of the audio input. The frequency of the switching pattern is spread spectrum in nature and typically varies between 100kHz and 1MHz, which is well above the 20Hz – 20kHz audio band. The pattern itself does not alter or distort the audio input signal, but it does introduce some inaudible components. The measurements of certain performance parameters, particularly noise related specifications such as THD+N, are significantly affected by the design of the low-pass filter used on the output as well as the bandwidth setting of the measurement instrument used. Unless the filter has a very sharp roll-off just beyond the audio band or the bandwidth of the measurement instrument is limited, some of the inaudible noise components introduced by the TA2022 amplifier switching pattern will degrade the measurement by including out of band (audio) energy. One feature of the TA2022 is that it does not require large multi-pole filters to achieve excellent performance in listening tests, usually a more critical factor than performance measurements. Though using a multi-pole filter may remove high-frequency noise and improve THD+N type measurements (when they are made with wide-bandwidth measuring equipment), these same filters degrade frequency response. The EB-TA2022 has a simple two-pole output filter with excellent performance in listening tests. (See Application Note 4 for additional information on bench testing)

Contact In format ion T R I P A T H T E C H N O L O G Y , I N C

2560 Orchard Parkway, San Jose, CA 95131 408.750.3000 - P 408.750.3001 - F

For more Sales Information, please visit us @ www.tripath.com/cont_s.htm For more Technical Information, please visit us @ www.tripath.com/data.htm

EB-TA2022 Revised: 3/18/2001 JR. Revision: Ver4.0

Bill Of Materials

Item Quantity Reference Part Digikey Part # Manufacturers Part# (Package)________________________________________________________________________________________________________________ 1 10 C33,C41,C42,C43,C48, 0.1uF;50V PCC1864CT-ND Panasonic ECJ-2VF1H104Z (SMT 0805)

C49,C3,C8,C9,C102 2 C44,C45 0.1uF;100V AVX-12061C104KAT2A (SMT 1206)3 1 C47 390pF;50V PCC391CGCT-ND PANASONIC ECJ-2VC1H391J(SMT 0805)4 1 C46 330pF;50V PCC331CGCT-ND PANASONIC ECJ-2VC1H331J(SMT 0805)5 2 C35,C36,C4,C6 3.3uF;25V P6626-ND Panasonic ECE-A25Z3R3(Thru-Hole)6 4 C37,C38,C39,C40 0.22uF;50V P4667-ND Panasonic ECQ-V1H224JL(Thru-Hole)7 2 C29,C32 220uF;50V P10326-ND Panasonic EEU-FC1H221S(Thru-Hole)8 1 C34 100uF;35V P5165-ND Panasonic ECA-1VM101(Thru-Hole)9 2 C27,C28 47uF;16V P810-ND Panasonic ECE-A1CKA470(Thru-Hole)10 1 C5 22uF, 10V P960-ND Panasonic ECE-A1AKS220(Thru-Hole)11 3 D1,D8,D9 B1100/B B1100DICT-ND Diodes Inccorporated (SMA)12 4 D5,D11,D12,D13 MURS120T3 MURS120T3 (SMT SMB)13 1 D4 1N5243 1N5243BDICT-ND 13V, 500mW, DO-3514 1 D2 1N5235 1N5235BDICT-ND 6.8V, 500mW, DO-3515 1 D3 1N4148 1N4148DICT-ND DO-3516 1 D6 LED17 1 J3 7-pin,0.156" header WM4605-ND Molex 26-48-107518 1 J2 5-pin,0.100" header WM4203-ND Molex 22-23-205119 1 J1 3-pin,0.100" header WM4001-ND Molex 22-03-2031

