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| 型号： | TAS5121DKDRE4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 100 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | GREEN, PLASTIC, HSSOP-36 |
| 文件页数： | 2/21页 |
| 文件大小： | 591K |
| 代理商： | TAS5121DKDRE4 |
TAS5121
SLES086A NOVEMBER 2003 REVISED MARCH 2004
www.ti.com
10
THEORY OF OPERATION
POWER SUPPLIES
This power device requires only two power supply
voltages, GVDD_x and PVDD_x.
GVDD_x is the gate drive supply for the device, which is
usually supplied from an external 12-V power supply.
GVDD_x is also connected to an internal LDR that
regulates the GVDD_x voltage down to the logic power
supply, 3.3 V, for the TAS5121 internal logic blocks. Each
GVDD_x pin is decoupled to system ground by a 1-
F
capacitor.
PVDD_x is the H-bridge power supply. Two power pins are
provided for each half-bridge due to the high current
density. It is important to follow the circuit and PCB layout
recommendations for the design of the PVDD_x
connection. For component suggestions, see the Typical
System Configuration section in this document. For layout
guidelines, see the reference design layout for the
TAS5121. Following these recommendations is important
because they influence key system parameters such as
EMI, idle current, and audio performance.
When GVDD_x is applied, while RESET is held low, the
error latches are cleared, SHUTDOWN is set high, and the
outputs are held in a high-impedance state. The bootstrap
capacitor is charged by the current path through the
internal bootstrap diode and external resistors placed on
the PCB from each OUT_x pin to ground. A subsequent
section describes the charging of the bootstrap capacitor.
Ideally, PVDD_x is applied after GVDD_x. When GVDD_x
and PVDD_x are applied, the TAS5121 is ready for
operation. PWM input signals can then be applied any time
during the power-on sequence, but they must be active
and stable before RESET is set high.
RECOMMENDATIONS FOR POWERING UP
RESET
GVDD
PVDD_X
PWM_xP
> 1 ms
The following table describes the input conditions and the
output states of the device:
INPUTS
OUTPUTS
Condition
RESET
PWM
_AP
PWM
_BP
SHUT-
DOWN
OUT_
A
OUT_
B
Condition
Description
X
0
Hi-Z
Shutdown
0
X
1
Hi-Z
Reset
1
0
1
GND
1
0
1
PVDD
Normal
1
0
1
GND
PVDD
Normal
1
PVDD
Reserved
After the previously mentioned conditions are met, the
device output begins. If PWM_AP is equal to a high and
PMW_BP is equal to a low, the high-side MOSFET in the
A half-bridge of the output H-bridge conducts while the
low-side MOSFET in the A half-bridge is not conducting.
Because the source of the high-side MOSFET is
referenced to the drain of the low-side MOSFET, a
bootstrapped gate drive is used to eliminate the need for
additional high-voltage power supplies. Under the above
condition, the opposite is true for the B half-bridge of the
output H-bridge. The low-side MOSFET in B half-bridge
conducts while the high-side MOSFET is not conducting;
therefore, the load connected between the OUT_A and
OUT_B pins has PVDD applied to it from the A side while
ground is applied from the B side for the period of time
PWM_AP is high and PWM_BP is low. Furthermore, when
the PWM signals change to the condition where PWM_AP
is low and PWM_BP is high, the opposite condition exists.
A constant high level is not permitted on the PWM inputs.
This condition causes the bootstrap capacitors to
discharge and can cause device damage.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5121I | 制造商:TI 制造商全称:Texas Instruments 功能描述:DIGITAL AMPLIIFIER POWER STAGE |
| TAS5121IDKD | 功能描述:音频放大器 Digital Amplifier Power Stage 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 |
| TAS5121IDKDE4 | 功能描述:音频放大器 Digital Amplifier Power Stage 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 |
| TAS5121IDKDR | 功能描述:音频放大器 Digital Amplifier Power Stage 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 |
| TAS5121IDKDRE4 | 功能描述:音频放大器 Digital Amplifier Power Stage 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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