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参数资料
| 型号： | TDF8554J/N4 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 44 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM37 |
| 封装： | PLASTIC, SOT725-1, 37 PIN |
| 文件页数： | 55/56页 |
| 文件大小： | 597K |
| 代理商： | TDF8554J/N4 |
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TDF8554J
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 31 August 2011
8 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
7.
Functional description amplifier section
The TDF8554J is a complementary quad Bridge-Tied Load (BTL) audio power amplifier
made using SOI-based BCDMOS technology. It contains four independent amplifiers in a
BTL configuration. 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.
The TDF8554J 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. 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 diagnostic can be used to detect shorted
load, open load, short to ground or short to VP.
The input stage is biased at (0.23
battery voltage + 1.4 V) and can handle an input
voltage of 8 V peak. The DC input bias voltage can be measured on pin SVR. By biasing
the voltage on 0.23
battery voltage + 1.4 V (= 4.7 V at a supply voltage 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 (audible) input signal will be
generated caused by the difference in input time-constant (different AC ground and input
capacitor). This small input signal is amplified to the output and will generate plop noise at
the output.
The BCDMOS process with an isolated substrate ensures a robust amplifier (latch-up
cannot occur) and low crosstalk between the channels (every component isolated, no
substrate currents) resulting in perfect sound quality.
7.1 Start-up and shut-down timing
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), the amplifier output voltage is
charged to half the supply voltage.
To enable short start-up times, the 70 k
input resistance is reduced to 3 k during
start-up until just before the start-up mute release.
During start-up, the amplifier cannot distinguish between a short to ground or a speaker
fault. If a speaker fault occurs during start-up, the amplifier enters protection mode and
switches off that channel.
VP
35
power supply to voltage regulators
BUCAP
36
connection for backup capacitor
REG2
37
regulator 2 output; supply voltage to microcontroller
Table 3.
Pin description …continued
Symbol
Pin
Description
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| TDF8599TH | 70 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| TDF8704T/4-T | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO24 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDF8590TH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:2 X 80 W SE (4 OHM) or 1 X 160 W BTL (8 OHM) class-D amplifier |
| TDF8590TH/N1,118 | 功能描述:音频放大器 AMPLIFIER CLASS D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDF8590TH/N1S,118 | 功能描述:音频放大器 4/8 OHM CLASS D AMP RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDF8590TH/N1-T | 功能描述:音频放大器 AMPLIFIER CLASS D RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDF8590TH/N1TJ | 制造商:NXP Semiconductors 功能描述:- Tape and Reel |
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