tdf8590th-n1 NXP Semiconductors, tdf8590th-n1 Datasheet - Page 6

• 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
6.4.1 Thermal foldback
6.4.2 Overtemperature protection
6.4.3 Overcurrent protection
6.4 Protections
If two or more class-D amplifiers are used in the same audio application, it is
recommended to synchronize the switching frequency of all devices to an external clock
(see
The following protections are included in TDF8590TH:
The reaction of the device on the different fault conditions differs per protection and is
described in
If the junction temperature T
a smaller output signal and less dissipation. At T
If T
The OCP will detect a short-circuit between the loudspeaker terminals or if one of the
loudspeaker terminals is short-circuited to one of the supply lines.
If the output current tends to exceed the maximum output current of 8 A, the output
voltage of the TDF8590TH will be regulated to a level where the maximum output current
is limited to 8 A while the amplifier outputs remain switching, the amplifier does not shut
down. When this active current limiting continues longer than a time (see
capacitor on pin DIAG is discharged below a threshold value and the TDF8590TH shuts
down. Activation of current limiting and the triggering of the OCP is observed at pin DIAG
(see
A maximum value for the capacitor on pin DIAG is 47 pF. The reference voltage on pin
DIAG is V
•
•
•
•
•
j
Thermal Foldback (TF)
OverTemperature Protection (OTP)
OverCurrent Protection (OCP)
Window Protection (WP)
Supply voltage protections
– UnderVoltage Protection (UVP)
– OverVoltage Protection (OVP)
– Unbalance Protection (UBP)
> 160 C, then the OTP will shut down the power stage immediately.
Section
Figure
SSA
5).
Section 6.4.1
12.3).
. Pin DIAG should not be connected to an external pull-up.
Rev. 02 — 23 April 2007
to
2
j
> 145 C, then the TF gradually reduced the gain, resulting in
Section
80 W SE (4 ) or 1
6.4.5.
j
= 155 C the outputs are fully muted.
160 W BTL (8 ) class-D amplifier
TDF8590TH
© NXP B.V. 2007. All rights reserved.
Figure
5) the
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