Continous sound experience for stop/start cars

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 Vp mute level adjustable via I2C (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 I2C-bus
control or a Best Efficiency mode, they operate over a wide
voltage range and reduce dissipation.
I2C-bus control
The TDF8541, TDF8542, and TDF8544 are quad `
Class-AB amplifiers with I2C-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.
`` 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
All three devices offer the following features:
`` Load dump/over voltage protection
`` All amplifier outputs short circuit proof to ground, supply
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 Vp mute for fast mute Vp 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 Vp).
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 bus-controlled features are as follows:
`` Diagnostic output gives clip information at selectable THD levels (2, 5 and 10%)
`` Indication of a short circuit at an amplifier output, short to
battery and ground
Output power
14.4 V; 10% THD @ 4 Ω
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.
Input configuration
Package
Class-AB amplifier with I2C
control
Class-AB amplifier with Best
Efficiency mode
25 W
Asymmetrical
DBS27 (Best Watt)
TDF8541J/JS/SD
TDF8546J/JS/SD
25 W
Asymmetrical
HSOP36
TDF8541TH*
TDF8546TH*
25 W
Symmetrical
HSOP36
TDF8542TH*
28 W
Asymmetrical
DBS27 (Best Watt)
TDF8544J/JS/SD
TDF8548J/JS/SD
28 W
Asymmetrical
HSOP36
TDF8544TH*
TDF8548TH*
* input pins and output pins on opposite configuration www.nxp.com
© 2011 NXP Semiconductors N.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The
Date of release: February 2011
information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and
Document order number: 9397 750 17062
may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof
Printed in the Netherlands
does not convey nor imply any license under patent- or other industrial or intellectual property rights.
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