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TDF8541TH/N2 数据表(PDF) 18 Page - NXP Semiconductors |
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TDF8541TH/N2 数据表(HTML) 18 Page - NXP Semiconductors |
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18 / 54 page  TDF8541 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 3 — 13 December 2011 18 of 54 NXP Semiconductors TDF8541 I2C-bus controlled 4 45 W power amplifier 7.5.3 AC load detection The AC load detection, set with IB1[D2] = 1, is used to detect if AC-coupled speakers such as tweeters are connected correctly. The detection requires a 19 kHz sine wave to be applied to the inputs of the amplifier. A high current AC-load detection mode can be selected, for example during car assembly, or a low current AC-load detection mode, for example during switch on of car radio. The output voltage over the load impedance generates an amplifier current. If the amplifier peak current triggers 4 times a 500 mA (peak) threshold (or 275 mA (peak) in low current mode), the AC-load detection bit is set. The 4 ‘threshold cross’ counter is used to prevent false AC-load detection caused by switching the input signal on or off. An AC-coupled speaker reduces the impedance at the output of the amplifier in a certain frequency band. The presence of an AC-coupled speaker can be determined using a high current mode (IB4[D1] = 1, see Figure 14) or using a low current detection mode (IB4[D1] = 0; see Figure 14. If, for instance, a 19 kHz input signal is generated with a peak output voltage of 2 V the I2C-bus bits are guaranteed to be set with a total AC + DC load less than 4 and are guaranteed not set with a load of more than 9 ; see Figure 14. The interpretation of the line driver and amplifier mode DC load bit for AC load detection is shown in Table 6. Fig 13. Offset detection 001aam700 reset, setting disabled offset threshold time Vo = (OUT+ - OUT-) offset threshold time read → set bit 1 second: read → offset, DBx[D2] set 1 second: read → no offset, DBx[D2] reset Vo = (OUT+ - OUT-) |
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