TDF8546
I
2
C-bus controlled 4
45 W best efficiency amplifier
Rev. 5 — 17 January 2012
Product 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 I
2
C-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, and 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-I
2
C-bus) or I
2
C-bus modes (3.3 V and 5 V compliant)
Four hardware-programmable I
2
C-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
NXP Semiconductors
TDF8546
I
2
C-bus controlled 4
45 W best efficiency amplifier
Line driver mode supports engine start at a battery voltage as low as 6 V (16 dB and
mid-tap voltage 0.25V
P
)
Programmable clip detect: 2 %, 5 % or 10 %
Programmable thermal pre-warning
Pin STB can be programmed/multiplexed with second-clip detect
Clip information of each channel can be directed separately to pin DIAG or pin STB
Independent enabling of thermal-, clip- or load fault information (short across the load
or to V
P
or to ground) on pin DIAG
Loss-of-ground and open V
P
safe (minimum series resistance required)
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
P
= 50 V) with overvoltage pre-warning
at 16 V
Offset detection
3. Quick reference data
Table 1.
V
P(oper)
I
q
P
o
Quick reference data
Conditions
R
L
= 4
no load
no load; V
P
= 7 V
output power
R
L
= 4
;
V
P
= 14.4 V; maximum power;
V
i
= 2 V RMS square wave
R
L
= 4
;
V
P
= 15.2 V; maximum power;
V
i
= 2 V RMS square wave
R
L
= 4
;
V
P
= 14.4 V; THD = 0.5 %
R
L
= 4
;
V
P
= 14.4 V; THD = 10 %
R
L
= 2
;
V
P
= 14.4 V; THD = 10 %
R
L
= 2
;
V
P
= 14.4 V; maximum power;
V
i
= 2 V RMS square wave
THD
total harmonic
distortion
P
o
= 1 W to 12 W; f
i
= 1 kHz; R
L
= 4
;
BTL mode
P
o
= 1 W; f
i
= 1 kHz; R
L
= 4
;
high efficiency mode
P
o
= 4 W; f
i
= 1 kHz; R
L
= 4
;
high efficiency mode
V
n(o)
output noise voltage
filter 20 Hz to 22 kHz; R
S
= 1 k
amplifier mode
line driver mode
-
-
43
25
65
33
V
V
Min
6
-
-
37
41
18
23
40
58
-
-
-
Typ
14.4
260
190
40
45
20
25
44
64
0.01
0.015
0.03
Max
18
350
-
-
-
-
-
-
-
0.1
-
-
Unit
V
mA
mA
W
W
W
W
W
W
%
%
%
operating supply
voltage
quiescent current
Symbol Parameter
TDF8546
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5 — 17 January 2012
2 of 64
NXP Semiconductors
TDF8546
I
2
C-bus controlled 4
45 W best efficiency amplifier
4. Ordering information
Table 2.
Ordering information
Package
Name
TDF8546J/N1
TDF8546SD/N1
TDF8546TH/N1
TDF8546JS/N1
DBS27P
RDBS27P
HSOP36
DBSMS27P
Description
plastic DIL-bent-SIL (special bent) power package; 27 leads (lead length
6.8 mm)
plastic rectangular-DIL-bent-SIL (reverse bent) power package; 27 leads
(row spacing 2.54 mm)
plastic, heatsink small outline package; 36 leads; low standoff height
plastic dual bent surface mounted SIL power package; 27 leads
Version
SOT827-1
SOT878-1
SOT851-1
SOT1154-1
Type number
TDF8546
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5 — 17 January 2012
3 of 64
NXP Semiconductors
TDF8546
I
2
C-bus controlled 4
45 W best efficiency amplifier
5. Block diagram
ADSEL
1(10)
SDA
26(8)
SCL
23(7)
V
P1
21(3)
V
P2
7(16)
TDF8546
ENGINE START
PROTECTION
5(9)
2(11)
SELECT
DIAGNOSTIC/
CLIP DETECT
DIAG
STB
STANDBY/
FAST MUTE
I
2
C-BUS
IN1
12(25)
MUTE
8(18)
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
OUT1-
OUT1+
10(17)
IN2
13(26)
MUTE
4(15)
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
OUT2-
OUT2+
6(13)
IN3
16(29)
MUTE
18(2)
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
OUT3+
OUT3-
20(1)
IN4
15(28)
MUTE
V
P
22(6)
26 dB/
16 dB
PROTECTION/
DIAGNOSTIC
OUT4+
OUT4-
24(4)
27(36)
TAB
11(24)
SVR
14(27)
SGND
17(30)
ACGND
9(23)
PGND1
3(14)
PGND2
19(32)
PGND3
25(5)
PGND4
aaa-000989
Pin numbers in parentheses relate to type TDF8546TH (package HSOP36).
Fig 1.
Block diagram
TDF8546
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5 — 17 January 2012
4 of 64
NXP Semiconductors
TDF8546
I
2
C-bus controlled 4
45 W best efficiency amplifier
6. Pinning information
6.1 Pinning
ADSEL
STB
PGND2
OUT2-
DIAG
OUT2+
V
P2
OUT1-
PGND1
1
2
3
4
5
6
7
8
9
OUT1+ 10
SVR 11
IN1 12
IN2 13
SGND 14
IN4 15
IN3 16
ACGND 17
OUT3+ 18
PGND3 19
OUT3- 20
V
P1
21
OUT4+ 22
SCL 23
OUT4- 24
PGND4 25
SDA 26
TAB 27
aaa-000990
TDF8546J/SD/JS
Fig 2.
Pin configuration of TDF8546J/SD/JS (packages DBS27P, RDBS27P and
DBSMS27P)
TDF8546
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5 — 17 January 2012
5 of 64
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