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FDS4953 датащи(PDF) 4 Page - Microsemi Corporation |
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FDS4953 датащи(HTML) 4 Page - Microsemi Corporation |
4 / 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 4 Copyright © 2000 Rev. 1.1, 2000-12-01 Part Number Product Description LX1710CDB AudioMAX High Fidelity Controller IC VDD = 7V to 15V, Switching Class-D Mono Power Amplifier IC, 28-Pin SSOP Package. LX1711CDB AudioMAX High Power Controller IC VDD = 7V to 25V, Switching Class-D Mono Power Amplifier IC, 28-Pin SSOP Package. LXE1710 LX1710 AudioMAX Evaluation Board Fully Operational Mono Audio Amplifier. LX1710/1711 AUDIOMAX EVALUATION BOARD FEATURES AND CIRCUIT DESCRIPTION • Fully Assembled Mono Evaluation Board with LX1710 Class-D Controller IC • Improved SNR and Noise Floor Performance • Output Power of 25W typical (LX1710, 15VDD, • Output Power of 54W typical (LX1711, 25VDD, • Supports Full Audio Bandwidth • • Terminal Block Connectors for Supply Voltage and Speaker Connection • RCA Plug for Audio Input Signal The AudioMAX Evaluation Amplifier Board allows the user to quickly connect and evaluate the LX1710 Switching Class-D Mono Controller IC. Easy-to- connect terminal blocks and an RCA plug are provided for interfacing to Power, Speaker, and Audio Input connections. The single stage output filter has been configured to drive a 4 audio bandwidth amplification (See Application section LC filter design for component selection, calculations, and suggested inductor and capacitor values for other loads). The LXE1710 Evaluation Board operates from a single supply voltage. The Class-D Amplifier Controller IC requires a minimal number of external components to create a complete amplifier solution. See LXE1710 Evaluation Board Schematic and Bill of Materials for circuit specifics. A Class-D Amplifier is a “switching” amplifier that converts a low-level, analog audio input signal into a high power, pulse-width modulated (PWM) output. The switching frequency (500kHz typical but can be adjusted) is much higher than the audio bandwidth (20Hz to 20kHz), and is easily filtered out with a simple LC filter. The support circuitry can be generally grouped into three areas (input circuit, output power stage, and output filter). INPUT COMPENSATION The first group is the compensation network and control setting components. These resistors and capacitors set up the controller operating frequency, response characteristics, and comparator ramp fundamental to Class-D operation. OUTPUT STAGE The next section is the output stage. The controller IC generates a PWM output by controlling external FETs connected in a full bridge configuration. The full bridge configuration is connected between the single supply voltage (PVDD) and ground (PGND) with the output of the bridge driving the LC filter stage. Because the FETs are either fully “on” or fully “off”, Class-D topology is extremely efficient (up to 85% typical), circuit power dissipation is minimal, and maximum power is delivered to the speaker. The bridge output also drives the RC low pass filter, which provides the feedback for the control loop through the FBK+ and FBK- inputs. FILTER STAGE The single stage, second order LC filter is used to remove the switching frequency. The frequency response and corner frequency can be easily adjusted for optimization of various loads. The LC evaluation board component values have been chosen for a 4 ! " # $ for component selection. |
Аналогичный номер детали - FDS4953 |
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Аналогичное описание - FDS4953 |
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