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TDA8946 Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA8946 Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 23 page Philips Semiconductors TDA8946J 2 x 15 W stereo BTL audio amplifier Product specification Rev. 02 — 14 March 2000 5 of 23 9397 750 06863 © Philips Electronics N.V. 2000. All rights reserved. 8.2 Power amplifier The power amplifier is a Bridge Tied Load (BTL) amplifier with an all-NPN output stage, capable of delivering a peak output current of 2 A. The BTL principle offers the following advantages: • Lower peak value of the supply current • The ripple frequency on the supply voltage is twice the signal frequency • No expensive DC-blocking capacitor • Good low frequency performance. 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 8. The maximum output power is limited by the maximum supply voltage of 18 V and the maximum available output current: 2 A repetitive peak current. 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. At VCC =18V, RL =8 Ω and Po = 10 W at THD = 0.1% (see Figure 6), the Average Listening Level (ALL) – music power – without any distortion yields: Po(ALL) = 10 W/15.85 = 631 mW. The power dissipation can be derived from Figure 11 on page 11 for 0 dB respectively 12 dB headroom. For the average listening level a power dissipation of 8 W can be used for a heatsink calculation. 8.3 Mode selection The TDA8946J has three functional modes, which can be selected by applying the proper DC voltage to pin MODE. See Figure 4 and 5 for the respective DC levels, which depend on the supply voltage level. The MODE pin can be driven by a 3-state logic output stage: e.g. a microcontroller with additional components for DC-level shifting. Standby — In this mode the current consumption is very low and the outputs are floating. The device is in standby mode when (VCC − 0.5 V) < VMODE <VCC, or when the MODE pin is left floating (high impedance). The power consumption of the TDA8946J will be reduced to <0.18 mW. Table 4: Power rating as function of headroom Headroom Power output (THD = 0.1%) Power dissipation (P) 0dB Po =10W 18 W 12 dB Po(ALL) = 631 mW 8 W |
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