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STA550 데이터시트(PDF) 2 Page - STMicroelectronics |
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STA550 데이터시트(HTML) 2 Page - STMicroelectronics |
2 / 16 page STA550 2/16 DESCRIPTION (continued) Notice that normally only one Digital Converter is needed to supply a stereo or multi-channel amplifier system, therefore most of the functions implemented in the circuit have summing outputs The signal circuits are biased by fixed negative and positive voltages referred to Ground. Instead the final stag- es of the output amplifiers are supplied by two external voltages that are following the audio signal . In this way the headroom for the output transistors is kept at minimum level to obtain a high efficiency power amplifier. The Compressor circuits, one for each channel, performs a particular transfer behavior to avoid the dynamic restriction that an adaptive system like this requires. To have a high flexibility the attack / release time and the threshold levels are externally programmable. The tracking signal for the external digital converter is generated from the Absolute Value block that rectifies the audio signal present at the compressor output. The outputs of these blocks are decoupled by a diode to permit an easy sum of this signal for the multichannel application. The output power bridges have a dedicated input pin to perform an AC decoupling to cancel the compressor output DC offset. The gain of the stage is equal to 4 (+12dB). A sophisticated circuit performs the output transistor pow- er detector that , with the digital converter, reduces the power supply voltage . Moreover, a maximum current output limiting and the over temperature sensor have been added to protect the circuit itself. The external volt- age applied to the STBY/MUTE pin forces the two amplifiers in the proper condition to guarantee a silent turn- on and turn-off. ABSOLUTE MAXIMUM RATINGS Note 1: VCD- must not be more negative than -Vs and VCD+ must not be more positive than +VS Note 2: All pins withstand ±2KV ESD but not pin 11 Symbol Parameter Value Unit +Vs Positive supply voltage referred to pin 13 (GND) 30 V -Vs Negative supply voltage referred to pin 13 (GND) -24 V VCD+ Positive supply voltage tracking rail referred to pin 13 (GND) 22 V VCD+ Positive supply voltage operated to Vs+(1) 0.3 V VCD- Negative supply voltage referred to -Vs (1) -0.3 V VCD- Negative supply voltage tracking rail referred to pin 13 (GND) -22 V VAtt_Rel1 VAtt_Rel2 Pin 3, 25 Negative & Positive maximum voltage referred to GND (pin 13) -0.5 to +20 V VPwr_Imp1 VPwr_Imp2 VTrk_1 VTrk_2 Pin 7, 21, 18, 10 Negative & Positive maximum voltage referred to GND (pin 13) -20 to +20 V VIn_pre1 VIn_pre2 Pin 8, 20 Negative & Positive maximum voltage referred to GND (pin 13) -0.5 to +0.5 V Vthreshold Pin 17 Negative & Positive maximum voltage referred to GND (pin 13) -7 to +0.5 V Istb-max Pin 11 maximum input current (Internal voltage clamp at 5V) 500 µA Vstbymute Pin 11 negative maximum voltage referred to GND (pin 13) -0.5 V IOUT Output Current 7.0 A |
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