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| 型号： | TDF8553J |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 87 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM37 |
| 封装： | PLASTIC, SOT725-1 |
| 文件页数： | 47/47页 |
| 文件大小： | 391K |
| 代理商： | TDF8553J |
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TDF8553J_1
NXP B.V. 2008. All rights reserved.
Objective data sheet
Rev. 01 — 3 December 2008
9 of 47
NXP Semiconductors
TDF8553J
4
× 50 Watt power amplier and multiple voltage regulator
external pull-up resistor. If a failure occurs, pin DIAG remains LOW during the failure and
no clipping information is available. The microcontroller can read the failure information
via the I2C-bus.
8.5 Ampliers
8.5.1 Muting
A hard mute and a soft mute can both be performed via the I2C-bus. A hard mute mutes
the amplier within 0.5 ms. A soft mute mutes the amplier within 20 ms and is less
audible. A hard mute is also activated if a voltage of 8 V is applied to pin STB.
8.5.2 Temperature protection
If the average junction temperature rises to a temperature value that has been set via the
I2C-bus, a thermal protection pre-warning is activated making pin DIAG LOW. If the
temperature continues to rise, all four channels will be muted to reduce the output power
(soft thermal clipping). The value at which the temperature mute control activates is xed;
only the temperature at which the thermal protection pre-warning signal occurs can be
specied by bit D4 in instruction byte IB3. If implementing the temperature mute control
does not reduce the average junction temperature, all the power stages will be switched
off (muted) at the absolute maximum temperature Tj(max).
8.5.3 Offset detection
Offset detection can only be performed when there is no input signal to the ampliers, for
instance when the external digital signal processor is muted after a start-up. The output
voltage of each channel is measured and compared with a reference voltage. If the output
voltage of a channel is greater than the reference voltage, bit D2 of the associated data
byte is set and read by the microcontroller during a read instruction. Note that the value of
this bit is only meaningful when there is no input signal and the amplier is not muted.
Offset detection is always enabled.
8.5.4 Speaker protection
If one side of a speaker is connected to ground, a missing current protection is
implemented to prevent damage to the speaker. A fault condition is detected in a channel
when there is a mismatch between the power current in the high side and the power
current in the low side; during a fault condition the channel will be switched off.
The load status of each channel can be read via the I2C-bus: short to ground (one side of
the speaker connected to ground), short to VP (one side of the speaker connected to VP),
and shorted load.
8.5.5 Line driver mode
An amplier can be used as a line driver by switching it to low gain mode. In normal mode,
the gain between single-ended input and differential output (across the load) is 26 dB. In
low-gain mode the gain between single-ended input and differential output is 20 dB.
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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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