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TPA2029D1YZFR Folha de dados(PDF) 11 Page - Texas Instruments |
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TPA2029D1YZFR Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 17 page C I I 1 f = (2 R C ) p ´ ´ I I C 1 C = (2 R f ) p ´ ´ o JA 1 1 θ 105 C/W Derating Factor 0.0095 = = = A J JA DMAX T Max = T Max - θ P = 150 - 105 (0.4) = 108 C ° TPA2029D1 www.ti.com SLOS661A – DECEMBER 2011 – REVISED APRIL 2012 DECOUPLING CAPACITOR (CS) The TPA2029D1 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) 1- μF ceramic capacitor (typically) placed as close as possible to the device PVDD lead works best. Placing this decoupling capacitor close to the TPA2029D1 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 4.7 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. INPUT CAPACITORS (CI) The input capacitors and input resistors form a high-pass filter with the corner frequency, fC, determined in Equation 1. (1) 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. Not using input capacitors can increase output offset. Equation 2 is used to solve for the input coupling capacitance. If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. (2) COMPONENT LOCATION Place all the external components very close to the TPA2029D1. Placing the decoupling capacitor, CS, close to the TPA2029D1 is important for the efficiency of the Class-D amplifier. Any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. EFFICIENCY AND THERMAL INFORMATION The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor for the packages are shown in the dissipation rating table. Converting this to θJA for the WCSP package: (3) Given θJA of 100°C/W, the maximum allowable junction temperature of 150°C, and the maximum internal dissipation of 0.4 W for 3 W output power into 4- Ω load, 5-V supply, from Figure 7, the maximum ambient temperature can be calculated with the following equation. (4) Equation 4 shows that the calculated maximum ambient temperature is 108°C at maximum power dissipation with a 5-V supply and 4- Ω a load. The TPA2029D1 is designed with thermal protection that turns the device off when the junction temperature surpasses 150°C to prevent damage to the IC. Also, using speakers more resistive than 8- Ω dramatically increases the thermal performance by reducing the output current and increasing the efficiency of the amplifier. OPERATION WITH DACS AND CODECS In using Class-D amplifiers with CODECs and DACs, sometimes there is an increase in the output noise floor from the audio amplifier. This occurs when mixing of the output frequencies of the CODEC/DAC mix with the switching frequencies of the audio amplifier input stage. The noise increase can be solved by placing a low-pass filter between the CODEC/DAC and audio amplifier. This filters off the high frequencies that cause the problem and allow proper performance. See the functional block diagram. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPA2029D1 |
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