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TDA8947J датащи(PDF) 5 Page - NXP Semiconductors |
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TDA8947J датащи(HTML) 5 Page - NXP Semiconductors |
5 / 24 page Philips Semiconductors TDA8947J 4-channel audio amplifier Preliminary data Rev. 01 — 06 February 2004 5 of 24 9397 750 10779 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 8. Functional description 8.1 Input configuration The input cut-off frequency is: (1) For SE application Ri = 60 kΩ and Ci = 220 nF: (2) For BTL application Ri = 30 kΩ and Ci = 470 nF: (3) As shown in Equation 2 and Equation 3, large capacitor values for the inputs are not necessary, so the switch-on delay during charging of the input capacitors can be minimized. This results in a good low frequency response and good switch-on behavior. 8.2 Power amplifier The power amplifier is a BTL and/or SE amplifier with an all-NPN output stage, capable of delivering a peak output current of 4 A. Using the TDA8947J as a BTL amplifier offers the following advantages: • Low peak value of the supply current • Ripple frequency on the supply voltage is twice the signal frequency • No expensive DC-blocking capacitor • Good low frequency performance. CIV 13 common input voltage decoupling OUT3 − 14 inverted loudspeaker output of channel 3 GND2 15 ground of channels 3 and 4 VCC2 16 supply voltage channels 3 and 4 OUT4+ 17 non inverted loudspeaker output of channel 4 TAB - back side tab or heats spreader has to be connected to ground Table 3: Pin description…continued Symbol Pin Description f i cut off – () 1 2 π R i C i × () ----------------------------- = f i cut off – () 1 2 π 60 10 3 220 10 9 – × × × () ----------------------------------------------------------------- 12 Hz == f i cut off – () 1 2 π 30 10 3 470 10 9 – × × × () ----------------------------------------------------------------- 11 Hz == |
Аналогичный номер детали - TDA8947J |
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Аналогичное описание - TDA8947J |
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