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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： | 46/47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
8 of 47
NXP Semiconductors
TDF8553J
4
× 50 Watt power amplier and multiple voltage regulator
8.
Functional description
The TDF8553 is a multiple voltage regulator combined with four independent audio power
ampliers congured in bridge tied load, with diagnostic capability. All regulator output
voltages except regulators 2 and 6 can be controlled via the I2C-bus.
The amplier diagnostic functions give information about output offset, load, or
short-circuit. Diagnostic functions are controlled via the I2C-bus. The TDF8553 is
protected against short-circuit, over-temperature, open ground and open VP connections.
If a short-circuit occurs at the output of a single amplier, that channel shuts down, and
the other channels continue to operate normally. The channel that has a short-circuit can
be switched off by the microcontroller via the appropriate enable bit of the I2C-bus to
prevent any noise generated by the fault condition from being heard.
8.1 Start-up
At power on, regulators 2 and 6 will reach their nal voltage when the backup capacitor
voltage exceeds 5.5 V independently of the voltage on pin STB. When pin STB is LOW,
the total quiescent current is low, and the I2C-bus lines are high impedance.
When pin STB is HIGH, the I2C-bus is biased on and then the TDF8553 performs a
power-on reset. When bit D0 of instruction byte IB1 is set, the amplier is activated, bit D7
of data byte DB2 (power-on reset occurred) is reset, and pin DIAG is no longer held LOW.
8.2 Start-up and shut-down timing
See Figure 12.
A capacitor connected to pin SVR enables smooth start-up and shut-down, preventing the
amplier from producing audible clicks at switch-on or switch-off. The start-up and
shut-down times can be extended by increasing the capacitor value.
If the amplier is shut down using pin STB, the amplier is muted, the regulators and
switches are switched off, and the capacitor connected to pin SVR discharges. The
low-current standby mode is activated 2 seconds after pin STB goes LOW.
8.3 Power-on reset and supply voltage spikes
If the supply voltage drops too low to guarantee the integrity of the data in the I2C-bus
latches, the power-on reset cycle will start. All latches will be set to a predened state,
pin DIAG will be pulled LOW to indicate that a power-on reset has occurred, and bit D7 of
data byte DB2 is also set for the same reason. When D0 of instruction byte IB1 is set, the
power-on ag resets, pin DIAG is released and the amplier will then enter its start-up
cycle.
8.4 Diagnostic output
Pin DIAG indicates clipping, thermal protection pre-warning of amplier and voltage
regulator sections, short-circuit protection, and low and high battery voltage. Pin DIAG is
an open-drain output, is active LOW, and must be connected to an external voltage via an
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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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