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PDF TDF8546 Data sheet ( Hoja de datos )
| Número de pieza | TDF8546 | |
| Descripción | 4 x 45 W best efficiency amplifier | |
| Fabricantes | NXP Semiconductors | |
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TDF8546
I2C-bus controlled 4 45 W best efficiency amplifier
Rev. 8 — 27 September 2013
Product short data sheet
1. General description
The TDF8546 is one of a new generation of complementary quad Bridge-Tied Load (BTL)
audio power amplifiers intended for automotive applications. It has a best efficiency mode
with full I2C-bus controlled diagnostics, including start-up diagnostics. The TDF8546 can
operate at a battery voltage as low as 6 V making this amplifier suitable for stop/start-car
operation.
The new best efficiency principle uses a patented switch technique which reduces
switching distortion. To reduce power dissipation, the new best efficiency principle uses
the audio information on all four channels instead of only the front or rear signals.
Dissipation is more than 65 % less than standard BTL when used for front and rear
correlated audio signals. Dissipation is 35 % less than standard BTL when used for
uncorrelated (delayed) audio signals between front and rear. It is 17 % less for
uncorrelated audio signals when the front or rear information is used.
The amplifier uses a complementary DMOS output stage in a Silicon-On-Insulator (SOI)
based BCD process. The DMOS output stage ensures a high-power output signal with
perfect sound quality. The SOI-based BCD process ensures a robust amplifier, where
latch-up cannot occur, with good separation between the four independent channels, with
every component isolated and without substrate currents.
2. Features and benefits
Stop/start-car prepared: keeps operating without audible disturbance during engine
start at a battery voltage as low as 6 V
New best efficiency mode with patented low switching distortion
Extreme best efficiency mode (uses information from 4 channels) with 17 % less
dissipation for uncorrelated signals compared to 2-channel best efficiency mode.
Operates in either legacy (non-I2C-bus) or I2C-bus modes (3.3 V and 5 V compliant)
Four hardware-programmable I2C-bus addresses
Can drive 2 and 4 loads
Speaker fault detection
Start-up diagnostics with load detection: open, short, present; filtered for door-slam
and chatter relays
AC load (tweeter) detection with low and high current mode
Gain select after start-up without audible disturbance
Independent selectable soft mute of front and rear channels
Programmable gain (26 dB and 16 dB), independently programmable for the front and
rear channels
1 page  
NXP Semiconductors
TDF8546
I2C-bus controlled 4 45 W best efficiency amplifier
TAB 36
n.c. 35
n.c. 34
n.c. 33
PGND3 32
n.c. 31
ACGND 30
IN3 29
IN4 28
SGND 27
IN2 26
IN1 25
SVR 24
PGND1 23
n.c. 22
n.c. 21
n.c. 20
n.c. 19
TDF8546TH
Fig 2. Pin configuration TDF8546TH
1 OUT3-
2 OUT3+
3 VP1
4 OUT4-
5 PGND4
6 OUT4+
7 SCL
8 SDA
9 DIAG
10 ADSEL
11 STB
12 n.c.
13 OUT2+
14 PGND2
15 OUT2-
16 VP2
17 OUT1+
18 OUT1-
001aam684
TDF8546_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 27 September 2013
© NXP B.V. 2013. All rights reserved.
5 of 21
5 Page 
NXP Semiconductors
TDF8546
I2C-bus controlled 4 45 W best efficiency amplifier
Table 5. Characteristics …continued
Tamb = 25 C; VP = 14.4 V; unless otherwise specified. Tested at Tamb = 25 C; guaranteed for Tj = 40 C to +150 C;
functionality is guaranteed for VP < 10 V unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
tsudiag
start-up diagnostic time
from start-up diagnostic
50 130 250 ms
command via I2C-bus until
completion of start-up diagnostic;
VO + < 0.1 V; VO < 0.1 V (no
load) IB1[D1] = 1;
td(sudiag-on)
start-up diagnostic to on delay at 90 % of output signal;
time IB1[D0:D1] = 11;
- 680 - ms
Voffset
offset voltage
start-up diagnostic offset voltage
under no load condition
1.3 2
2.5 V
RLdet(sudiag)
start-up diagnostic load
detection resistance
shorted load
high gain; IB3[D6:D5] = 00
- - 0.5
low gain; IB3[D6:D5] = 11
- - 1.5
normal load
high gain (IB3[D6:D5] = 00)
1.5 -
20
low gain (IB3[D6:D5] = 11)
3.2 -
20
line driver load
80 -
200
open load
400 - -
Amplifier diagnostics
VOL(DIAG)
LOW-level output voltage on pin fault condition; IDIAG = 1 mA
DIAG
- - 0.3 V
VO(offset_det)
output voltage at offset
detection
1.0 1.3 2.0 V
THDclip
total harmonic distortion clip
detection level
VP > 10 V
IB2[D7:D6] = 10
- 10 - %
IB2[D7:D6] = 01
- 5- %
IB2[D7:D6] = 00
- 2- %
Tj(AV)(pwarn)
pre-warning average junction
temperature
IB3[D4] = 0 or legacy mode
IB3[D4] = 1
150 160 170 C
125 135 145 C
Tj(AV)(G(0.5dB)) average junction temperature Vi = 0.05 V; best efficiency mode
for 0.5 dB gain reduction
turns off when activated
-
175 -
C
G(th_fold)
gain reduction of thermal
foldback
when all channels switch off
- 20 - dB
Io output current
I2C-bus mode; IB5[D7] = 0; AC
load bit set; peak current
IB4[D1] = 1
500 - - mA
IB4[D1] = 0
275 - - mA
I2C-bus mode; IB5[D7] = 0; AC
load bit not set; peak current
IB4[D1] = 1
- - 250 mA
IB4[D1] = 0
- - 100 mA
TDF8546_SDS
Product short data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 27 September 2013
© NXP B.V. 2013. All rights reserved.
11 of 21
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet TDF8546.PDF ] | |
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