TDF8590TH データシートの表示（PDF） - NXP Semiconductors.
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TDF8590TH Datasheet PDF : 30 Pages
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NXP Semiconductors
TDF8590TH
2 × 80 W SE (4 Ω) or 1 × 160 W BTL (8 Ω) class-D amplifier
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 Section 12.3).
6.4 Protections
The following protections are included in TDF8590TH:
• Thermal Foldback (TF)
• OverTemperature Protection (OTP)
• OverCurrent Protection (OCP)
• Window Protection (WP)
• Supply voltage protections
– UnderVoltage Protection (UVP)
– OverVoltage Protection (OVP)
– Unbalance Protection (UBP)
The reaction of the device on the different fault conditions differs per protection and is
described in Section 6.4.1 to Section 6.4.5.
6.4.1 Thermal foldback
If the junction temperature Tj > 145 °C, then the TF gradually reduced the gain, resulting in
a smaller output signal and less dissipation. At Tj = 155 °C the outputs are fully muted.
6.4.2 Overtemperature protection
If Tj > 160 °C, then the OTP will shut down the power stage immediately.
6.4.3 Overcurrent protection
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 τ (see Figure 5) the
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 Figure 5).
A maximum value for the capacitor on pin DIAG is 47 pF. The reference voltage on pin
DIAG is VSSA. Pin DIAG should not be connected to an external pull-up.
TDF8590TH_2
Product data sheet
Rev. 02 — 23 April 2007
© NXP B.V. 2007. All rights reserved.
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