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TDA8589BJ データシート(PDF) 10 Page - NXP Semiconductors |
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TDA8589BJ データシート(HTML) 10 Page - NXP Semiconductors |
10 / 55 page 2004 Feb 24 10 Philips Semiconductors Product speci cation I2C-bus controlled 4 45 Watt power ampli er and multiple voltage regulator TDA8589J; TDA8589xJ 2. After 250 ms the DC load is detected and the mute is released. This is inaudible and can be implemented each time the IC is powered on. 3. When the amplifier start-up cycle is completed (after 1.5 s), apply an AC signal to the input, and DC-load bits D5 of each data byte should be read and stored by the microcontroller. 4. After at least 3 periods of the input signal, the load status can be checked by reading AC-detect bits D4 of each data byte. The AC-load peak current counter can be reset by setting bit D1 of instruction byte IB1 to logic 0 and then to logic 1. Note that this will also reset the DC-load detection bits D5 in each data byte. Low headroom protection The normal DC output voltage of the amplifier is set to half the supply voltage and is related to the voltage on pin SVR. An external capacitor is connected to pin SVR to suppress power supply ripple. If the supply voltage drops (at vehicle engine start), the DC output voltage will follow slowly due to the affect of the SVR capacitor. The headroom voltage is the voltage required for correct operation of the amplifier and is defined as the voltage difference between the level of the DC output voltage before the VP voltage drop and the level of VP after the voltage drop (see Fig.4). At a certain supply voltage drop, the headroom voltage will be insufficient for correct operation of the amplifier. To prevent unwanted audible noises at the output, the headroom protection mode will be activated (see Fig.13). This protection discharges the capacitors connected to pins SVR and ACGND to increase the headroom voltage. V (V) t (sec) SVR voltage vehicle engine start headroom voltage amplifier DC output voltage VP 14 8.4 7 Fig.4 Amplifier output during supply voltage. |
同様の部品番号 - TDA8589BJ |
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同様の説明 - TDA8589BJ |
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