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STA530 データシート(PDF) 7 Page - STMicroelectronics |
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STA530 データシート(HTML) 7 Page - STMicroelectronics |
7 / 17 page 7/17 STA530 FUNCTIONAL DESCRIPTION The circuit contains all the blocks to build a configurable four channel amplifier. In fact, only driving properly the TRK_2 (and TRK_4) pins, it’s possible to change the chip configuration: – 50 Watt x 4 – 50 Watt x 2 + 100 Watt x1 (TRK_2/Par1&2 or TRK_4/Par3&4 at -Vs) – 100 Watt x 2 (TRK_2/Par1&2 and TRK_4/Par3&4 at -Vs) Each single channel is based on the Output Bridge Power Amplifier, and its protection circuit. Moreover, a sig- nal 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 < 2.5V), and PLAY (Vpin > 4V). In the Standby mode all the circuits involved in the signal path are uninhabited, 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 ABSOLUTE VALUE BLOCK The absolute value block rectifies the signal to extract the control voltage for the external Buck regulator. The output voltage swing is internally limited, the gain is internally fixed to 70. The input impedance of the rectifier is very high , to allow the appropriate filtering of the audio signal before the rectification. 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 Over Current Iout > 4.5A Reducing Buck regulator output voltage. Related to the Buck regulator Related to the Buck regulator Short circuit Iout > 5A 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. > 18W Reducing Buck regulator output voltage. Related to the Buck regulator Related to the Buck regulator Maximum power dissipation at output transistor Pd tr. > 30W Standby Fast Slow, related to Turn_on sequence |
同様の部品番号 - STA530 |
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同様の説明 - STA530 |
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