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| 型号： | TDF8599TD |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 70 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | PLASTIC, SOT851-2, HSOP-36 |
| 文件页数： | 7/53页 |
| 文件大小： | 329K |
| 代理商： | TDF8599TD |
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TDF8599_2
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 30 July 2009
15 of 53
NXP Semiconductors
TDF8599
I2C-bus controlled dual channel class-D power amplier
8.5.1 Thermal foldback
Thermal Foldback Protection (TFP) is activated when the average junction temperature
exceeds the threshold level (145
°C). TFP decreases amplier gain such that the
combination of power dissipation and Rth(j-a) create a junction temperature around the
threshold level. The device will not completely switch off but remains operational at the
lower output power levels. If the average junction temperature continues to increase, a
second built-in temperature protection threshold level shuts down the amplier completely.
8.5.2 Overtemperature protection
If the average junction temperature Tj > 160 °C, OverTemperature Protection (OTP) is
activated and the power stage shuts down immediately.
8.5.3 Overcurrent protection
OverCurrent Protection (OCP) is activated when the output current exceeds the maximum
output current of 8 A. OCP regulates the output voltage such that the maximum output
current is limited to 8 A. The amplier outputs keep switching and the amplier is NOT
shutdown completely. This is called current limiting.
OCP also detects when the loudspeaker terminals are short circuited or one of the
amplier’s demodulated outputs is short circuited to one of the supply lines. In either case,
the shorted channel(s) are switched off.
The amplier can distinguish between loudspeaker impedance drops and a low-ohmic
short across the load or one of the supply lines. This impedance threshold depends on the
supply voltage used. When a short is made across the load causing the impedance to
drop below the threshold level, the shorted channel(s) are switched off. They try to restart
every 50 ms. If the short circuit condition is still present after 50 ms, the cycle repeats. The
average power dissipation will be low because of this reduced duty cycle.
When a channel is switched off due to a short circuit on one of the supply lines, Window
Protection (WP) is activated. WP ensures the amplier does not start-up after 50 ms until
the supply line short circuit is removed.
Table 9.
Overview of protection types
Protection type
Reference
Thermal foldback
Overtemperature
Overcurrent
Window
DC Offset
Undervoltage
Overvoltage
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDF8599TD/N2,512 | 功能描述:音频放大器 IC AMP AUDIO PWR 85W 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 |
| TDF8599TD/N2,518 | 功能描述:音频放大器 IC AMP AUDIO PWR 85W 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 |
| TDF8599TH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier with load diagnostics |
| TDF8599TH/N2,512 | 功能描述:音频放大器 IC AMP AUDIO PWR 85W 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 |
| TDF8599TH/N2,518 | 功能描述:音频放大器 IC AMP AUDIO PWR 85W 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 |
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