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| TI TPA2013D1 D类放大器应用方案 | |||||
作者：TI 方案来源：TI 点击数： 更新时间：2007-12-27  |
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The TPA2013D1 is a high efficiency Class-D audio power amplifier with an integrated boost converter. It drives up to 2.7 W (10% THD+N) into a 4 ohm speaker. With 85% typical efficiency, the TPA2013D1 helps extend battery life when playing audio. The built-in boost converter generates the voltage rail for the Class-D amplifier. This provides a louder audio output than a stand-alone amplifier connected directly to the battery. It also maintains a consistent loudness, regardless of battery voltage. Additionally, the boost converter can be used to supply external devices. The TPA2013D1 has an integrated low pass filter to improve RF rejection and reduce out-of-band noise, increasing the signal to noise ratio (SNR). A built-in PLL synchronizes the boost converter and Class-D switching frequencies, thus eliminating beat frequencies and improving audio quality. All outputs are fully protected against shorts to ground, power supply, and output-to-output shorts. 主要特性: High Efficiency Integrated Boost Converter (Over 90% Efficiency) 2.2-W into an 8-ohm Load from a 3.6-V Supply 2.7-W into an 4-ohm Load from a 3.6-V Supply Operates from 1.8 V to 5.5 V Efficient Class-D Prolongs Battery Life Independent Shutdown for Boost Converter and Class-D Amplifier Differential Inputs Reduce RF Common Noise Built-in INPUT Low Pass Filter Decreases RF and Out of Band Noise Sensitivity Synchronized Boost and Class-D Eliminates Beat Frequencies Thermal and Short-Circuit Protection Available in 2.275 mm x 2.275 mm 16-ball WCSP and 4 mm x 4 mm 20-Lead QFN Packages 3 Selectable Gain Settings of 2 V/V, 6 V/V, and 10 V/V APPLICATIONS Cell Phones PDA GPS Portable Electronics  图1.器件的功能方框图  图2.TPA2013D1和TPA2032D1组成立体声放大器电路 Use the boost converter of the TPA2013D1 as a power supply for the flash LED of a digital still camera. Use a microprocessor or other device or synchronize the flash to shutter sound that typically comes from the speaker of a digital still camera. Figure 33 shows a typical circuit for this application. LEDs, switches, and other components will vary by application.  图3. 数码相机的LED驱动器 Bypass the boost converter to drive the Class-D amplifier directly from the battery. Place a Shottky diode between the SW pin and the VCCIN pin. Select a diode that has an average forward current rating of at least 1A, reverse breakdown voltage of 10 V or greater, and a forward voltage as small as possible. See Figure 34 for an example of a circuit designed to bypass the boost converter. Do not configure the circuit to bypass the boost converter if VDD is higher than VCC when the boost converter is enabled (SDb ≥ 1.3 V); VDD must be lower than VCC for proper operation. VDD may be set to any voltage within the recommended operating range when the boost converter is disabled (SDb ≤ 0.3V). Place a logic high on SDb to place the TPA2013D1 in boost mode. Place a logic low on SDb to place the TPA2013D1 in bypass mode.  图4.旁路电路 TPA2013D1EVM Schematic  图5. 评估板TPA2013D1EVM 电路图 下表是TPA2013D1EVM的元件列表:  详情请见: http://focus.ti.com/lit/ds/symlink/tpa2013d1.pdf |
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