TRIPATH EB

Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
EB-TA2022
CLASS-T DIGITAL AUDIO AMPLIFIER 2 CHANNEL TA2022
EVALUATION BOARD
Technical Information
Revision 1.0 – March 2002
GENERAL DESCRIPTION
The EB-TA2022 Version 4.0 is a stereo 100W per channel audio amplifier
designed to provide a simple and straightforward environment for the evaluation
of the TA2022 amplifier. This evaluation board includes a circuit that will
automatically trim any DC offset at the output and a relay. For additional
documentation on the TA2022, see the TA2022 Data Sheet.
APPLICATIONS
Mini/Micro Component Systems
Home Theater Receivers
Car stereo head units & trunk amplifiers
Powered DVD Systems
BENEFITS
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
1
FEATURES
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
EB-TA2022 – Rev. 1.0/03.02
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
OPERATING INSTRUCTIONS
V+ Pgnd V- Vo2 GND2 GND1 Vo1
J1
Audio Source
OUT2
AGND
OUT1
+
-
J2
AGND 5V IN1 AGND IN2
TA2022
AWAKE MUTE
BOARD CONNECTION DIAGRAM
J3
+
+-
VPP
Pgnd
+-
VNN
-
Speaker Right
-
5V
+
Speaker Left
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.
2
EB-TA2022 – Rev. 1.0/03.02
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
TABLE 2
TABLE 1
J2 Connector Pin#
Connection
J3 Connector Pin#
Connection
Pin1
Agnd
Pin1
Vo1
Pin2
5V
Pin2
GND1
Pin3
IN1
Pin3
GND2
Pin4
Agnd
Pin4
Vo2
Pin5
IN2
Pin5
VNN
Pin6
Pgnd
Pin7
VPP
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).
INPUT
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.
3
EB-TA2022 – Rev. 1.0/03.02
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
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 Information
TRIPATH TECHNOLOGY, INC
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
4
EB-TA2022 – Rev. 1.0/03.02
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,C10
2
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-35
14
1
D2
1N5235
1N5235BDICT-ND
6.8V, 500mW, DO-35
15
1
D3
1N4148
1N4148DICT-ND
DO-35
16
1
D6
LED
17
1
J3
7-pin,0.156" header
WM4605-ND
Molex 26-48-1075
18
1
J2
5-pin,0.100" header
WM4203-ND
Molex 22-23-2051
19
1
J1
3-pin,0.100" header
WM4001-ND
Molex 22-03-2031
20
21
22
1
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
2
1
2
J9,J10
L4
L5,L6
Screw Terminal
100uH
11uH
2
1
5
4
2
1
4
2
1
4
1
1
5
1
3
1
3
R47,R48
R16
R30,R33,R34,R35,R50
R36,R38,R39,R40
R1,R17
R42
R31,R37,R41,R52
R18,R19
R8
R32,R43,R44,R51
R7
R9
R2,R10,R12,R14,R15
R5
R3,R11,R13
R4
R45,R46,R6
249Ω
300Ω
1KΩ
1.2KΩ
3KΩ
8.2KΩ,1%
9.1KΩ,1%
10KΩ
15KΩ
20KΩ, 1%
25KΩ
35KΩ
50KΩ
80KΩ
100KΩ
200KΩ
249KΩ,1%
8190K-ND
TK4300-ND
Keystone 8190
JWMiller 6000-101k or Toko 187LY-101J
American Cores AW-690-06-44T-22-V*see note
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
(SMT
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
0805)
40
41
42
43
44
45
46
47
48
49
50
51
52
2
1
1
1
3
1
1
4
4
2
2
2
2
R56,57
U2
U1
U3
Q1,Q2,Q4
Q3
K1
CON1,CON2,CON3,CON4
STANDOFF NUT
screw terminal(horiz.)
