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TDA8950 Folha de dados(PDF) 10 Page - NXP Semiconductors |
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TDA8950 Folha de dados(HTML) 10 Page - NXP Semiconductors |
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10 / 39 page  TDA8950_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 9 September 2008 10 of 39 NXP Semiconductors TDA8950 2 × 150 W class-D power amplifier Should there be an impedance drop (e.g. due to dynamic behavior of the loudspeaker) the same protection will be activated. The maximum output current will again be limited to 9.2 A, but the amplifier will not switch-off completely (thus preventing audio holes from occurring). The result will be a clipping output signal. See Section 13.7 for more information on this maximum output current limiting feature. 8.3.3 Window Protection (WP) The WP checks the conditions at the output terminals of the power stage and is activated: • During the start-up sequence, when pin MODE is switched from standby to mute. In the event of a short-circuit at one of the output terminals to pin VDDPn or pin VSSPn the start-up procedure is interrupted and the TDA8950 waits until the short-circuit to the supply lines has been removed. Because the test is done before enabling the power stages, no large currents will flow in an event of short-circuit. • When the amplifier is completely shut-down due to activation of the OCP because a short-circuit to one of the supply lines is made, then during restart (after 100 ms) the WP will be activated. As a result the amplifier will not start-up until the short-circuit to the supply lines is removed. 8.3.4 Supply voltage protections If the supply voltage drops below minimum supply voltage, the UVP circuit is activated and the system will shutdown correctly. If the internal clock is used, this switch-off will be silent and without pop noise. When the supply voltage rises above the threshold level, the system is restarted again after 100 ms. If the supply voltage exceeds maximum supply voltage, the OVP circuit is activated and the power stages will shutdown. When the supply voltage drops below the threshold level, the system is restarted again after 100 ms. An additional UBP circuit compares the positive analog (voltage on pin VDDA) and the negative analog (voltage on pin VSSA) supply voltage and is triggered if the voltage difference exceeds a factor of two. When the supply voltage difference drops below the threshold level, the system is restarted again after 100 ms. Example: With a symmetrical supply of ±30 V, the protection circuit will be triggered if the unbalance exceeds approximately 15 V. See Section 13.7. In Table 4 an overview is given of all protections and their respective effects on the output signal. |
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