參數(shù)資料
型號: TPA112DRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 0.07 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝: GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù): 15/29頁
文件大小: 707K
代理商: TPA112DRG4
www.ti.com
5-V VERSUS 3.3-V OPERATION
TPA112
SLOS212E – AUGUST 1998 – REVISED JUNE 2004
– Placing a 20-k
resistor, R
O, from the output of the IC to ground ensures that the coupling capacitor fully
discharges at power down. If the supply is rapidly cycled without this capacitor, a small pop may be audible
in 10-k
loads.
Using Low-ESR Capacitors
– Low-ESR capacitors are recommended throughout this application. A real capacitor can be modeled simply
as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial
effects of the capacitor in the circuit. The lower the equivalent value of this resistance, the more the real
capacitor behaves like an ideal capacitor.
The TPA112 is designed for operation over a supply range of 2.5 V to 5.5 V. This data sheet provides full
specifications for 5-V and 3.3-V operation because these are considered to be the two most common standard
voltages. There are no special considerations for 3.3-V versus 5-V operation as far as supply bypassing, gain
setting, or stability. The most important consideration is that of output power. Each amplifier in the TPA112 can
produce a maximum voltage swing of VDD – 1 V. This means, for 3.3-V operation, clipping starts to occur when
VO(PP) = 2.3 V, as opposed to VO(PP) = 4 V for 5-V operation. The reduced voltage swing subsequently reduces
maximum output power into the load before distortion begins to become significant.
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