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| 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： | 15/56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
22 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
8.4 Reset
output
A reset pulse is generated at pin RST when the output voltage of regulator 2 rises above
the reset threshold value. The reset output is a push-pull output that both sources and
sinks current. The output voltage can switch between ground and VO(REG2), and operates
at a low regulator 2 voltage or VBUCAP. The RST signal is controlled by a low-voltage
detection circuit which, when activated, pulls pin RST LOW (reset active) when VO(REG2)
is
V
th(rst). If VO(REG2) Vth(rst), pin RST goes HIGH. The reset pulse is delayed by 40 s
internally. To extend the delay and to prevent oscillations occurring at the threshold
voltage, an external capacitor can be connected to pin RESCAP. Note that a reset pulse is
not generated when VO(REG2) falls below the reset threshold value.
8.5 Reset delay capacitor
A Reset Delay Capacitor (RDC) connected to pin RESCAP can be used to extend the
delay period of the reset pulse and to ensure that a clean reset signal is sent to the
microcontroller. The RDC is charged by a current source. The reset output (pin RST) will
be released (pin RST goes HIGH) when the RDC voltage crosses the RDC threshold
value.
8.6 Power switches
There are two power switches that provide an unregulated DC voltage output for
amplifiers and an aerial motor respectively. The switches have internal protection for
overtemperature conditions and are activated by setting bits IB1[D2] and IB1[D3] to
logic 1.
In the ON state, the switches have a low impedance to the battery voltage. When the
battery voltage is higher than 22 V, the switches are switched off. When the battery
voltage is below 22 V the switches are set to their original condition.
The power switches have built-in surge protection to be able to absorb energy from
switching inductive or capacitive external loads. This surge protection is implemented in
such a way that in case no supply (VP) is present, the supply line will not be charged from
a possible external source connected to a power switch output.
Fig 14. Backup capacitor function
supply
(V)
t (s)
tdelay
out of regulation
VREG2
VBUCAP
VP
001aai693
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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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