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TDA8560 Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA8560 Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 16 page  1996 Jan 08 5 Philips Semiconductors Product specification 2 × 40 W/2 Ω stereo BTL car radio power amplifier with diagnostic facility TDA8560Q 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 12 is continuously low. When a short-circuit across the load of one or both 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 12 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 12 will become continuously low. OPEN COLLECTOR OUTPUT Pin 12 is an open collector output, which allows pin 12 of more devices being tied together. Fig.4 Short-circuit waveform. handbook, full pagewidth MGA722 short-circuit over the load 20 ms µ 50 s t t VP current in output stage V12 |
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