20 2 J9,J10 Screw Terminal 8190K-ND Keystone 819021 1 L4 100uH TK4300-ND JWMiller 6000-101k or Toko 187LY-101J22 2 L5,L6 11uH American Cores AW-690-06-44T-22-V*see note123 2 R47,R48 249Ω (SMT 0805) 24 1 R16 300Ω (SMT 0805)25 5 R30,R33,R34,R35,R50 1KΩ (SMT 0805)26 4 R36,R38,R39,R40 1.2KΩ (SMT 0805)27 2 R1,R17 3KΩ (SMT 0805)28 1 R42 8.2KΩ,1% (SMT 0805)29 4 R31,R37,R41,R52 9.1KΩ,1% (SMT 0805)30 2 R18,R19 10KΩ (SMT 0805)31 1 R8 15KΩ (SMT 0805)32 4 R32,R43,R44,R51 20KΩ, 1% (SMT 0805)33 1 R7 25KΩ (SMT 0805)34 1 R9 35KΩ (SMT 0805)35 5 R2,R10,R12,R14,R15 50KΩ (SMT 0805)36 1 R5 80KΩ (SMT 0805)37 3 R3,R11,R13 100KΩ (SMT 0805)38 1 R4 200KΩ (SMT 0805)39 3 R45,R46,R6 249KΩ,1% (SMT 0805)

40 2 R56,57 6Ω;2W P6.2W-2BK-ND (2W Thru-hole)41 1 U2 TA2022 Tripath Technology42 1 U1 LM358 LM358N-ND 8-Dip43 1 U3 LM339 LM339N-ND 14-Dip44 3 Q1,Q2,Q4 2N7000 2N7000FS-ND TO-9245 1 Q3 2N3906 2N3906-ND TO-9246 1 K1 DPDT RELAY 8A,24V PB297-ND RTE24024F47 4 CON1,CON2,CON3,CON4 3/8"STANDOFF 4801K-ND48 4 STANDOFF NUT HEX 4-40 H616-ND49 2 screw terminal(horiz.) J9,J10 8190k-nd Keystone 819050 2 screw terminal screw 1/4" 4-40 H342-ND51 2 TA2022 washer NO. 4 FLAT H734-ND52 2 TA2022 screw 3/8" 4-40 H781-ND

Note 1: Inductor selection is critical for optimal operation of the TA2022 as well as being an important component in over current protection and EMI containment. Tripath recommends the customer use a toroidal inductor for all applications with the TA2022. For typical applications we recommend the Micrometals T68-2 core or the American Cores (Amidon) T690-06. This core has a high peak current capability due to its low-m Carbonyl-E metal powder. A distributed air gap increases its' energy storage capability, Which allows for a small footprint and high current capability. The T68-2 and T690-06 cores have a 17.5mm outer diameter. Forty-four turns of 22AWG wire makes a complete single layer winding around the toroid with six to eight layers overlapping yielding an ideal value of 11uH. This widing pattern, which covers the core completely, aids in shielding the electric field. It should be noted that when multiple layers are used there may be an increase in winding capacitance, which can cause ringing and increased radiated emmisions. Winding techniques, such as bank winding, can minimize this effect. It is important that the innitial windings not be crossed over by the last few windings. If a few windings more than the single layer are required it is best to wind the core with a full single layer, back off a number of turns,and rewind over the last few windings. A larger diameter Carbonyl-E core may be used if a single layer wound core is required. If a smaller core is required, a 15.2mm outer diameter Carbonyl-E core may be substituted, though thermal requirements must be considered. Please contact Tripath Applications if there are questions pertaining to this subject.

Substitution Notes:

1- ITEM#2- This component must be .1uF, 100V with X7R material characteristic and placed close to pins 4,8 and 9,10 of TA2022 with less than 1/8" lead length to the part.

2- ITEM#7- This component should be a high frequency,low ESR capacitor. We recommend .1Ω,or less and a ripple current rating of at least 1A.

3- ITEM#22- This component should be a 10A inductor with very high linearity. Please see Data Sheetfor substitution details.

4- ITEM#12- This component should be an ultra-fast PN junction rectifier diode with a maximum Vf of 1V at 10A.

5- ITEM#11- The Bootstrap Diodes(D8,D9)should be Schottky diodes rated at least 200mA,100V,50nS.The VN10 Diode (D1) should be a Fast Recovery, switching, or Shottky diode rated at least 200mA,30V,50nS.

