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Part: EB-TA0102
Category:
Others
Description: Class-t Digital Audio Amplifier Evaluation Board Using Digital Power Processing(tm) Technology
Company: Tripath
Datasheet: Download EB-TA0102 datasheet File size : 219 kB
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TECHNICAL INFORMATION
CLASS-T DIGITAL AUDIO AMPLIFIER EVALUATION BOARD USING EB-TA0102 DIGITAL POWER PROCESSING TM TECHNOLOGY
January 2001, For Rev. 3.3 Board
General Description
The EB-TA0102 evaluation board is based on the TA0102A digital audio power amplifier from Tripath Technology. This board is designed to provide a simple and straightforward environment for the evaluation of the Tripath stereo TA0102A amplifier. This board can also be used in a bridged configuration for high power mono output.
Features
Ø Ø Ø Ø 2 x 150W @ 0.1% THD+N, 4 300W bridgeable subwoofer output, @ 0.1% THD+N, 4 Four N-Channel power MOSFETs Outputs short circuit protected Ø Ø Ø Ø
Quick, easy evaluation and testing of the TA0102A amplifier Ready to use in many applications: 2 channel stereo systems Powered 2.1 speaker systems Powered Subwoofers
Benefits
2
EB-TA0102 01.01, Rev. 3.3
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TECHNICAL INFORMATION
OPERATING INSTRUCTIONS
Power Supply Description
There are three external power supplies required to operate this board: Vspos, Vsneg and +5V (see Figure 1). Vspos and Vsneg power the load and so must each be able to provide half of the desired output power, plus about 20% for overhead and margin. The TA0102A amplifier also requires a supply, VN12, that is 12V more positive than Vsneg and tracks Vneg. This evaluation board generates this VN12 voltage on-board. All input, output and power supply connections are made using tinned wire or female banana connectors (not shown). Though not required, the following powering-up sequence is usually adhered to during bench st nd rd evaluations: 1 ) +5V, 2 ) Vsneg and 3 ) Vspos (refer to the Turn-on/off Pop section). The positive and negative supply voltages do not have to match or track each other, but distortion or clipping levels will be determined by the lowest (absolute) supply voltage. For applications where VN12 is supplied separately, make sure this supply tracks the Vsneg as it becomes more negative with respect to ground. Once power is applied to the evaluation board, the green power light, LED 1, will illuminate. If it does not, power the unit down and recheck all connections and supplies. If the MUTE jumper is missing, the LED will not illuminate. To un-mute, short pins 2 and 3 of JP5. Please note that until the Vspos and Vsneg have powered up and are within the undervoltage and overvoltage limits, the LED will be illuminated (assuming everything else is properly connected). Once the amplifier is switching, if the undervoltage or overvoltage limit is violated, LED 1 will turn off until supply voltages are within specification.
Input Connections
Audio input to the board is located at IN1 and IN2 (see Figures 1 and 2). The input can be a test signal or music source. Connections are made using tinned wired to IN1, IN2 and Analog Ground, AGND. These connections are made on the evaluation board using a cable harness with female banana connectors (not shown).
Output Connections
There are four female banana connectors on the evaluation board for speaker outputs OUT1, OUT2, and Power Grounds, GND1 and GND2 (see Figures 1 and 2; cable harness connections are not shown). The TA0102A can be operated as a two channel single-ended amplifier, bridged mono output amplifier (see Figure 8) or with a passive crossover for a 2.1 channel application (refer to Application Note 13). Outputs can be any passive speaker(s) or test measurement equipment (see Application Note 4 "Parametric Measurements" for more information on bench testing). Note: To avoid performance degradation, the Analog Ground and Power Grounds should be kept separate. They are internally connected in the TA0102A amplifier.
EB-TA0102 01.01, Rev. 3.3
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TECHNICAL INFORMATION
Connector Name IN1 IN2 OUT1 OUT2
Channel Channel 1 Input Channel 2 Input Channel 1 Output Channel 2 Output
Board Operating Conditions
SYMBOL VS V5 PARAMETER Supply Voltage (Vspos & V sneg) Positive 5V Bias Supply MIN. +/-28 4.5 5 TYP. MAX. +/-49 5.5 UNITS V V
See TA0102A data sheet for additional information on Absolute Maximum Ratings, Operating Conditions, Electrical Characteristics and Performance Characteristics.
Turn-on/off Pop
To avoid turn-on pops, bring the mute from a high to a low state after all power supplies have settled. To avoid turn-off pops, bring the mute from a low to a high state before turning off the supplies. The only issue with bringing up the 5V last or turning it off first is clicks/pops. If the mute line is properly toggled (slow turn-on, quick turn-off), then any power up sequence is fine. In practice, the 5V will usually collapse before Vspos and Vsneg. This is acceptable and will not cause any damage to the TA0102A.
EB-TA0102 01.01, Rev. 3.3
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TECHNICAL INFORMATION
EB-TA0102 Board
Output Transistors
Power LED Mute Jumper Input Connections CONNECTIONS Vspos (+V) +5V AGND DGND NC Vsneg (-V)
Voltage Offset Adjust Break Before Make Jumpers
2
Output Connections
Output Transistors
Figure 1
*Please note the Break-Before-Make labels on the PC Board are incorrect and are reversed.
N-Channel MOSFETs, M1-M4
M1
MUTE
M2
MUTE IN2 AGND IN1
LED
+V +5 HEATSINK AG
TA0102A
DG OFFSET CH2 OFFSET CH1 NC + +
BBM0 BBM1
-V OUT1 GND1
M3
Tripath Class-T Audio Amplifier Board EB-TA0102, Rev. 3.3
GND2 OUT2
M4
Figure 2
4
EB-TA0102 01.01, Rev. 3.3
TECHNICAL INFORMATION
ARCHITECTURE
A block diagram of one channel of the evaluation board is shown in Figure 3. blocks of the amplifier are described below. The major functional
In
I n p u t Stage
TA0102A
Output Section
Out
VN12
Figure 3 Input Stage Figure 4 shows one channel of the Input Stage. The TA0102A amplifier is designed to accept unbalanced inputs and provide an overall gain of 7.05, or approximately 17 dB. Please note that the input stage of the TA0102A is biased at approximately 2.5VDC. Therefore, for an input signal centered around ground (0VDC), the polarity of the coupling capacitor, CI N , shown in Figure 4 is correct.
49.9K RIN +5V
1uF, 6.3V + CIN 1M 1M Input to TA0102A
(DC Bias ~2.5V)
10K 0.1uF, 50V
Figure 4
EB-TA0102 01.01, Rev. 3.3
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