EB-TK2051 Ver la hoja de datos (PDF) - Tripath Technology Inc.
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EB-TK2051 Datasheet PDF : 10 Pages
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Tripath Technology, Inc. - Technical Information
INDICATOR LED’S
The EB-TK2051 has three LED’s V5, HMUTE, and TH_WAR. The V5 LED will glow green when the 5V
supply is on. The HMUTE LED will glow red and both outputs are muted when a fault occurs or the MUTE
header is set to V5. Please refer to the TK2051 Data Sheet for a complete description of HMUTE. The
TH_WAR LED glows red when the thermal limit of the TP2051 has been exceeded. Please refer to the
Board Connection Diagram for the LED locations on the EB-TK2051.
OUTPUT OFFSET NULL
There are two potentiometers, R16 (Channel 1) and R24 (Channel 2) that are used to manually trim the
output offset to 0Vdc. Please refer to the Board Connection Diagram for the potentiometer locations on the
EB-TK2051. The Evaluation board is shipped with the offset nulled within +/-10mV.
GAIN SETTING
The gain of the EB-TK2051 Rev 1.3 is set to 15V/V. The gain of the TK2051 is the product of the TC2000
(control stage) gain and the TP2051 (power stage) gain. The control stage gain is set to unity. Before
changing the gain of the EB-TK2051, please refer to the Amplifier Gain section of the EB-TK2051 Data
Sheet.
Performing Measurements on the EB-TK2051 Rev 1.3:
The TK2051 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 TK2051 amplifier switching pattern will degrade the measurement by
including out of band (audio) energy.
One feature of the TK2051 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-TK2051 has a simple two-pole output filter with excellent performance in listening tests.
(See Application Note 4 for additional information on bench testing)
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EB-TK2051 – KL/Rev. 1.0/04.02
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