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TDA8920BJ Datasheet(PDF) 10 Page - NXP Semiconductors

Part No. TDA8920BJ
Description  2 X 100 W class-D power amplifier
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 10 page
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9397 750 13356
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 1 October 2004
10 of 34
Philips Semiconductors
TDA8920B
2
× 100 W class-D power amplifier
8.3.3 Window Protection (WP)
During the start-up sequence, when pin MODE is switched from standby to mute, the
conditions at the output terminals of the power stage are checked. In the event of a
short-circuit at one of the output terminals to VDD or VSS the start-up procedure is
interrupted and the system waits for open-circuit outputs. Because the test is done before
enabling the power stages, no large currents will flow in the event of a short-circuit. This
system is called Window Protection (WP) and protects for short-circuits at both sides of
the output filter to both supply lines. When there is a short-circuit from the power PWM
output of the power stage to one of the supply lines (before the demodulation filter) it will
also be detected by the start-up safety test. Practical use of this test feature can be found
in detection of short-circuits on the printed-circuit board.
Remark: This test is operational during (every) start-up sequence at a transition between
Standby and Mute mode. However when the amplifier is completely shut-down due to
activation of the OverCurrent Protection (OCP) because a short 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-up until the short to the supply lines is removed.
8.3.4 Supply voltage protections
If the supply voltage drops below
±12.5 V, the UnderVoltage Protection (UVP) circuit is
activated and the system will shut-down 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
±33 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.
So in this case no timer of 100 ms is started.
An additional UnBalance Protection (UBP) circuit compares the positive analog (VDDA)
and the negative analog (VSSA) supply voltages and is triggered if the voltage difference
between them exceeds a certain level. This level depends on the sum of both supply
voltages. An expression for the unbalanced threshold level is as follows:
Vth(ub) ≈ 0.15 × (VDDA +VSSA).
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 9 V; see also Section 13.7.
In Table 4 an overview is given of all protections and the effect on the output signal.
[1]
Hysteresis of 20 degrees will influence restart timing depending on heatsink size.
Table 4:
Overview protections TDA8920B
Protection name
Complete shut-down
Restart directly
Restart every 100 ms
OTP
Y
Y [1]
N [1]
OCP
Y [2]
N [2]
WP
Y [3]
YN
UVP
Y
N
Y
OVP
YYN
UBP
Y
N
Y



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