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STA5100 数据表(PDF) 7 Page - STMicroelectronics |
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STA5100 数据表(HTML) 7 Page - STMicroelectronics |
7 / 14 page 7/14 STA5100 FUNCTIONAL DESCRIPTION The circuit contains all the blocks to build a mono amplifier. It is based on the Output Bridge Power Amplifier, and its protection circuit. Moreover, the compression function and a signal rectifier are added to complete the circuit. The operation modes are driven by The Turn-on/off sequence block. In fact the IC can be set in three states by the Stby/mute pin: Standby ( Vpin < 0.8V), Mute (1.6V < Vpin < 3V), and Play (Vpin > 4V). In the Standby mode all the circuits involved in the signal path are in off condition, instead in Mute mode the circuits are biased but the Speakers Outputs are forced to ground potential. These voltages can be get by the external RC network connected to Stby/Mute pin. The same block is used to force quickly the I.C. In standby mode or in mute mode when the I.C. dangerous condition has been detected. The RC network in these cases is used to delay the Normal operation restore. The protection of the I.C. are implemented by the Over Temperature, Unbalance Ground, Output Short circuit, Under voltage, and output transistor Power sensing as shown in the following table: Table 1. Protection Implementation See the POWER PROTECTION paragraph for the details Compression An other important function implemented, to avoid high power dissipation and clipping distortion, is the Com- pression of the signal input. In fact the preamplifier stage performs a voltage gain equal to 5, fixed by Ri and Rr external resistor, but in case of high input signal or low power supply voltage, its gain could be reduced of 26dB. This function is obtained with a feedback type compressor that , in practice, reduces the impedance of the ex- ternal feedback network. The behavior of compression it's internally fixed but depends from the Audio input volt- age signal level, and from the Threshold voltage applied to the Threshold pin. The attack and release time are programmable by the external RC network connected to the Att_Rel pins. The constraints of the circuit in the typical application are the following: Vthreshold range = -5 to 0 Vin peak max = 8V Vout peak max = 10V Fault Type Condition Protection strategy Action time Release time Chip Over temperature Tj > 130 °C Mute Fast Slow Related to Turn_on sequence Chip Over temperature Tj > 150 °C Standby Fast Slow, Related to Turn_on sequence Unbalancing Ground |Vgnd| > ((CD+) - (CD-))/2 + 5V Standby Fast Slow, Related to Turn_on sequence Short circuit Iout > 12A Standby Fast Slow, related to Turn_on sequence Under Voltage |Vs+| + |Vs-|< 20V Standby Fast Slow, related to Turn_on sequence Extra power dissipation at output transistor Pd tr. > 50W Reducing DIGITAL CONVERTER output voltage. Related to the DIGITAL CONVERTER Related to the DIGITAL CONVERTER Maximum power dissipation at output transistor Pd tr. > 96W Standby Fast Slow, related to Turn_on sequence |
类似零件编号 - STA5100 |
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类似说明 - STA5100 |
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