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Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
EB-TA1101B Class-T Digital Audio Amplifier Evaluation Board using Digital Power Processing T M Technology
Technical Information Revision E - February 2001
GENERAL DESCRIPTION The EB-TA1101B evaluation board is based on the TA1101B, digital audio power amplifier from Tripath Technology. The board is designed to provide a simple and straightforward environment for the evaluation of the Tripath TA1101B. The board can be connected to a +12V supply using cables with banana connectors. Audio inputs are standard RCA jacks. The TA1101B provides amplification for two channels of audio. Signal outputs are on four banana connectors to which any 4 or 8 passive speaker may be connected.
Features
Class-T architecture Proprietary Digital Power Processing TM Technology Requires single +12V power source Output Power (per channel @ VS = 12V): 15W - 4 @ 10% THD+N 10W - 4 @ 0.1% THD+N Easy engineering evaluation platform for Tripath Technology's TA1101B product "Audiophile performance" typically: 0.04% THD+N, 9Wrms @ 4 0.18% IHF-IM, 1Wrms @ 4
Efficiency - >85% @ full power (RL = 8) No heat sink required up to 10W per channel Mute input Turn-on & turn-off pop suppression Intelligent short-circuit protection Intelligent over-temperature protection Connects to any passive 4/8 speakers Takes standard audio line output from any sound system 2-layer low cost board 30-pin Power SOP package
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Introduction
The EB-TA1101B was designed to provide the designer with a simple means of evaluating the performance and functionality of the TA1101B 2x10W amplifier IC from Tripath Technology. The EB-TA1101B is very simple to operate and requires only a few things to get up and running: Stereo signal source 12V power supply (not to exceed 13.2V) Two loads (4-Ohm minimum) For more information on the TA1101B, please refer to the TA1101B datasheet (www.tripath.com).
Power In +12V(red), Gnd(blk)
In1
Inputs
In2
Output 1 Out1+(wht), Out1-(blu)
Outputs
Mute
Sleep
Output 2 Out2+(wht), Out2-(blu)
EB-TA1101B Board
Connection and Operation
Figure 1 shows the connections required for proper operation of the EB-TA1101B.
Input Connection
Audio input to the board is provided via two RCA female connectors. Connector Name IN1 IN2 Channel Channel 1 Input Channel 2 Input
Power Connection
The TA1101B requires a +12V power supply (13.2V max) to operate. Power to the board is provided via the red and black female banana connectors. The positive 12V from the power supply connects to the red banana connector labeled 12V+. The ground connection of power supply attaches to the black banana connector labeled GND.
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+12V
In1 TA1101B
Gnd Out1+ Out1Out2-
+
Audio Source
Gnd
In2 Mute
+
R
Sleep
Out2+
Figure 1
Connector Label 12V+ GND
Description Positive of the 12V Power supply Negative (GND) of 12V Power Supply
Color Red Black
Warning: Do not exceed Maximum Operating Supply Voltage of 13.2V
Output Connection
There are four female banana connectors on the evaluation board for speaker output. The TA1101B has differential outputs (bridged) so it requires two wires per channel to connect to each speaker. Connector Label Out1+ Out1Out2+ Out2Description Positive output of Channel 1 Negative output of Channel 1 Positive output of Channel 2 Negative output of Channel 2 Color White Blue White Blue
Jumper Settings
There are two jumpers on the EB-TA1101B board, which should both be connected (shorted) for normal operation. Jumper, J1 connects the FAULT output to the MUTE pin, allowing the part to Mute itself when a Fault condition (over-current, etc.) is detected. Jumper, J2 connects the SLEEP pin to GND, effectively disabling SLEEP for normal operation. If J2 is removed, the part will go into SLEEP mode. Jumper J1 J2 Purpose Connects FAULT to MUTE Connects SLEEP to GND
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Speaker Right
Speaker Left
L
12V+
-+
Tr i path Technol ogy, I nc. - Techni cal I nfor m ati on
Gain Settings
The TA1101B amplifier gain can be adjusted by modifying external resister values. R2 and R5 are used to set the gain for Channel 1, while R4 and R6 set the gain for Channel 2. The equation for the gain setting is:
R A V = 12 f R i
Where,
R371 For channel 1: A V _ Ch1 = 12 R370 R372 For channel 2: A V _ Ch2 = 12 R373
For a more detailed description, please refer to the TA1101B data sheet.
Performing Measurements on the EB-TA1101B
The TA1101B 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 TA1101B amplifier switching pattern will degrade the measurement. One feature of the TA1101B 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 EBTA1101B Evaluation Board has a simple two-pole output filter with excellent performance in listening tests.
