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TDA8948J データシート(PDF) 6 Page - NXP Semiconductors |
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TDA8948J データシート(HTML) 6 Page - NXP Semiconductors |
6 / 26 page TDA8948J_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 27 February 2008 6 of 26 NXP Semiconductors TDA8948J 4-channel audio amplifier 8.2.1 Output power measurement The output power as a function of the supply voltage is measured on the output pins at THD = 10 %; see Figure 7. The maximum output power is limited by the supply voltage (VCC = 26 V) and the maximum output current (IO = 4 A repetitive peak current). For supply voltages VCC > 22 V, a minimum load is required; see Figure 5: • SE: RL =3 Ω • BTL: RL =6 Ω 8.2.2 Headroom Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom, compared to the average power output, for transferring the loudest parts without distortion. The Average Listening Level (ALL) music power, without any distortion, yields: • SE at Po(SE) =5W, VCC =17V, RL =4 Ω and THD = 0.2 %: (4) • BTL at Po(BTL) =10W, VCC =17V, RL =8 Ω and THD = 0.1 %: (5) The power dissipation can be derived from Figure 8 (SE and BTL) for a headroom of 0 dB and 12 dB, respectively. For heat sink calculation at the average listening level, a power dissipation of 9 W can be used. 8.3 Mode selection The TDA8948J has three functional modes which can be selected by applying the proper DC voltage to pin MODE1. Standby - The current consumption is very low and the outputs are floating. The device is in standby mode when VMODE1 < 0.8 V, or when the MODE1 pin is grounded. In standby mode, the function of pin MODE2 has been disabled. Mute - The amplifier is DC-biased, but not operational (no audio output). This allows the input coupling capacitors to be charged to avoid pop-noise. The device is in mute mode when 4.5V<VMODE1 <(VCC - 3.5 V). Table 4. Power rating as function of headroom Headroom Power output Power dissipation (all channels driven) SE BTL 0dB Po =5W Po =10W P=17 W 12 dB Po(ALL) = 315 mW Po(ALL) = 630 mW P = 9 W P oALL ()SE 510 3 ⋅ 15.85 --------------- 315 mW == P oALL ()BTL 10 10 3 ⋅ 15.85 ------------------ 630 mW == |
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