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TDA8511J Folha de dados(PDF) 5 Page - NXP Semiconductors |
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TDA8511J Folha de dados(HTML) 5 Page - NXP Semiconductors |
5 / 16 page 2000 Mar 10 5 Philips Semiconductors Preliminary specification 4 × 13 W single-ended power amplifiers TDA8511J SHORT-CIRCUIT PROTECTION When a short-circuit occurs at one or more outputs to ground or to the supply voltage, the output stages are switched off until the short-circuit is removed and the device is switched on again, with a delay of approximately 20 ms, after removal of the short-circuit. During this short-circuit condition, pin 16 is continuously LOW. When a short-circuit across the load of one or more channels occurs the output stages are switched off during approximately 20 ms. After that time it is checked during approximately 50 µs to see whether the short-circuit is still present. Due to this duty cycle of 50 µs/20 ms the average current consumption during this short-circuit condition is very low (approximately 40 mA). During this short-circuit condition, pin 16 is LOW for 20 ms and HIGH for 50 µs (see Fig.4). The power dissipation in any short-circuit condition is very low. TEMPERATURE DETECTION When the virtual junction temperature Tvj reaches 150 °C, pin 16 will be active LOW. OPEN COLLECTOR OUTPUT Pin 16 is an open collector output, which allows that more devices can be connected together (pins 16). Fig.3 Distortion detector waveform. handbook, halfpage 0 VP VO t 0 MGA706 V16 Fig.4 Short-circuit waveform. handbook, full pagewidth MGL508 short-circuit over the load 20 ms 50 µs t t VP current in output stage V16 |
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