(See Application Note 4 for more information on bench testing with Tripath Class-T amplifiers)
EMI and Shielding
The TA1101B evaluation board has perforated holes around the amplifier and associated circuitry so that an EMI shield can be soldered directly to the board. Due to the spread-spectrum nature of the Class-T amplifier (the energy is spread across a wider spectrum, instead of being concentrated at a single frequency), we have found that specific EMI shielding is typically not necessary for most applications where the amplifier board is mounted inside a chassis. However, a shield perimeter is still provided for use in more sensitive applications.
(See Application Note 11 for more information on EMI)
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CONTACT INFORMATION
World Wide Sales Offices
United States & Europe SE Asia & China Japan & Korea Jim Hauer Eugene Hsu Osamu Ito jhauer@tripath.com ehsu@tripath.com ito@tripath.com 408.567.3089 886.2.2653.7428 81.42.334.2433
TRIPATH TECHNOLOGY, INC
3900 Freedom Circle Santa Clara CA 95054 408.567.3000 www.tripath.com
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1
VDD +12V_PLANE
L5
FBM2125
12V+ BN1
12V+
C21 1000pF
GND BN2
GND
L8 RCA L1 FBM2125 C16 0.1uF C17 1uF 1 2 3 R7 8.2K, 1% 4 5 6 OVERLOADB 20k C14
A
10uH, 2A BN3
U1 C27 0.47uF C12 0.47uF C29 0.1uF C10 1000pF C8 1000pF
OUT1+
IN1
J3
C23 100pF
DCAP2 DCAP1 V5D AGND1 REF
TA1101B
+5GEN CPUMP PGND1 VDDA NC
30 29 28 27 26 C5 1uF
VDD
VDD C18 + C7 0.1uF
D5 MBRS130T3
L6
10uH, 2A
R9 10, 1/4W
BN4 VDD C28 0.47uF D6 MBRS130T3 D7 MBRS130T3
OUT1-
OVERLOADB AGND2 V5A VP1 IN1 MUTE VP2
COPPER AREA*
OUTP1 VDD1 OUTM1 OUTM2 VDD2 OUTP2 DGND
25 24 23 22 21 20 19 18 17 16
7 8 9
180uF,25V
2.2uF +
20k R2
R5 20k R6
VDD + C6 0.1uF C19 180uF,25V
10 11 12 13 14
A
RCA
C24 100pF
BIASCAP AGND3
HEATSLUG*
J4
C15
2.2uF
R4 C26 0.1uF
*
IN2
L2
FBM2125 +
20k
IN2
PGND2 FAULT SLEEP
15
D8 MBRS130T3 L7 VDD 10uH, 2A C9 C25 0.47uF C13 0.47uF C30 0.1uF 1000pF BN5
31
OUT2-
J1 MUTE FAULT
JUMPER SLEEP
R1 1Meg
JUMPER
GND
NOTES:
1. TA1101B inputs have a DC bias of 2.5V. If input preamp circuitry is NOT biased at 0V, C14 and C15 may need to be reversed. 2. The MUTE function can be optionally tied to the FAULT pin to allow for an automatic reset in the event of an over current FAULT.
J2
C20 0.1uF
L9
10uH, 2A
R10 10, 1/4W
C11 1000pF
BN6 C22 0.47uF
OUT2+
3 sq. in. of 1oz. copper directly under TA1101B on solder side of PC board with a 5 x 16 array of 14mil vias.
*
Tripath Technology, Inc.
Title Size B Date:
1
TA1101B Evaluation Board
Document Number Monday, February 12, 2001 Sheet 1 of 1 Rev E
http://www.tripath.com
EB-TA1101B Revision: E Bill Of Materials
Quantity
Reference
Value
Description
Mfgr/Part#
COMMENT
2 1 4 1
R10,R9 R7 R2, R4, R5, R6 R1
10, 1/4W 8.2K, 1% 20k 1Meg
Resistor Resistor Resistor Resistor
Zobel resistor
Feedback resistor
7 6 5 2 2 2 2
C6,C7,C16,C20,C26, C29, C30 C12, C13, C22,C25,C27,C28 C8,C9,C10,C11,C21 C23,C24 C18,C19 C17,C5 C15,C14
0.1uF 0.47uF 1000pF 100pF 180uF,25V 1uF 2.2uF
Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Input coupling cap Panasonic HFQ Low ESR, high temp aluminum elect. main output filter cap
4
L6,L7,L8,L9
10uH, 2A
Inductor
ISI RL622
or TOKO 8RDY
Output series inductor.
3
L1,L2,L5
FBM2125
Ferrite bead
Taiyo-yuden
FBMJ2125 HM330-T
Ferrite bead, 33ohms (100MHz)
4 1
D5,D6,D7,D8 U1
MBRS130T3 TA1101B
Diode IC
On Semi Tripath
MBRS130T3 TA1101B
Output protection diode
6 2 2
BN1, BN2, BN3, BN4, BN5, BN6 J3, J4 J1, J2
Connector Connector Header
Johnson Components
101-09XX-001
PCB mount female banana RCA input jack Header, 2-pin 0.1"

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