TDA8933B NXP Semiconductors, TDA8933B Datasheet - Page 10

• Manufacturer Part Number: TDA8933B
• Description: The TDA8933B is a high-efficiency class D amplifier with low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8933B_1
Preliminary data sheet
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:
An additional UnBalance Protection (UBP) circuit compares the positive analog supply
voltage V
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:
In a symmetrical supply the UBP is released when the unbalance of the supply voltage is
within 6 % of its starting value.
Table 6
Table 6.
Protection
OTP
OCP
WP
UVP
OVP
UBP
•
•
•
•
If the supply voltage is pumped to higher values by the TDA8933B application itself
(see also
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.
LOW-level threshold: V
HIGH-level threshold: V
shows an overview of all protections and their effect on the output signal.
DDA
Overview of protections for the TDA8933B
with the negative analog supply voltage V
Section
Rev. 01 — 23 October 2008
14.8), the OVP is triggered and the TDA8933B is shut down. The
Restart
When fault is removed
no
yes
yes
no
no
no
P(th)(ubp)l
P(th)(ubp)h
< 8/5
> 8/3
V
V
HVPREF
HVPREF
SSA
and is triggered if the
Every 100 ms
yes
no
no
yes
yes
yes
Class D audio amplifier
TDA8933B
© NXP B.V. 2008. All rights reserved.
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