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TDA8933BTW Datasheet(PDF) 10 Page - NXP Semiconductors |
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TDA8933BTW Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 42 page  TDA8933B_1 © NXP B.V. 2008. All rights reserved. Preliminary data sheet Rev. 01 — 23 October 2008 10 of 42 NXP Semiconductors TDA8933B 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 enabled again as soon as the supply voltage drops below the threshold level. The power stage is restarted after 100 ms. Supply voltages > 40 V may damage the TDA8933B. Two conditions should be distinguished here: • If the supply voltage is pumped to higher values by the TDA8933B application itself (see also Section 14.8), the OVP is triggered and the TDA8933B is shut down. The supply voltage will decrease and the TDA8933B is thus protected against any overstress. • If a supply voltage > 40 V is caused by other or by external causes the TDA8933B will shut down, but the device can still be damaged since the supply voltage in this case will remain > 40 V. The OVP protection is not a supply clamp. An additional UnBalance Protection (UBP) circuit compares the positive analog supply voltage VDDA with the negative analog supply voltage VSSA and is triggered if the difference between them exceeds a certain level. This level depends on the sum of both supply voltages. The UBP 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 their effect on the output signal. Table 6. Overview of protections for the TDA8933B 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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