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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： | 5/47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
13 of 47
NXP Semiconductors
TDF8553J
4
× 50 Watt power amplier and multiple voltage regulator
8.6.3 Backup function
The backup function is implemented by a switch function, which behaves like an ideal
diode between pins VP and BUCAP; the forward voltage of this ideal diode depends on
the current owing through it. The backup function supplies regulator 2 during brief
periods when no supply voltage is present on pin VP. It requires an external capacitor to
be connected to pin BUCAP and ground. When the supply voltage is present on pin VP
this capacitor will be charged to a level of VP 0.3 V. When the supply voltage is absent
from pin VP, this charge can then be used to supply regulator 2 for a brief period (tbackup)
calculated using the formula:
Example: VP = 14.4 V, VREG2 (voltage on pin REG2) = 3.3 V, RL =1k and
Cbackup = 100 F provides a tbackup of 321 ms.
When an overvoltage condition occurs, the voltage on pin BUCAP is limited to
approximately 24 V; see Figure 5.
8.6.4 Power switches
There are two power switches that provide an unregulated DC voltage output for
ampliers and an aerial motor respectively. The switches have internal protection for
over-temperature conditions and are activated by setting bits D2 and D3 of instruction
byte IB1 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 5.
Backup capacitor function
t
backup
C
backup
R
L
V
P
V
REG2
0.5
–
()
–
V
REG2
-----------------------------------------------
×
=
V
(V)
t (s)
tbackup
out of regulation
VREG2
VBUCAP
VP
001aai693
t
backup
C
backup
V
P
V
REG2
0.5
–
()
–
I
load
------------------------------------------------
×
=
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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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