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TPA2006D1 Datasheet(PDF) 20 Page - Texas Instruments |
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TPA2006D1 Datasheet(HTML) 20 Page - Texas Instruments |
20 / 32 page fc + 1 2p R I C I Gain + 2 x 150 kW R I V V TPA2006D1 SLOS498B – SEPTEMBER 2006 – REVISED SEPTEMBER 2015 www.ti.com 10.2.2 Detailed Design Procedure 10.2.2.1 Component Selection Figure 35 shows the TPA2006D1 device typical schematic with differential inputs and Figure 38 shows the TPA2006D1 device with differential inputs and input capacitors, and Figure 39 shows the TPA2006D1 device with single-ended inputs. Differential inputs should be used whenever possible because the single-ended inputs are much more susceptible to noise. Table 2. Typical Component Values REF DES VALUE EIA SIZE MANUFACTURER PART NUMBER RI 150 k Ω (±0.5%) 0402 Panasonic ERJ2RHD154V CS 1 μF (+22%, -80%) 0402 Murata GRP155F50J105Z CI (1) 3.3 nF (±10%) 0201 Murata GRP033B10J332K (1) CI is only needed for single-ended input or if VICM is not between 0.5 V and VDD – 0.8 V. CI = 3.3 nF (with RI = 150 kΩ) gives a high-pass corner frequency of 321 Hz. 10.2.2.2 Input Resistors (RI) The input resistors (RI) set the gain of the amplifier according to Equation 20. (20) Resistor matching is important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays with 1% matching can be used with a tolerance greater than 1%. Place the input resistors close to the TPA2006D1 device to limit noise injection on the high-impedance nodes. For optimal performance the gain must be set to 2 V/V or lower. Lower gain allows the TPA2006D1 device to operate at its best and keeps a high voltage at the input making the inputs less susceptible to noise. 10.2.2.3 Decoupling Capacitor (CS) The TPA2006D1 device is a high-performance class-D audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1 μF, placed as close as possible to the device VDD lead works best. Placing this decoupling capacitor close to the device is important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise signals, a 10- μF or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high PSRR of this device. 10.2.2.4 Input Capacitors (CI) The TPA2006D1 device does not require input coupling capacitors if the design uses a differential source that is biased from 0.5 V to VDD – 0.8 V (shown in Figure 35). If the input signal is not biased within the recommended common-mode input range, if needing to use the input as a high pass filter (shown in Figure 38), or if using a single-ended source (shown in Figure 39), input coupling capacitors are required. The input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in Equation 21. (21) The value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. 20 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: TPA2006D1 |
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