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

T68-2Core(22AWG)

TA2022-100

T68-2Core(22AWG)

Schematic 1 4.0

EB-TA2022 Ver. 4.0

B

1 1Friday, March 01, 2002

Title

Size Document Number Rev

Date: Sheet of

VN10FDBK

Vnse

nse1

Vpsense1

Vnsense1

VN10

FDBK

Vpse

nse1

R5120K

U2tornado_32p_zip_6

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

VBO

OT2

VN10

PGN

D

VPP2

VN10

SW

HO

2CO

M

OU

T2

VNN

2

VNN

1

OU

T1

HO

1CO

M

VPP1

VBO

OT1

VN10

FBK

AGN

D

V5 REF

VNSE

NSE

VPSE

NSE

AGN

D

V5 OAO

UT1

INV1

MU

TE

OAO

UT2

INV2

BIAS

CAP

FBKG

ND

2

FBKO

UT2

FBKG

ND

1

FBKO

UT1

HM

UTE

R319.1k

C380.22uF;50V

C363.3uF, 25V

C34100uF;35v

C2847uF;16v

C353.3uF, 25V

J10

SCREW TERMINAL

1234

R566;2W

D1B1100/B

21

R501k

C390.22uF;50V

L4100uH;JWMiller 6000-101k or Toko 187LY-101J

R529.1k

R419.1k

C47390pF;50V

D5MURS120

21

C490.1uF;16v

R57

6;2W

J91234

R4320k

C430.1uF;50v

D8B1100/B

21

L611uH

J1

HEADER 3

123

R391.2k

R4420k

STA1

STANDOFF1

STA2

STANDOFF1

R46249k

STA4

STANDOFF1

STA3

STANDOFF1

C42.1uF;16V

R45249k

J3

CON7

1234567

J2

CON5

12345

C370.22uF;50V

C330.1uF;25v

R341k

R428.2k

D11

MURS120

2 1

R47250

C41.1uF;16V

C32220uF;50V

R301k

C46330pF;50V

D13

MURS120

2 1

R48250

R361.2k

C400.22uF;50V

C29 220uF;50V

L511uH

C2747uF;16v

C440.1uF;100V

D9B1100/B

2 1

C450.1uF;100V

R331k

R401.2k

R3220K

R381.2k

C480.1uF;16v

R379.1k

D12MURS120

21

R351k

R13k

D6 LED

IN2

V-

IN2

5V

IN1

5V

Vo2b

V+

5V

Vo1b

5V

V-M

UTE

V-

V-

V+

AGnd

MUTE

IN1

V+

VN10

AGnd

AGnd

AGnd

PGnd

PGnd

PGnd

PGnd

PGnd

PGnd

HMUTE

FBKGND1

FBKGND2

Vo2a

Vo1a

AGnd

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

SCHEMATIC 2 4.0

OFFSET CORRECTION & RELAY CIRCUITB

2 2Friday, March 01, 2002

Title

Size Document Number Rev

Date: Sheet of

C63.3uF

Q12N7000

2

31

D21N5235

21

C90.1uF

R1910k

D41N5243

21

R173k

C522uF, 10V

R1550K

Q42N7000

2

31

R3100K

R250k

D31n4148

21

C100.1uF

R815k

+

-

U1ALM358

3

21

84

Q32N3906

3

2

1

C43.3uF

R725k

R4200k

R580k

+

- U3ALM339

7

61

312

R6250k

R13100k

R935k

R1250k

K1

DPDT RELAY

64

8

53

721

R11100K

R1050k

R16300

C80.1uF

+

-

U3BLM3395

42

312

+

-

U1BLM358

5

67

84

R1450k

R1810k

Q22N7000

2

31

+

-

U3DLM33911

1013

312

C70.1uF

+

-

U3CLM3399

814

312

Vo2a

FBKGND2

VCOMP

Vo1b

PGND

PGNDVCOMP

VCOMP

PGND

Vo2a

Vo1a

PGND

VCOMP

Vo1a

HMUTE

VCOMP

FBKGND1

PGND

VCOMP

V+

Vo2b

VCOMP

PGND

PGND

V+

PGND

PGND

PGND

PGND