參數(shù)資料
型號： TS4962IQT
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 2.8 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8
封裝： 3 X 3 MM, ROHS COMPLIANT, DFN-8
文件頁數(shù)： 26/44頁
文件大小： 586K
代理商： TS4962IQT
Application information
TS4962
32/44
Doc ID 10968 Rev 8
4.5
Decoupling of the circuit
A power supply capacitor, referred to as CS, is needed to correctly bypass the TS4962.
The TS4962 has a typical switching frequency at 250 kHz and output fall and rise time about
5 ns. Due to these very fast transients, careful decoupling is mandatory.
A 1 F ceramic capacitor is enough, but it must be located very close to the TS4962 in order
to avoid any extra parasitic inductance being created by 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 1 F/6.3 V capacitor
used at 5 V loses about 50% of its value. In fact, with a 5 V power supply voltage, the
decoupling value is about 0.5 F instead of 1 F. 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 (6 V).
4.6
Wake-up time (tWU)
When the standby is released to set the device ON, there is a wait of about 5 ms. The
TS4962 has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
4.7
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 standby mode is about 5 ms. This time is used
to decrease the gain and avoid any pop noise during the shutdown phase.
4.8
Consumption in standby mode
Between the standby pin and GND there is an internal 300 k
Ω resistor. This resistor forces
the TS4962 to be in standby mode when the standby input pin is left floating.
However, this resistor also introduces additional power consumption if the standby pin
voltage is not 0 V.
For example, with a 0.4 V standby voltage pin, Table 3 on page 4 shows that you must add
0.4 V/300 k
Ω = 1.3 A typical (0.4 V/273 kΩ = 1.46 A maximum) to the standby current
specified in Table 5 on page 5.
相關PDF資料
PDF描述
TS4962MEIJT 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9
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相關代理商/技術參數(shù)
參數(shù)描述
TS4962M 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3W filter-free class D audio power amplifier
TS4962M_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3W filter-free class D audio power amplifier
TS4962MEIJT 功能描述:音頻放大器 3W Filter-Free Class D Power Amplifier RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TS4962MEIKJT 功能描述:3 W FILTER-FREE CLASS D AUDIO PO 制造商:stmicroelectronics 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:D 類 輸出類型:1-通道（單聲道） 不同負載時的最大輸出功率 x 通道數(shù):2.8W x 1 @ 4 歐姆 電壓 - 電源:2.4 V ~ 5.5 V 特性:消除爆音，差分輸入，待機，熱保護 工作溫度:-40°C ~ 85°C（TA） 供應商器件封裝:9-覆晶 封裝/外殼:9-UFBGA 標準包裝:1
TS4972 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH
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