lm4801 National Semiconductor Corporation, lm4801 Datasheet - Page 11

• Manufacturer Part Number: lm4801
• Description: 1w Stereo Audio Amplifier Plus Adjustable Ldo
• Manufacturer: National Semiconductor Corporation

LDO Typical Performance Characteristics
C
External Components Description
Components
(Refer to Figure 1.)
1.
2.
3.
4.
5.
6.
7.
OUT
= 2.2µF, C
C
C
R
R
R
R
C
B
s
1
2
i
i
f
CC
The Inverting input resistance, along with R
filter with f
The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C
highpass filter with f
COMPONENTS, for an explanation of determining the value of C
The feedback resistance, along with R
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
The capacitor, C
PROPER EXTERNAL COMPONENTS section for information concerning proper placement and selecting
C
Combined with R
Combined with R
= 33nF, T
Power-Up Response
B
R
R
’s value.
1
2
= R
= (1.25V x R
2
J
c
((V
= 25˚C, V
= 1/(2πR
OUT
B
2
1
, filters the half-supply voltage present on the BYPASS pin. Refer to the SELECTING
, sets the LDO’s output voltage according to the following equation:
, sets the LDO’s output voltage according to the following equation:
/ 1.25V) -1)
1
) / (V
c
i
C
SHDN
= 1/(2πR
i
).
OUT
200736B4
= V
- 1.25V)
i
IN
C
i
. (Continued)
). Refer to the section, SELECTING PROPER EXTERNAL
i
, set the closed-loop gain.
Functional Description
11
f
, set the closed-loop gain. R
Unless otherwise specified, V
Power-Down Response
i
.
i
, along with C
IN
i
= V
, along with R
i
OUT
, form a high pass
+ 0.5V, C
200736B5
www.national.com
i
, create a
IN
=