- 您现在的位置：买卖IC网 > PDF目录98165 > TAS5709PHPR (TEXAS INSTRUMENTS INC) 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 PDF资料下载
参数资料
| 型号： | TAS5709PHPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封装： | 7 X 7 MM, GREEN, PLASTIC, HTQFP-48 |
| 文件页数： | 9/60页 |
| 文件大小： | 1210K |
| 代理商： | TAS5709PHPR |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页
DETAILED DESCRIPTION
POWER SUPPLY
ERROR REPORTING
DEVICE PROTECTION SYSTEM
Overcurrent (OC) Protection With Current Limiting
www.ti.com ..................................................................................................................................... SLOS599A – NOVEMBER 2008 – REVISED SEPTEMBER 2009
To facilitate system design, the TAS5709 needs only a 3.3-V supply in addition to the (typical) 18-V power-stage
supply. An internal voltage regulator provides suitable voltage levels for the gate-drive circuitry. Additionally, all
circuitry requiring a floating voltage supply, e.g., the high-side gate drive, is accommodated by built-in bootstrap
circuitry requiring only a few external capacitors.
In order to provide good electrical and acoustical characteristics, the PWM signal path for the output stage is
designed as identical, independent half-bridges. For this reason, each half-bridge has separate bootstrap pins
(BST_X) and power-stage supply pins (PVDD_X). The gate-drive voltages (GVDD_AB and GVDD_CD) are
derived from the PVDD voltage. Special attention should be paid to placing all decoupling capacitors as close to
their associated pins as possible. In general, inductance between the power-supply pins and decoupling
capacitors must be avoided.
For a properly functioning bootstrap circuit, a small ceramic capacitor must be connected from each bootstrap pin
(BST_X) to the power-stage output pin (OUT_X). When the power-stage output is low, the bootstrap capacitor is
charged through an internal diode connected between the gate-drive regulator output pin (GVDD_X) and the
bootstrap pin. When the power-stage output is high, the bootstrap capacitor potential is shifted above the output
potential and thus provides a suitable voltage supply for the high-side gate driver. In an application with PWM
switching frequencies in the range from 352 kHz to 384 kHz, it is recommended to use 33-nF ceramic capacitors,
size 0603 or 0805, for the bootstrap supply. These 33-nF capacitors ensure sufficient energy storage, even
during minimal PWM duty cycles, to keep the high-side power stage FET (LDMOS) fully turned on during the
remaining part of the PWM cycle.
Special attention should be paid to the power-stage power supply; this includes component selection, PCB
placement, and routing. As indicated, each half-bridge has independent power-stage supply pins (PVDD_X). For
optimal electrical performance, EMI compliance, and system reliability, it is important that each PVDD_X pin is
decoupled with a 100-nF ceramic capacitor placed as close as possible to each supply pin.
The TAS5709 is fully protected against erroneous power-stage turnon due to parasitic gate charging.
Any fault resulting in device shutdown is signaled by the FAULT pin going low (see Table 1). A sticky version of
this pin is available on D1 of register 0x02.
Table 1. FAULT Output States
FAULT
DESCRIPTION
0
Overcurrent (OC) or undervoltage (UVP) error or overtemperature error (OTE) or overvoltage
ERROR
1
No faults (normal operation)
The device has independent, fast-reacting current detectors on all high-side and low-side power-stage FETs. The
detector outputs are closely monitored by two protection systems. The first protection system controls the power
stage in order to prevent the output current further increasing, i.e., it performs a cycle-by-cycle current-limiting
function, rather than prematurely shutting down during combinations of high-level music transients and extreme
speaker load-impedance drops. If the high-current condition situation persists, i.e., the power stage is being
overloaded, a second protection system triggers a latching shutdown, resulting in the power stage being set in
the high-impedance (Hi-Z) state. The device returns to normal operation once the fault condition (i.e., a short
circuit on the output) is removed. Current limiting and overcurrent protection are not independent for half-bridges.
That is, if the bridge-tied load between half-bridges A and B causes an overcurrent fault, half-bridges A, B, C,
and D are shut down.
Copyright 2008–2009, Texas Instruments Incorporated
17
相关PDF资料 |
PDF描述 |
|---|---|
| TAS5709PHP | 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| TAS5710PHPR | 20.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| TAS5710PHP | 20.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| TAS5715PHPR | 41.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| TAS5715PHP | 41.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5709PHPRG4 | 功能描述:音频放大器 20W Stereo I2S input Aud Pwr 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 |
| TAS5710 | 制造商:TI 制造商全称:Texas Instruments 功能描述:20-W STEREO DIGITAL AUDIO POWER AMPLIFIER |
| TAS5710EVM | 功能描述:音频 IC 开发工具 TAS5710EVM Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TAS5710PHP | 功能描述:音频放大器 20W St Closed-loop I2S Audio 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 |
| TAS5710PHP | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS D, 20W HTQFP-48 |
发布紧急采购，3分钟左右您将得到回复。