Datenblatt-Suchmaschine für elektronische Bauteile |
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TA2021B Datenblatt(PDF) 8 Page - Tripath Technology Inc. |
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TA2021B Datenblatt(HTML) 8 Page - Tripath Technology Inc. |
8 / 12 page Tri p ath T echno l o g y, I n c. - Techn i cal I n f ormati on 8 TA2021B – 3.0/04.03 Application Information Circuit Board Layout The TA2021B is a power amplifier which operates at relatively high switching frequencies. The outputs of the amplifier switch between VDD and PGND at frequencies as high as 1MHz while driving high currents. This high-frequency digital signal is passed through an LC low-pass filter to recover the amplified audio signal. Because the TA2021B drives the inductive LC output filters and speaker load, the amplifier outputs can be pulled above VDD and below PGND by the stored energy in the output inductance. To avoid subjecting the TA2021B to potentially damaging voltage stress, it is critical to have a good printed circuit board layout to minimize parasitic effects caused by excessive trace inductance/capacitance. It is recommended that Tripath’s layout and application circuit be used as closely as possible for all applications and only be deviated from after careful analysis of the effects of any changes. Output Stage layout Considerations and Component Selection Criteria Proper PCB layout and component selection is a major step in designing a reliable TA2021B power amplifier. The supply pins require proper decoupling with correctly chosen components to achieve optimal reliability. The output pins need proper protection to keep the outputs from going below ground and above VDD. The above layout shows component placement and routing for channel 1 (the same design criteria applies to channel 2). This shows that C3, a 0.1uF surface mount 0805 capacitor, should be the first component placed and must decouple VDD1 (pins 29 and 30) directly to PGND1 (pin35). C2, a low ESR, electrolytic capacitor, should also decouple VDD1 directly to PGND1. Both C2 and C3 may decouple VDD1 to a ground plane, but it is critical that the return path to the PGND1 pin of the TA2021B, whether it is a ground plane or a trace, be a short and direct low impedance path. Effectively decoupling VDD will shunt any power supply trace length inductance. The diodes and inductors shown are for channel 1’s outputs. D1, D3, and L2 connect to the OUTP1 pin and D2, D4, and L3 connect to the OUTM1 pin of the TA2021B. Each output must have Schottky or Ultra Fast Recovery diodes placed near the TA2021B, preferably immediately |
Ähnliche Teilenummer - TA2021B |
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Ähnliche Beschreibung - TA2021B |
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