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FDS4953 датащи(PDF) 9 Page - Microsemi Corporation |
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FDS4953 датащи(HTML) 9 Page - Microsemi Corporation |
9 / 18 page LXE1710 EVALUATION BOARD USER GUIDE Microsemi Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 Copyright © 2000 Rev. 1.1, 2000-12-01 APPLICATION INFORMATION ! &' ( LX1710 Filter Implementation, 1-stage vs. 2- stage 0.001 100 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 20 50 0.55626 0.12572 50m 30 100m 200m 500m 1 2 5 10 2025.04 1.15 Watts(W) 2-Stage 1-Stage FILTER DESIGN TRADEOFFS (1-STAGE VS. 2-STAGE) A 1-stage or 2-stage filter may be used depending on your application and performance targets. The main tradeoff in this selection is price (number of components, component costs, PCB area) vs. performance. The primary advantage of the single stage filter is lower cost whereas the main benefit to a 2-stage filter is that it will provide steeper attenuation. This allows the corner frequency to be selected further outside of the audio band (to minimize the effects of impedance variations in the passband) and still provide adequate RF attenuation. Single Stage Filter Advantages • Low Cost: The 1-stage LC filter uses one half the number of inductors/capacitors resulting in a substantial cost savings over a 2-stage design. Key parameters such as THD+N, frequency response, and nose performance do not change significantly. • Power Loss: Since current will flow in two inductors and not four, the inductor power loss will be less in the single stage design. The overall amplifier will have a wider dynamic range and improved efficiency. • Filter Design: This easy-to-design filter can limit audio signal changes within +/- 3dB across the audio band with impedance vari " ) *+ ,! a steeper rolloff with the 2-stage filter, impedance changes could result in a +/- 6dB change. • THD: There are minimal differences between the 1-stage and 2-stage implementations with other parameters such as THD+N as seen in the above graph. Single Stage Filter Disadvantages • EMI and Switching Frequency: For the 1- stage, the switching frequency must be higher than 400kHz to ensure the corner frequency will provide adequate amplifier performance in the high end of the audio frequency range. If fS < 400kHz, then fC < fS /10 = 40kHz which is too close to the desired audio band. A higher oscillation frequency could translate into greater MOSFET switching losses, slightly lower efficiency, and increased EMI effects. With a 2-stage 4th order filter, the switching frequency fS can be reduced to 120kHz. If fS = 120kHz, then fC = fS /3 = 40kHz. The lower oscillation frequency could help minimize EMI issues. LC FILTER DESIGN The output filter helps to reconstruct the amplified audio signal and filter out the switching frequency. The design of the filter depends on the type of attenuation and frequency response desired at the output. The output filter designed into the LXE1710 |
Аналогичный номер детали - FDS4953 |
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Аналогичное описание - FDS4953 |
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