screw terminal screw
TA2022 washer
TA2022 screw
6Ω;2W
TA2022
LM358
LM339
2N7000
2N3906
DPDT RELAY 8A,24V
3/8"STANDOFF
HEX 4-40
J9,J10
1/4" 4-40
NO. 4 FLAT
3/8" 4-40
P6.2W-2BK-ND
LM358N-ND
LM339N-ND
2N7000FS-ND
2N3906-ND
PB297-ND
4801K-ND
H616-ND
8190k-nd
H342-ND
H734-ND
H781-ND
(2W Thru-hole)
Tripath Technology
8-Dip
14-Dip
TO-92
TO-92
RTE24024F
Keystone 8190
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 Sheet
for 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
4
3
2
1
TA2022-100
FBKOUT1
HMUTE
32
FBKOUT2
FBKGND2
BIASCAP
INV2
FBKGND1
31
30
29
28
27
OAOUT2
26
INV1
OAOUT1
V5
MUTE
25
24
23
22
AGND
21
VNSENSE
VPSENSE
20
19
REF
18
AGND
VN10FBK
V5
17
16
15
VBOOT1
VPP1
U2
14
13
OUT1
HO1COM
12
11
VNN1
10
VNN2
8
9
OUT2
HO2COM
7
VPP2
PGND
VN10SW
6
5
4
3
1
D
2
L4
100uH;JWMiller 6000-101k or Toko 187LY-101J
VN10
VBOOT2
tornado_32p_zip_6
D
HMUTE
D13
R50
1k
2
VN10FDBK
C34
100uF;35v
C33
0.1uF;25v
1
C43
0.1uF;50v
C32
220uF;50V
D12
MURS120
22
AGnd
D11
MURS120
1
0.1uF;100V
C44
R1
3k
5V
IN2
R43
20k
C45
0.1uF;100V
R42
8.2k
R48
250
C
1
2
2
V+
1
V-
R31
9.1k
5V
R30
1k
C
R35
1k
Vpsense1
R41
9.1k
R46
249k
FBKGND1
FBKGND2
C46
330pF;50V R36
1.2k
C37
0.22uF;50V
AGnd
R38
1.2k
R39
1.2k
R40
1.2k
C47
390pF;50V
V-
L6
11uH
T68-2
Core(22AWG)
R57
6;2W
C38
0.22uF;50V
R34
1k
R52
9.1k
Vo1a
B
R33
1k
Vnsense1
R37
9.1k
R56
6;2W
R45
249k
D9
B1100/B
L5
11uH
T68-2
Core(22AWG)
Vo2a
IN1
AGnd
C36
3.3uF, 25V
C28
47uF;16v
C41
.1uF;16V
D8
B1100/B
C35
3.3uF, 25V
R32
20K
C48
0.1uF;16v
R47
250
C27
47uF;16v
C42
.1uF;16V
R44
20k
C49
0.1uF;16v
220uF;50V
PGnd
R51
20K
V+
VC29
D6 LED
MUTE
D5
MURS120
MURS120
1
2
Vpsense1
D1
B1100/B
2
Vnsense1
1
VN10FDBK
1
VN10
C39
0.22uF;50V
B
C40
0.22uF;50V
PGnd
J1
5V
MUTE
J2
5V
IN1
J3
Vo1b
PGnd
Vo2b
PGnd
VA
V+
PGnd
IN2
1
2
3
4
5
6
7
PGnd
1
2
3
1
2
3
4
5
J10
J9
1
2
3
4
1
2
3
4
SCREW TERMINAL
HEADER 3
AGnd
CON5
STA1
STA2
1
1
STANDOFF
STANDOFF
STA3
STA4
1
1
STANDOFF
STANDOFF
A
AGnd
CON7
Title
EB-TA2022 Ver. 4.0
Size
B
Date:
5
4
3
2
Document Number
Schematic 1
Friday, March 01, 2002
Rev
4.0
Sheet
1
1
of
1
5
4
3
2
1
C4
3.3uF
4
U1A
LM358
2
PGND
R19
10k
1
R17
3k
VCOMP
D
V+
1
3
+
-
R7
25k
R4
200k
U3A
LM339
PGND
R15
50K
R6
250k
D2
1N5235
1
3
Q2
2N7000
5
+
4
-
2
1
2
7
Vo2a
3
8
Vo1a
5
2
Vo2b
2
6
4
Vo1b
DPDT RELAY
PGND
1
K1
R16
300
Q1
2N7000
3
C
Vo1a
U3B
LM339
2
12
3
R8
15k
Q3
2N3906
2
VCOMP
R9
35k
D3
1n4148
1
12
PGND
PGND
2
6
2
D4
1N5243
3
7
1
1
VCOMP
R5
80k
C7
0.1uF
1
VCOMP
R12
50k
FBKGND1
C10
0.1uF
V+
8
C8
0.1uF
R3
100K
+
3
D
3
R2
50k
C5
22uF, 10V
R13
100k
C
PGND
VCOMP
3
Vo2a
+
8
-
PGND
U3C
LM339
14
12
9
Q4
2N7000
1
2
HMUTE
PGND
C6
3.3uF
VCOMP
3
R14
50k
11
+
B
10
4
R18
10k
-
6
PGND
7
5
8
R11
100K
FBKGND2
+
C9
0.1uF
B
12
PGND
U1B
LM358
R10
50k
U3D
LM339
13
VCOMP
PGND
A
A
Title
OFFSET CORRECTION & RELAY CIRCUIT
Size
B
Date:
5
4
3
2
Document Number
Rev
4.0
SCHEMATIC 2
Friday, March 01, 2002
Sheet
2
1
of
2