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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TDA8932BT Fiches technique(PDF) 10 Page - NXP Semiconductors |
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TDA8932BT Fiches technique(HTML) 10 Page - NXP Semiconductors |
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10 / 48 page  TDA8932B_4 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 04 — 18 December 2008 10 of 48 NXP Semiconductors TDA8932B Class-D audio amplifier • 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 window protection will be activated. As a result the amplifier will not start until the short-circuit to the supply lines is removed. 8.4.5 Supply voltage protection If the supply voltage drops below 10 V, the UnderVoltage Protection (UVP) circuit is activated and the system will shut down directly. 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 36 V the OverVoltage Protection (OVP) circuit is activated and the power stages will shut down. It is re-enabled as soon as the supply voltage drops below the threshold level. The system is restarted again after 100 ms. It should be noted that supply voltages > 40 V may damage the TDA8932B. Two conditions should be distinguished: 1. If the supply voltage is pumped to higher values by the TDA8932B application itself (see also Section 14.3), the OVP is triggered and the TDA8932B is shut down. The supply voltage will decrease and the TDA8932B is protected against any overstress. 2. If a supply voltage > 40 V is caused by other or external causes, then the TDA8932B will shut down, but the device can still be damaged since the supply voltage will remain > 40 V in this case. The OVP protection is not a supply voltage clamp. An additional UnBalance Protection (UBP) circuit compares the positive analog supply voltage (VDDA) and the negative analog supply voltage (VSSA) and is triggered if the voltage difference between them exceeds a certain level. This level depends on the sum of both supply voltages. The unbalance threshold levels can be defined as follows: • LOW-level threshold: VP(th)(ubp)l < 8⁄5 × VHVPREF • HIGH-level threshold: VP(th)(ubp)h > 8⁄3 × VHVPREF In a symmetrical supply the UBP is released when the unbalance of the supply voltage is within 6 % of its starting value. Table 6 shows an overview of all protection and the effect on the output signal. Table 6. Protection overview Protection Restart When fault is removed Every 100 ms OTP no yes OCP yes no WP yes no UVP no yes OVP no yes UBP no yes |
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