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參數(shù)資料
| 型號： | TDF8546SD/N1 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 44 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM27 |
| 封裝： | PLASTIC, SOT878-1, 27 PIN |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 511K |
| 代理商： | TDF8546SD/N1 |
TDF8546
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 30 August 2011
7 of 61
NXP Semiconductors
TDF8546
I2C-bus controlled 4
45 W best efficiency amplifier
7.
Functional description
The TDF8546 is a complementary quad BTL audio power amplifier made with SOI-based
BCDMOS technology. It contains four independent amplifiers in a BTL configuration; see
Figure 1. The amplifier remains fully operational at a battery voltage as low as 6 V. Below
6 V, a crank detector is activated to shut down the amplifier without audible plops.
A new best efficiency principle uses a patented switch technique that reduces the
switching distortion and reduces dissipation by using the audio information on all four
channels instead of only the front or rear signals.
The TDF8546 is protected against overvoltage, short-circuit, overtemperature, open
ground and open VP connections.
The diagnostics for temperature and clip levels are programmable via the I2C-bus, and the
information indicated at diagnostic pins DIAG and STB is selectable. The status of each
amplifier can be read separately for output offset, load or no load, short-circuit or speaker
falsely connected.
During amplifier start-up the built-in start-up diagnostics can be used to detect shorted
load, open load, short to ground or short to VP. The TDF8546 is software and hardware
compatible with its predecessors: stand-alone amplifiers TDA8594 and TDA8595.
A resistor can be connected to pin ADSEL and ground to emulate an I2C-bus address that
is determined by the resistor value. Up to four different I2C-bus addresses are possible;
see Table 8. If pin ADSEL is shorted to ground, the TDF8546 operates in legacy mode. In
this mode, the I2C-bus is not needed and the function of pin STB changes from 2-level
(stand-by mode and on mode) to a 3-level pin (stand-by mode, on mode and mute).
The output stage of an amplifier channel consists of two PDMOS power transistors and
two NDMOS transistors in BTL configuration and ensures a high power output signal with
perfect sound quality. The BCDMOS process is used with an isolated SOI substrate which
ensures a robust amplifier, where latch-up cannot occur, and low crosstalk between the
channels with every component isolated, without substrate currents.
The input stage is biased (at 0.23
battery voltage + 1.4 V) and can accept an input
voltage of up to 8 V (peak). The DC input bias voltage can be measured on pin SVR. At a
bias voltage of 0.23
battery voltage + 1.4 V (= 4.7 V at a supply of 14.4 V), the input
capacitors can remain biased even with an engine start crank as low as 6 V. If the input
capacitors are allowed to discharge quickly, a small input signal is caused by a different
input time-constant due to a different AC ground and input capacitor. This small input
signal would be amplified to the output resulting in an audible plop noise.
7.1 Start-up and shut-down sequence
The capacitor on pin SVR is used for smooth start-up and shut-down which prevents the
amplifier from producing switch-on or -off plop noise. Increasing the SVR capacitor value
increases start-up and shut-down time.
If the amplifier is switched on in I2C-bus mode (IB1[D0] = 1) or in legacy mode
(VSTB > 2.5 V), the amplifier output voltage rises to 1.4 V less than half the supply voltage
with the output muted. When the output voltage is half the supply voltage, the start-up
mute is either released, if the I2C-bus is set to unmute (VSTB > 5.9 V in legacy mode), or
stays in mute if the bits are set to mute (2.5 V < VSTB < 4.5 V in legacy mode).
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