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TDA1566 Folha de dados(PDF) 11 Page - NXP Semiconductors |
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TDA1566 Folha de dados(HTML) 11 Page - NXP Semiconductors |
11 / 46 page TDA1566_2 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 02 — 20 August 2007 11 of 46 NXP Semiconductors TDA1566 I2C-bus controlled dual channel/single channel amplifier Rtrip1 = 0.1 × (RPROG − 720) Ω Rtrip2 = 1.05 × (RPROG − 450) Ω Rtrip1 and Rtrip2 levels presented refer to the advised value of 1500 Ω. Note that a shorted load will be interpreted as an amplifier load. The result of the DC load detection is stored in DB1[D4] and DB1[D5] for channel 1 and in DB2[D4] and DB2[D5] for channel 2, see Table 12. Note that the DC load bits are only valid if DB3[D3] = 1. The DC load detection valid bit is reset, DB3[D3] = 0, when the DC load detection is started with a not completely discharged SVR capacitor (VSVR > 0.3 V) or when the DC load detection is interrupted by an engine start (VP < 7.5 V typical, see Section 9). 6.2.2 AC load detection The AC load detection is used to detect if AC coupled speakers like tweeters are connected correctly during assembly. The detection starts when IB1[D2] changes from LOW to HIGH. A sine wave of a certain frequency (e.g. 19 kHz) needs to be applied to the inputs of the amplifier. The output voltage over the load impedance will cause an output current in the amplifier. Output currents larger than 1.15 × I ref will set the AC load detection bit and no AC load is detected when the output current is less than 0.85 × I ref, see Figure 8. The reference current Iref is set with an external resistor RPROG (1 %) connected between the PROG pin and GND. The relation between RPROG and Iref is given by: Iref = 390 / RPROG [A] (valid for RPROG between 1.2 kΩ and 4 kΩ). To set the AC load detection bit the peak output current must pass the 1.15 × I ref threshold three times. The three ‘threshold cross’ counter is used to prevent false AC load detection caused by switching the input signal on or off. To reset the slope counter, IB1[D2] needs to be reset. With RPROG = 1500 Ω the current thresholds are set to 200 mA and 320 mA. The levels presented refer to the advised value of 1500 Ω. Table 12. Interpretation of DC load detection bits Open load bits DB1[D4] and DB2[D4] Amplifier load bits DB1[D5] and DB2[D5] DC load valid bit DB3[D3] Description 0 0 1 amplifier load 0 1 1 line driver load 1 don’t care 1 open load Don’t care don’t care 0 invalid DC load detection result Fig 8. AC load detection limits 001aad011 200 mA (peak) 0.78 × Iref 1.22 × Iref 320 mA (peak) no AC load detected AC load detected |
Nº de peça semelhante - TDA1566_15 |
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Descrição semelhante - TDA1566_15 |
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