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TPA2005D1DRBRG4 Datasheet(PDF) 13 Page - Texas Instruments |
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TPA2005D1DRBRG4 Datasheet(HTML) 13 Page - Texas Instruments |
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13 / 42 page  T A Max + TJMax * qJAPDmax + 150 * 62.5 (0.2) + 137.5°C q JA + 1 Derating Factor + 1 0.016 + 62.5 °C W TPA2005D1 www.ti.com SLOS369G – JULY 2002 – REVISED OCTOBER 2015 Feature Description (continued) 9.3.1.1 Advantages of Fully Differential Amplifiers • Input-coupling capacitors not required: – The fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. For example, if a codec has a midsupply lower than the midsupply of the TPA2005D1, the common-mode feedback circuit will adjust, and the TPA2005D1 outputs will still be biased at midsupply of the TPA2005D1. The inputs of the TPA2005D1 can be biased from 0.5 V to VDD - 0.8 V. If the inputs are biased outside of that range, input-coupling capacitors are required. • Midsupply bypass capacitor, C(BYPASS), not required: – The fully differential amplifier does not require a bypass capacitor. This is because any shift in the midsupply affects both positive and negative channels equally and cancels at the differential output. • Better RF-immunity: – GSM handsets save power by turning on and shutting off the RF transmitter at a rate of 217 Hz. The transmitted signal is picked-up on input and output traces. The fully differential amplifier cancels the signal much better than the typical audio amplifier. 9.3.2 Efficiency and Thermal Information The maximum ambient temperature depends on the heat-sinking ability of the PCB system. The derating factor for the 2,5-mm x 2,5-mm MicroStar Junior package is shown in the dissipation rating table. Converting this to θJA: (1) Given θJA of 62.5°C/W, the maximum allowable junction temperature of 150°C, and the maximum internal dissipation of 0.2 W (worst case 5-V supply), the maximum ambient temperature can be calculated with equation Equation 2. (2) Equation Equation 2 shows that the calculated maximum ambient temperature is 137.5°C at maximum power dissipation with a 5-V supply; however, the maximum ambient temperature of the package is limited to 85°C. Because of the efficiency of the TPA2005D1, it can be operated under all conditions to an ambient temperature of 85°C. The TPA2005D1 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. 9.3.3 Eliminating the Output Filter with the TPA2005D1 This section focuses on why the user can eliminate the output filter with the TPA2005D1. 9.3.3.1 Effect on Audio The class-D amplifier outputs a pulse-width modulated (PWM) square wave, which is the sum of the switching waveform and the amplified input audio signal. The human ear acts as a band-pass filter such that only the frequencies between approximately 20 Hz and 20 kHz are passed. The switching frequency components are much greater than 20 kHz, so the only signal heard is the amplified input audio signal. 9.3.3.2 Traditional Class-D Modulation Scheme The traditional class-D modulation scheme, which is used in the TPA005Dxx family, has a differential output where each output is 180 degrees out of phase and changes from ground to the supply voltage, VDD. Therefore, the differential pre-filtered output varies between positive and negative VDD, where filtered 50% duty cycle yields 0 volts across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown in Figure 33. Note that even at an average of 0 volts across the load (50% duty cycle), the current to the load is high causing a high loss and thus causing a high supply current. Copyright © 2002–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: TPA2005D1 |
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