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参数资料
| 型号： | TS4962MEIJT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封装： | ROHS COMPLIANT, FCP-9 |
| 文件页数： | 24/41页 |
| 文件大小： | 1104K |
| 代理商： | TS4962MEIJT |
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Application information
TS4962M
30/41
5.5
Decoupling of the circuit
A power supply capacitor, referred to as CS, is needed to correctly bypass the TS4962M.
The TS4962M has a typical switching frequency at 250kHz and output fall and rise time
about 5ns. Due to these very fast transients, careful decoupling is mandatory.
A 1F ceramic capacitor is enough, but it must be located very close to the TS4962M in
order to avoid any extra parasitic inductance created an overly long track wire. In relation
with dI/dt, this parasitic inductance introduces an overvoltage that decreases the global
efficiency and, if it is too high, may cause a breakdown of the device.
In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its
current capability is also important. A 0603 size is a good compromise, particularly when a
4
Ω load is used.
Another important parameter is the rated voltage of the capacitor. A 1F/6.3V capacitor
used at 5V, loses about 50% of its value. In fact, with a 5V power supply voltage, the
decoupling value is about 0.5F instead of 1F. As CS has particular influence on the
THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In
addition, less decoupling means higher overshoots, which can be problematic if they reach
the power supply AMR value (6V).
5.6
Wake-up time (tWU)
When the standby is released to set the device ON, there is a wait of about 5ms. The
TS4962M has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
5.7
Shutdown time (tSTBY)
When the standby command is set, the time required to put the two output stages into high
impedance and to put the internal circuitry in shutdown mode, is about 5ms. This time is
used to decrease the gain and avoid any pop noise during shutdown.
5.8
Consumption in shutdown mode
Between the shutdown pin and GND there is an internal 300k
Ω resistor. This resistor forces
the TS4962M to be in standby mode when the standby input pin is left floating.
However, this resistor also introduces additional power consumption if the shutdown pin
voltage is not 0V.
For example, with a 0.4V standby voltage pin, Table 2: Operating conditions on page 3,
shows that you must add 0.4V/300k
Ω= 1.3A in typical (0.4V/273kΩ=1.46A in maximum)
to the shutdown current specified in Table 4 on page 5.
5.9
Single-ended input configuration
It is possible to use the TS4962M in a single-ended input configuration. However, input
coupling capacitors are needed in this configuration. The schematic in Figure 61 shows a
single-ended input typical application.
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4962MEIKJT | 功能描述:3 W FILTER-FREE CLASS D AUDIO PO 制造商:stmicroelectronics 系列:- 包装:剪切带（CT） 零件状态:在售 类型:D 类 输出类型:1-通道（单声道） 不同负载时的最大输出功率 x 通道数:2.8W x 1 @ 4 欧姆 电压 - 电源:2.4 V ~ 5.5 V 特性:消除爆音，差分输入，待机，热保护 工作温度:-40°C ~ 85°C（TA） 供应商器件封装:9-覆晶 封装/外壳:9-UFBGA 标准包装:1 |
| TS4972 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| TS4972_04 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W Audio Power Amplifier with Standby Mode Active High |
| TS4972EIJT | 功能描述:音频放大器 1.2W audio power amp W/Standby 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 |
| TS4972EIJT1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W Audio Power Amplifier with Standby Mode Active High |
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