TDF8555J NXP Semiconductors, TDF8555J Datasheet - Page 2

• 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


Multiple regulator
Protection




























Programmable thermal pre-warning
If the temperature protection of the regulator is activated, the amplifier is muted
before the regulator is switched off
Loss of ground and open V
supply decoupling capacitor of 2200 F)
All amplifier outputs short-circuit proof to ground, supply voltage and across the
load (channel independent)
All pins short-circuit proof to ground
Temperature-controlled gain reduction to prevent audio holes at high junction
temperatures
Programmable low battery voltage detection to enable 7.5 V or 6 V minimum
battery voltage operation
Overvoltage protection (load-dump safe up to V
pre-warning at 16 V
Offset detection
Good stability for any regulator with almost any output capacitor
Six voltage regulators (microcontroller, display, audio processor, tuner, bus,
mechanical digital and drive)
I
Selectable output voltages for regulators 1, 4 and 5
Low dropout voltage PNP output stages
High supply voltage ripple rejection
Low noise for all regulators
Two power switches (antenna switch and amplifier switch)
Standby regulators 2 and 6 (microcontroller and I
load dump and thermal shut-down
Low standby quiescent current (only regulators 2 and 6 operational)
Second supply pin for connecting optional external DC-to-DC converter to reduce
internal dissipation of regulator 3
Backup functionality for regulator 2
If connection to the battery voltage is reversed, all regulator voltages will be zero
Able to withstand output voltages up to 18 V if supply line is short-circuited
Thermal protection to avoid thermal breakdown
Load-dump protection
Regulator outputs protected from DC short-circuit to ground or to supply voltage
All regulators protected by foldback current limiting
Power switches protected from loss-of-ground
2
C-bus controlled
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 15 September 2011
4 45 W power amplifier with multiple voltage regulator
P
safe (with 150 m series impedance and a maximum
P
2
= 50 V) and overvoltage
C-bus supply) operational during
TDF8555J
© NXP B.V. 2011. All rights reserved.
2 of 57