Datenblatt-Suchmaschine für elektronische Bauteile |
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TP2050 Datenblatt(PDF) 11 Page - Tripath Technology Inc. |
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TP2050 Datenblatt(HTML) 11 Page - Tripath Technology Inc. |
11 / 13 page Tri p ath Techn o l o g y, I n c. - T echn i cal I n fo rmation 11 TP2050– KL/1.0/07.05 Outp ut F i l t er Design Tripath amplifiers generally have a higher switching frequency than PWM implementations, allowing the use of higher cutoff frequency filters and reducing the load dependent peaking/drooping in the 20kHz audio band. This is especially important for applications where the end customer may attach any speaker to the amplifier (as opposed to a system where speakers are shipped with the amplifier), since speakers are not purely resistive loads and the impedance they present changes over frequency and from speaker model to speaker model. An RC network, or “Zobel” (RZ, CZ) should be placed at the filter output to control the impedance “seen” by the TP2050 when not attached to a speaker load. The TP2050 works well with a 2 nd order, 80kHz LC filter with L O = 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 TP2050 distortion levels, efficiency, power dissipation and EMI output. Please contact Tripath Applications for additional information about recommended inductor sources. Prote c t ion Circ uits The TP2050 is protected against over-current, over / under-voltage and over-temperature conditions. O v e r -te mp eratu r e Pr o t ectio n An over-temperature fault occurs if the junction temperature of the part exceeds approximately 150 °C. The thermal hysteresis of the part is approximately 25°C, therefore the fault will automatically clear when the junction temperature drops below 125 °C. Perfo r m a n ce Mea s u r emen ts o f th e T K 205 0 The TP2050 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 TP2050 amplifier switching pattern will degrade the measurement. One feature of the TP2050 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 TP2050 Evaluation Board uses the Application/Test Circuit of this data sheet, which has a simple two-pole output filter and excellent performance in listening tests. Measurements in this data sheet were taken using this same circuit with a limited bandwidth setting in the measurement instrument. |
Ähnliche Teilenummer - TP2050 |
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Ähnliche Beschreibung - TP2050 |
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