TDF8555J NXP Semiconductors, TDF8555J Datasheet - Page 24

• Manufacturer Part Number: TDF8555J
• Description: The TDF8555J is one of a new generation of complementary quad Bridge-Tied Load(BTL) audio power amplifiers with full I²C-bus controlled diagnostics, multiple voltageregulator and two power switches intended for automotive applications
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDF8555J
Product data sheet
8.7 Protection
8.8 Temperature protection
All regulator and switch outputs are fully protected against load dump and short-circuit
(foldback current protection); see
the output of regulator 2 and regulator 6, will go LOW. The power switches can withstand
‘loss of ground’ which means that pin GND is disconnected and the switch output is
connected to ground.
The amplifier is switched off when the regulator junction temperature becomes too high to
prevent undefined audio signals when the regulators are switched off while the amplifier is
still on. A regulator junction temperature that is too high is indicated by pin DIAG and can
be read out via the I
If the junction temperature still increases and the regulator reaches the maximum
temperature protection level, all regulators and switches will be disabled except the
outputs of regulator 2 and 6.
Fig 15. Foldback current protection
All information provided in this document is subject to legal disclaimers.
V
O(reg)
2
C-bus DB2[D6].
Rev. 1 — 15 September 2011
I
OS
4 45 W power amplifier with multiple voltage regulator
Figure
15. At load dump, all regulator outputs, except
I
Olim
001aan206
I
O(reg)
TDF8555J
© NXP B.V. 2011. All rights reserved.
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