TK2050 Ver la hoja de datos (PDF) - Tripath Technology Inc.
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componentes Descripción
Fabricante
TK2050
Tripath Technology Inc.
TK2050 Datasheet PDF : 19 Pages
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Tripath Technology, Inc. - Technical Information
speaker load. The TK2050 works well with a 2nd order, 80kHz LC filter with LO = 10uH and CO =
0.47uF and RZ = 10 Ohm/1W and CZ = 0.47uF.
NOTE: Output inductor selection is a critical design step. The core material and geometry of the
output filter inductor affects the TK2050 distortion levels, efficiency, power dissipation and EMI output.
Minimum and Maximum Supply Voltage Operating Range
The TK2050 can operate over a wide range of power supply voltages from +12V to +30V. In order to
optimize operation for either the low or high range, the user must select the proper values for RFBB,
and RFBC.
Protection Circuits
The TK2050 is protected against over-current, over / under-voltage and over-temperature conditions.
Over-temperature Protection
An over-temperature fault occurs if the junction temperature of the part exceeds approximately
165°C. The thermal hysteresis of the part is approximately 30°C, therefore the fault will automatically
clear when the junction temperature drops below 135°C.
HMUTE
The HMUTE pin is a 5V logic output that indicates various fault conditions within the device. It is not
normally used in product applications.
OVRLDB
The OVRLDB pin is a 5V logic output that is asserted just at the onset of clipping. When low, it
indicates that the level of the input signal has overloaded the amplifier resulting in increased distortion
at the output. The OVRLDB signal can be used to control a distortion indicator light or LED through a
simple buffer circuit, as the OVRLDB cannot drive an LED directly. There is a 20K resistor on chip in
series with the OVRLDB output.
Performance Measurements of the TK2050
The TK2050 operates by generating a high frequency switching signal based on the audio input. This
signal is sent through a low-pass filter (external to the Tripath amplifier) 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 TK2050 amplifier switching pattern will degrade the
measurement.
One feature of the TK2050 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
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TK2050 – SB/1.0/8-02
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