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TDF8551J Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer TDF8551J
Beschreibung I2C-bus controlled 4 x 45 W power amplifier
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 30 Seiten
TDF8551J Datasheet, Funktion
TDF8551J
I2C-bus controlled 4 × 45 W power amplifier with six voltage
regulators
Rev. 02 — 18 August 2009
Product data sheet
1. General description
1.1 Amplifiers
The TDF8551J has a complementary quad audio power amplifier that uses BCDMOS
technology. It contains four amplifiers configured in Bridge-Tied Load (BTL) to drive four
speakers: two front and two rear channels. The I2C-bus enables diagnostic information of
each amplifier and its speaker to be read separately. Both front and both rear channel
amplifiers can be configured independently in line driver mode with a gain of 20 dB
(differential output) or amplifier mode with a gain of 26 dB (BTL output).
1.2 Voltage regulators and switches
The TDF8551J has six output voltage regulators and two power switches:
Four switchable regulators and two standby regulators
Two power switches with loss-of-ground protection and surge protection
Second supply pin to reduce dissipation by means of an external DC-to-DC converter
Backup functionality for regulator 2
2. Features
I Amplifiers
N I2C-bus control
N Can drive a 2 load with a battery voltage of up to 16 V and a 4 load with a
battery voltage of up to 18 V
N DC load detection: open, short and present
N AC load (tweeter) detection
N Programmable clip detect; 1 % or 3 %
N Programmable thermal protection pre-warning
N Independent short-circuit protection for each channel
N Selectable line driver (20 dB) and amplifier mode (26 dB)
N Loss-of-ground and open VP safe
N All outputs protected from short-circuit to ground, to VP or across the load
N All pins protected from short-circuit to ground
N Soft thermal-clipping to prevent audio holes
N Low battery detection
I Voltage regulators and switches
N I2C-bus control






TDF8551J Datasheet, Funktion
NXP Semiconductors
7. Pinning information
7.1 Pinning
PGND2/TAB 1
SDA 2
OUT33
SCL 4
OUT3+ 5
VP2 6
OUT17
PGND1 8
OUT1+ 9
SVR 10
IN1 11
IN3 12
SGND 13
IN4 14
IN2 15
ACGND 16
OUT2+ 17
PGND3 18
OUT219
VP1 20
OUT4+ 21
STB 22
OUT423
PGND4 24
DIAG 25
VDCDC 26
SW2 27
REG6 28
SW1 29
REG1 30
REG3 31
GND 32
REG4 33
REG5 34
VP 35
BUCAP 36
REG2 37
Fig 2. Pin configuration
TDF8551J
4 × 45 W power amplifier with six voltage regulators
TDF8551J
001aaj106
TDF8551J_2
Product data sheet
Rev. 02 — 18 August 2009
© NXP B.V. 2009. All rights reserved.
6 of 47

6 Page









TDF8551J pdf, datenblatt
NXP Semiconductors
TDF8551J
4 × 45 W power amplifier with six voltage regulators
Second supply pin to reduce dissipation by means of an external DC-to-DC converter
Backup functionality for regulator 2
The TDF8551J uses low dropout voltage regulators for use in low voltage applications. All
of the voltage regulators except for the standby regulators can be controlled using the
I2C-bus.
The TDF8551J also has two power switches which can deliver unregulated continuous
current and several fail-safe protection modes.
It conforms to peak transient tests and protects against continuous high voltage (24 V),
short-circuits and thermal stress. Standby regulators 2 and 6 will try to maintain output for
as long as possible even if a thermal shutdown or any other fault condition occurs. During
overvoltage stress conditions, all outputs except regulators 2 and 6 will switch-off and the
device will be able to supply a minimum current for an indefinite amount of time sufficient
for powering the memory of a microcontroller and bus controller functionality. Provision is
made for an external reserve supply capacitor to be connected to pin BUCAP which can
store enough energy to allow regulator 2 to supply a microcontroller for a period long
enough for it to prepare for a loss-of-voltage.
8.6.1 Standby regulator outputs
Standby outputs (regulators 2 and 6) are used for the microcontroller and bus controller
supply. These regulators will not shutdown with the switched regulators and cannot be
controlled by the I2C-bus. The standby regulators will not shutdown during load dump
transients or by high temperature protection.
8.6.2 Backup capacitor
A backup capacitor (Cbackup) is used as a backup supply for the regulator 2 output when
the battery supply voltage (VP) cannot support the regulator 2 voltage.
8.6.3 Backup function
The backup function is implemented by a switch function, which behaves like an ideal
diode between pins VP and BUCAP; the forward voltage of this ideal diode depends on
the current flowing through it. The backup function supplies regulator 2 during brief
periods when no supply voltage is present on pin VP. It requires an external capacitor to
be connected to pin BUCAP and ground. When the supply voltage is present on pin VP
this capacitor will be charged to a level of VP 0.3 V. When the supply voltage is absent
from pin VP, this charge can then be used to supply regulator 2 for a brief period (tbackup)
calculated using the formula:
tbackup
=
C
b
ack
up
×
RL
×
V-----P---------(--VV-----RR---EE---GG---2-2--------0---.-5----)
Example: VP = 14.4 V, VREG2 (voltage on pin REG2) = 3.3 V, RL = 1 kand
Cbackup = 100 µF provides a tbackup of 321 ms.
When an overvoltage condition occurs, the voltage on pin BUCAP is limited to
approximately 24 V; see Figure 5.
(1)
TDF8551J_2
Product data sheet
Rev. 02 — 18 August 2009
© NXP B.V. 2009. All rights reserved.
12 of 47

12 Page





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