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TDA8933T Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA8933T Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 47 page  TDA8933_1 © NXP B.V. 2007. All rights reserved. Preliminary data sheet Rev. 01 — 15 May 2007 11 of 47 NXP Semiconductors TDA8933 Class-D audio amplifier If the supply voltage exceeds 36 V, the 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 TDA8933. Two conditions should be distinguished: • If the supply voltage is pumped to higher values by the TDA8933 application itself (see also Section 14.8), the OVP is triggered and the TDA8933 is shut down. The supply voltage will decrease and the TDA8933 is protected against any overstress. • If a supply voltage > 40 V is caused by other or external causes, the TDA8933 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 clamp. An additional 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 protections and the effect on the output signal. Table 6. Overview of protections for the TDA8933 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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