NXP quad Class-AB
amplifiers TDF854x
for automotive
Continuous sound experience for
stop/start cars
Designed`for`use`in`stop/start`cars,`these`advanced`Class-AB`amplifiers`support`listening`to`audio`
streams`while`the`car’s`internal`power`supply`is`down`for`engine`start.`They`operate`in`the`range`
of`6`to`18`V.
Key features
`
` Supports`stop/start`cars`by`operating`voltage`range`of:``
6`-18`V
`
` Low`V
p
`mute`level`adjustable`via`I
2
C`(6,`8`V)`
`
` Optimized`for`low`pop`(switch-on`pop`guaranteed`in`test`
program)`
`
` Full`(start-up)`diagnostics`with`flexible`read-out
`
` Programmable`DIAG`pin`
`
` Second`clip-detect`pin`for`additional`front/rear`detection`
(mid-tone/bass)
`
` Family`approach`with`graduated`output`power`(25,`28`W)
`
` Compatible`with`Best-Efficiency`quad`amplifier`(25,`28`W)
Application
`
` Automotive`infotainment
The`TDF854x`family`reflects`NXP’s`ongoing`commitment`
to`improving`functionality`and`performance`in`automotive`
infotainment`systems.`Available`in`configurations`with`I
2
C-bus`
control`or`a`Best`Efficiency`mode,`they`operate`over`a`wide`
voltage`range`and`reduce`dissipation.
I
2
C-bus control
The`TDF8541,`TDF8542,`and`TDF8544`are`quad``
Class-AB`amplifiers`with`I
2
C-bus`control.`The`TDF8541`uses`
an`asymmetrical`input`configuration,`delivers`an`output`power`
of`25`W,`and`is`available`in`a`DBS27`or`HSOP36`package.`The`
TDF8542`uses`a`symmetrical`input`configuration,`delivers`an`
output`power`of`25`W,`and`is`housed`in`an`HSOP36`package.`
The`TDF8544`uses`an`asymmetrical`input`configuration,`
delivers`an`output`power`of`28`W,`and`is`available`in`a`DBS27`
or`HSOP36`package.`
All`three`devices`offer`the`following`features:
`
` Load`dump/over`voltage`protection`
`
` ` ll`amplifier`outputs`short`circuit`proof`to`ground,`supply`
A
voltage`and`across`the`load,`independent`per`channel`
`
` All`pins`short`circuit`proof`to`ground``
`
` Thermal`protection`to`avoid`thermal`breakdown`
`
` Selectable`gain`16/26`dB
`
` No`plops`when`switching:
` -`Switch`on/switch`off`
` -`Standby`and`mute
` -`Mute`and`operating`
`
` Single`mode`control`pin`(standby,`operating:`mute/on)
`
` Low`standby`current
`
` Low`power`dissipation`in`any`short-circuit`condition
`
` Outputs`short-circuit`proof`to`ground
`
` Low`V
p
`mute`for`fast`mute`V
p
`drops
`
` Line`driver`mode`(16`dB`gain`in`BTL`mode)
`
` `Line`driver`mode`supports`engine`start`down`to`6`V`
(16`dB`and`midtap`voltage`0.25`V
p
).
The`bus-controlled`features`are`as`follows:
`
` ` iagnostic`output`gives`clip`information`at`selectable`THD``
D
levels`(2,`5`and`10%)
`
` `ndication`of`a`short`circuit`at`an`amplifier`output,`short`to`
I
battery`and`ground
Output power
14.4 V; 10% THD @ 4 Ω
25`W
25`W
25`W
28`W
28`W
`
` DC-load`detection:`open,`short`and`present`(woofer)`
`
` AC-load`detection:`for`tweeters`via`series`capacitors
`
` Programmable`clip`detection:`2,`5`and`10%.
`
` Programmable`thermal`pre-warning`
`
` Independent`short-circuit`protection`per`channel
`
` Soft`thermal`clipping`to`prevent`audio`holes`
Best Efficiency mode
The`TDF8546`and`TDF8548`are`compatible`I²C`bus`controlled`
Class-AB`amplifiers`with`the`added`intelligence`of`a`Best`
Efficiency`mode.`In`this`mode,`the`devices`will`have`62%`less`
dissipation`compared`to`standard`Class-AB`amplifiers`with`
correlated`signals`between`front`and`rear`channels.`There`is`
a`4`channel`best`efficiency`mode`built`in`which`will`have`17%`
less`dissipation`than`the`commonly`used`2*2`channel`high`
efficiency`mode`when`there`is`uncorrelated`signals`between`
the`front`and`the`rear`speakers.`A`patented`best`efficiency`
control`will`have`a`low`distortion`at`higher`signals.
The`TDF8546`uses`an`asymmetrical`input`configuration,`
delivers`25`W`of`output`power,`and`is`available`in`a`DBS27`
or`HSOP36`package.`The`TDF8548`uses`an`asymmetrical`
input`configuration,`delivers`an`output`power`of`28`W,`and`is`
available`in`a`DBS27`or`HSOP36`package.`
`
Class-AB amplifier with I
2
C
control
TDF8541J/JS/SD
TDF8541TH*
TDF8542TH*
TDF8544J/JS/SD
TDF8544TH*
TDF8548J/JS/SD
TDF8548TH*
Input configuration
Asymmetrical
Asymmetrical
Symmetrical
Asymmetrical
Asymmetrical
Package
DBS27`(Best`Watt)
HSOP36
HSOP36
DBS27`(Best`Watt)
HSOP36
Class-AB amplifier with Best
Efficiency mode
TDF8546J/JS/SD
TDF8546TH*
*`input`pins`and`output`pins`on`opposite`configuration``
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© 2011 NXP Semiconductors N.V.
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Date of release: February 2011
Document order number: 9397 750 17062
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