tdf8590th-n1 NXP Semiconductors, tdf8590th-n1 Datasheet - Page 8

• Manufacturer Part Number: tdf8590th-n1
• Description: Tdf8590th 2 X 80 W Se 4 Ohm Or 1 X 160 W Btl 8 Ohm Class-d Amplifier
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDF8590TH_2
Product data sheet
6.4.4 Window protection
6.4.5 Supply voltage protections
The WP checks the conditions at the output terminals of the power stage and is activated:
If the supply voltage drops below 12.5 V, the UVP circuit is activated and the
TDF8590TH switch-off will be silent and without pop noise. When the supply voltage rises
above 12.5 V, the TDF8590TH is restarted again after 100 ms.
If the supply voltage exceeds 33 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 33 V. So in this
case no timer of 100 ms is started. The maximum operating supply voltage is 29 V and if
the supply voltage is above the maximal allowable voltage of 34 V (see
TDF8590TH can be damaged, irrespective of an activated OVP. See
“Pumping effects”
An additional UBP circuit compares the positive analog (V
(V
the unbalance threshold level, which is expressed as follows:
When the supply voltage difference V
switches off and is restarted again after 100 ms.
Example: With a symmetrical supply of V
protection circuit will be triggered if the unbalance exceeds approximately 6 V.
In
Table 4.
[1]
[2]
V
Protection name Complete shut down Restart directly Restart every 100 ms
TF
OTP
OCP
WP
UVP
OVP
UBP
•
•
th unb
SSA
Table 4
During the start-up sequence, when pin MODE is switched from standby to mute. In
the event of a short-circuit at one of the output terminals to V
procedure is interrupted and the TDF8590TH waits until the short to the supply lines
has been removed. Because the test is done before enabling the power stages, no
large currents will flow in the event of a short-circuit.
When the amplifier is completely shut down due to activation of the 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.
Amplifier gain will depend on junction temperature and heat sink size.
Thermal foldback will influence restart timing depending on heat sink size.
) supply voltages and is triggered if the voltage difference between them exceeds
0.15
an overview is given of all protections and the effect on the output signal.
Overview protections TDF8590TH
V
for more information about the use of the OVP.
N
Y
N
Y
Y
Y
Y
DDA
[4]
[3]
–
Rev. 02 — 23 April 2007
V
SSA
2
80 W SE (4 ) or 1
V
DDA
Y
Y
Y
Y
N
Y
N
DDA
[1]
[2]
[3]
V
SSA
= 20 V and V
exceeds V
160 W BTL (8 ) class-D amplifier
N
N
N
N
Y
N
Y
DDA
SSA
[2]
[3]
th(unb)
) and the negative analog
= 20 V, the unbalance
TDF8590TH
DD
, the TDF8590TH
or V
Section 12.6
© NXP B.V. 2007. All rights reserved.
SS
Section
the start-up
DIAG
N
N
Y
Y
N
N
N
7), the
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