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TDA8947J Datasheet(PDF) 8 Page - NXP Semiconductors |
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TDA8947J Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 24 page Philips Semiconductors TDA8947J 4-channel audio amplifier Preliminary data Rev. 01 — 06 February 2004 8 of 24 9397 750 10779 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 8.5 Built-in protection circuits The TDA8947J contains two types of detection sensors: one measures local temperatures of the power stages and one measures the global chip temperature. At a local temperature of approximately 185 °C or a global temperature of approximately 150 °C, this detection circuit switches off the power stages for 2 ms. High impedance of the outputs is the result. After this time period the power stages switch on automatically and the detection will take place again; still a too high temperature switches off the power stages immediately. This protects the TDA8947J against shorts to ground, to the supply voltage and across the load, and against too high chip temperatures. The protection will only be activated when necessary, so even during a short-circuit condition, a certain amount of (pulsed) current will still be flowing through the short, just as much as the power stage can handle without exceeding the critical temperature level. 9. Limiting values [1] The amplifier can deliver output power with non clipping output signals into nominal loads as long as the ratings of the IC are not exceeded. 10. Thermal characteristics Table 6: Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Conditions Min Max Unit VCC supply voltage operating −0.3 +26 V no (clipping) signal [1] −0.3 +28 V VI input voltage −0.3 VCC + 0.3 V IORM repetitive peak output current -4 A Tstg storage temperature non-operating −55 +150 °C Tamb ambient temperature −40 +85 °C Ptot total power dissipation - 69 W VCC(sc) supply voltage to guarantee short-circuit protection -24 V Table 7: Thermal characteristics Symbol Parameter Conditions Value Unit Rth(j-a) thermal resistance from junction to ambient in free air 40 K/W Rth(j-c) thermal resistance from junction to case all channels driven 1.3 K/W |
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