Seamless sound experience for stop and start cars

NXP quad Class-AB
amplifiers TDF854x
for automotive and
transportation
Seamless 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
`` Keeps operating without audible disturbance during engine
start at a battery voltage as low as 6 V
`` Low Vp mute level adjustable via I2C (6 V, 8 V)
`` Optimized for low 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 W, 28 W)
`` Compatible with Best Efficiency quad amplifier (25 W, 28 W)
`` 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 high efficiency mode
APPLICATION
`` Automotive Head Unit
`` Automotive Hybrid Sound System
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 and TDF8544 are quad Class-AB amplifiers
with I2C-bus control. The TDF8541 and TDF8544 use an
Asymmetrical or ‘single ended’ input configuration, delivers
an output power of 25 W or 28 W, and are available in several
bend variants of DBS27 or HSOP36 package.
All amplifier qualified AEC -Q100
`` Indication of a short circuit at an amplifier output, short to
battery and ground
`` DC-load detection: open, short, and present (woofer)
`` AC-load detection: for tweeters via series capacitors
`` Programmable thermal pre-warning
`` Independent short-circuit protection per channel
`` Soft thermal clipping to prevent audio holes
All 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
`` Internally fixed gain of 16 dB or 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 are short-circuit proof to ground
`` Low Vp mute for fast mute Vp drops
`` Line driver mode (16 dB gain in BTL mode)
`` Low gain mode for booster mode during engine start
BEST EFFICIENCY MODE
TDF8546, TDF8546A, and TDF8548A are compatible ClassAB amplifiers with the added intelligence of a Best Efficiency
mode. In this mode, the devices use the information on all four
channels to enable a 17% lower dissipation with uncorrelated
signals. The adaptive control increases efficiency. A patented
switch control lowers the switching distortion.
The TDF8546 and TDF8546A use an asymmetrical input
configuration, delivers 25 W of output power, and is available
condition
in several bend variants of DBS27 or HSOP36 package. The
TDF8548A uses an Asymmetrical or ‘single ended’ input
configuration, delivers an output power of 28 W, and is available
in several bend variants of DBS27 or HSOP36 package.
The bus-controlled features are as follows:
`` Diagnostic output gives clip information at selectable and
programmable THD levels (2%, 5%, and 10%)
Output power
14.4 V; 10% THD @ 4 Ω
Input configuration
Package Name
Class-AB amplifier with
I2C control
Class-AB amplifier with
Best Efficiency mode
25 W
Asymmetrical
DBS27
TDF8541J/JS/SD
TDF8546J/JS
TDF8546AJ/SD
25 W
Asymmetrical
HSOP36
TDF8541TH*
TDF8546ATH*
TDF8546TH*
28 W
Asymmetrical
DBS27
TDF8544AJ/SD
TDF8544J/SD
TDF8548AJ
28 W
Asymmetrical
HSOP36
TDF8544TH*
TDF8548ATH*
* Input and output pins use opposite configuration.
Package letters
Name
Description
Version
J
DBS27P
Plastic DIL-bent-SIL (special bent) power package; 27 leads
SOT827-1
JS
DBSMS27P
Plastic dual bent surface mounted SIL power package; 27 leads
SOT1154-1
SD
RDBS27P
Plastic rectangular-DIL-bent-SIL (reverse bent) power package; 27 leads
SOT878-1
TH
HSOP36
Plastic heat sink small outline package; 36 leads; low standoff height
SOT851-1
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© 2013 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: April 2013
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 17414
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
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