參數(shù)資料
型號(hào)： LM4801MH/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 音頻／視頻放大
英文描述： 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO28
封裝： 4.40 MM, TSSOP-28
文件頁(yè)數(shù)： 3/20頁(yè)
文件大?。?/td> 725K
代理商： LM4801MH/NOPB
LDO Typical Performance Characteristics Unless otherwise specified, V
IN =VOUT + 0.5V, CIN =
COUT = 2.2F, CCC = 33nF, TJ = 25C, VSHDN =VIN. (Continued)
Power-Up Response
Power-Down Response
200736B4
200736B5
External Components Description
(Refer to Figure 1.)
Components
Functional Description
1.
R
i
The Inverting input resistance, along with R
f, set the closed-loop gain. Ri, along with Ci, form a high pass
filter with f
c = 1/(2
πR
iCi).
2.
C
i
The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C
i, along with Ri, create a
highpass filter with f
c = 1/(2
πR
iCi). Refer to the section, SELECTING PROPER EXTERNAL
COMPONENTS, for an explanation of determining the value of C
i.
3.
R
f
The feedback resistance, along with R
i, set the closed-loop gain.
4.
C
s
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
5.
C
B
The capacitor, C
B, filters the half-supply voltage present on the BYPASS pin. Refer to the SELECTING
PROPER EXTERNAL COMPONENTS section for information concerning proper placement and selecting
C
B’s value.
6.
R
1
Combined with R
2, sets the LDO’s output voltage according to the following equation:
R
1 =R2 ((VOUT / 1.25V) -1)
7.
R
2
Combined with R
1, sets the LDO’s output voltage according to the following equation:
R
2 = (1.25V x R1)/(VOUT - 1.25V)
LM4801
www.national.com
11
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