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PDF TDF8551J Data sheet ( Hoja de datos )
| Número de pieza | TDF8551J | |
| Descripción | I2C-bus controlled 4 x 45 W power amplifier | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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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 Ω load with a battery voltage of up to 16 V and a 4 Ω 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
1 page  
NXP Semiconductors
6. Block diagram
TDF8551J
4 × 45 W power amplifier with six voltage regulators
BUCAP
36
BACKUP
SWITCH
REGULATOR 6
28 REG6
REGULATOR 2
37 REG2
REFERENCE
VOLTAGE
TEMPERATURE AND
LOAD DUMP
PROTECTION VOLTAGE
REGULATOR
VP 35
VDCDC 26
ENABLE
LOGIC
REGULATOR 1
REGULATOR 3
REGULATOR 4
REGULATOR 5
SWITCH 1
SWITCH 2
SDA
SCL
STB
2
4
22
STANDBY/MUTE
I2C-BUS
INTERFACE
TDF8551J
CLIP DETECT/DIAGNOSTIC
30 REG1
31 REG3
33 REG4
34 REG5
29 SW1
27 SW2
32 GND
20 VP1
6 VP2
25
DIAG
11
IN1
15
IN2
12
IN3
14
IN4
VP
Fig 1. Block diagram
10
SVR
MUTE
MUTE
MUTE
MUTE
26 dB/
20 dB
26 dB/
20 dB
26 dB/
20 dB
26 dB/
20 dB
PROTECTION/
DIAGNOSTIC
PROTECTION/
DIAGNOSTIC
PROTECTION/
DIAGNOSTIC
PROTECTION/
DIAGNOSTIC
TEMPERATURE AND LOAD
DUMP PROTECTION
AMPLIFIER
13 16 8 1 18 24
SGND
PGND1
PGND3
ACGND
PGND2/TAB
PGND4
9 OUT1+
7 OUT1−
17 OUT2+
19 OUT2−
5 OUT3+
3 OUT3−
21 OUT4+
23 OUT4−
001aaj105
TDF8551J_2
Product data sheet
Rev. 02 — 18 August 2009
© NXP B.V. 2009. All rights reserved.
5 of 47
5 Page 
NXP Semiconductors
TDF8551J
4 × 45 W power amplifier with six voltage regulators
8.5.7.3 Load detection procedure
1. At start-up, enable the AC or DC load detection by setting bit IB1[D1] to logic 1.
2. After 250 ms the DC load is detected and the mute is released. This is inaudible and
can be implemented each time the IC is powered on.
3. When the amplifier start-up cycle is completed (after 1.5 s), apply an AC signal to the
input, and DC load bits D5 of each data byte should be read and stored by the
microcontroller.
4. After at least 3 periods of the input signal, the load status can be checked by reading
AC detect bits D4 of each data byte.
The AC load peak current counter can be reset by setting bit IB1[D1] to logic 0 and
then to logic 1. Note that this will also reset the DC load detection bits D5 in each data
byte.
8.5.8 Low headroom protection
The normal DC output voltage of the amplifier is set to half the supply voltage and is
related to the voltage on pin SVR. An external capacitor is connected to pin SVR to
suppress power supply ripple. If the supply voltage drops (at vehicle engine start), the DC
output voltage will follow slowly due to the affect of the SVR capacitor.
The headroom voltage is the voltage required for correct operation of the amplifier and is
defined as the voltage difference between the level of the DC output voltage before the VP
voltage drop and the level of VP after the voltage drop (see Figure 4).
At a certain supply voltage drop, the headroom voltage will be insufficient for correct
operation of the amplifier. To prevent unwanted audible noises at the output, the
headroom protection mode will be activated (see Figure 4). This protection discharges the
capacitors connected to pins SVR and ACGND to increase the headroom voltage.
supply
(V)
14
8.4
7
VP
SVR voltage
vehicle engine start
headroom voltage
amplifier
DC output voltage
Fig 4. Amplifier output during supply voltage drop
t (s)
001aai692
8.6 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
TDF8551J_2
Product data sheet
Rev. 02 — 18 August 2009
© NXP B.V. 2009. All rights reserved.
11 of 47
11 Page | ||
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| PDF Descargar | [ Datasheet TDF8551J.PDF ] | |
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