參數(shù)資料
型號(hào): TA8215H
元件分類: 音頻/視頻放大
英文描述: 18 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM17
封裝: HZIP-17
文件頁數(shù): 7/12頁
文件大?。?/td> 1005K
代理商: TA8215H
TA8215H / L
2002-10-30
4
3. Preventive measure against oscillation
For preventing the oscillation, it is advisable to use C4, the condenser of polyester film having small
characteristic fluctuation of the temperture and the frequency.
The resistance R to be series applied to C4 is effective for phase correction of high frequency, and improves the
oscillation allowance.
Since the oscillation allowance is varied according to the causes described below, perform the temperature test to
check the oscillation allowance.
(1) Voltage gain to be used (GV setting)
(2) Capacity value of condenser
(3) Kind of condenser
(4) Layout of printed board
In case of its use with the voltage gain GV reduced or with the feedback amount increased, care must be taken
because the phase-inversion is caused by the high frequency resulting in making the oscillation liable generated.
4. Input offset prevention circuit at VCC→ON
Having Pre-Amp (Amp1) mounted on the primary stage, this IC contains the circuit for making the Amp1 input
voltage and the NF terminal voltage equipotential.
Therefore, the offset voltage produced at the input stage is suppressed to prevent the pop noise at VCC→ON. The
capacity values of the input and NF condense (C1 and C2) shall be set according to the gain to be used.
(Reference) (A) at GV = 50dB (Rf = 0) : C1 = 4.7F, C2 = 47F
(B) at GV = 40dB (Rf = 470) : C1 = 3.3F, C2 = 33F
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