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TPA6133A2RTJT датащи(PDF) 9 Page - Texas Instruments |
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TPA6133A2RTJT датащи(HTML) 9 Page - Texas Instruments |
9 / 18 page C O + 1 2pR Lfc fc + 1 2pR LCO 1 2 3 4 5 6 7 8 9 10 15 14 13 12 11 20 19 18 17 16 Top View LEFTINM LEFTINP GND RIGHTINP RIGHTINM HPRIGHT VDD GND HPLEFT CPVSS 0.47uF 0.47uF 0.47uF 0.47uF 2.2KQ 1uF 1uF 1uF 1uF TPA6133A2 www.ti.com SLOS821 – JUNE 2013 APPLICATION INFORMATION SIMPLIFIED APPLICATIONS CIRCUIT Headphone Amplifiers Single-supply headphone amplifiers typically require dc-blocking capacitors. The capacitors are required because most headphone amplifiers have a dc bias on the outputs pin. If the dc bias is not removed, the output signal is severely clipped, and large amounts of dc current rush through the headphones, potentially damaging them. The top drawing in Figure 19 illustrates the conventional headphone amplifier connection to the headphone jack and output signal. DC blocking capacitors are often large in value. The headphone speakers (typical resistive values of 16 Ω or 32 Ω) combine with the dc blocking capacitors to form a high-pass filter. Equation 1 shows the relationship between the load impedance (RL), the capacitor (CO), and the cutoff frequency (fC). (1) CO can be determined using Equation 2, where the load impedance and the cutoff frequency are known. (2) If fc is low, the capacitor must then have a large value because the load resistance is small. Large capacitance values require large package sizes. Large package sizes consume PCB area, stand high above the PCB, increase cost of assembly, and can reduce the fidelity of the audio output signal. Copyright © 2013, Texas Instruments Incorporated 9 Product Folder Links: TPA6133A2 |
Аналогичный номер детали - TPA6133A2RTJT |
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Аналогичное описание - TPA6133A2RTJT |
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