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STA530 Folha de dados(PDF) 2 Page - STMicroelectronics |
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STA530 Folha de dados(HTML) 2 Page - STMicroelectronics |
2 / 17 page STA530 2/17 DESCRIPTION (continued) In fact it's permits to build a BASH® architecture amplifier adding only few external components and a variable Buck regulator tracking the audio signal. Notice that normally only one Buck regulator is used to supply a mul- tichannel amplifiers system , therefore most of the functions implemented in the circuit have a summing output pin. 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 circuit contains all the blocks to build a configurable four channel amplifier. The tracking signal for the external Buck regulator is generated from the Absolute Value Block (AVB) that rec- tifies the audio signal. The outputs of these blocks are decoupled by a diode to permit an easy sum of this signal for the multichannel application. The gain of the stage AVB is equal to 70 (+36.9 dB). A sophisticated circuit performs the output transistor power detector that , with the buck regulator, 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 voltage applied to the STBY/MUTE pin forces the two amplifiers in the proper condi- tion to guarantee a silent turn-on and turn-off. ABSOLUTE MAXIMUM RATINGS Notes: 1. VCD- must not be more negative than -Vs THERMAL DATA Symbol Parameter Value Unit +Vs Positive supply voltage referred to pin 14 (GND) 27 V -Vs Negative supply voltage referred to pin 14 (GND) -27 V VCD+ Positive supply voltage tracking rail referred to pin 14 (GND) 20 V VCD- Negative supply voltage referred to -Vs (1) -0.3 V VCD- Negative supply voltage tracking rail referred to pin 14 (GND) -20 V VPWR_Imp1 VPWR_Imp2 VTRK_1 VTRK_2 Pin 11, 10, 9, 8 Negative & Positive maximum voltage referred to GND (pin 14) -25 to +25 V VPWR_Imp 3 VPWR_Imp 4 VTRK_3 VTRK_4 Pin 17, 18, 19, 20 Negative & Positive maximum voltage referred to GND (pin 14) -25 to +25 V ISTBY-max Pin 12 maximum input current (Internal voltage clamp at 5V) 500 µA VSTBY/ MUTE Pin 12 negative maximum voltage referred to GND (pin 14) -0.5 V Symbol Parameter Value Unit Tj Max Junction temperature 150 °C Rth j_case Thermal Resistance Junction to case .............................. ..max 1 °C/W |
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