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參數(shù)資料
| 型號： | LR1117 |
| 廠商： | 樂山無線電股份有限公司 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 121K |
| 代理商： | LR1117 |
LRC
LESHAN RADIO COMPANY,LTD.
L
R
1117/A ADJUSTABLE APPLICATION NOTE
The L
R
1117/A ADJUSTABLE has a thermal stabilized 1.25
r
0.012V reference voltage between the OUT and ADJ
pins. I
ADJ
is 60
P
A typ. (120
P
A max.) and
'
I
ADJ
is 1
P
A typ. (5
P
A max.).
R1 is normally fixed to 120
:
. From figure 7 we obtain:
V
OUT
=V
REF
+R2(I
ADJ
+ I
R1
)=V
REF
+ R2(I
ADJ
+ V
REF
/ R1)=V
REF
(1+R2/R1) + R2 x I
ADJ
.
In normal application R2 value is in the range of few Kohm,, so the R2 X I
ADJ
product could not be considered in the
V
OUT
calculation; then the above expression becomes: V
OUT
=V
REF
(1+R2/R1)
In order to have the better load regulation it is important to realize a good Kelvin connection of R1 and R2 resistors.
In particular R1 connection must be realized very close to OUT and ADJ pin, while R2 ground connection must be
placed as near as possible to the negative Load pin. Ripple rejection can be improved by introducing a 10
P
F
electrolytic capacitor placed in parallel to the R2 resistor (See Fig.
6
)
FIG.
5
Adjustable Output Voltage Application Circuit
FIG.
6
Adjustable Output Voltage Application with improved Ripple Rejection.
IN LR1117/A OUT
ADJ
1
3
2
10UF
10UF
V
OUT
=1.25V
V
IN
R1
120
10UF
IN LR1117/A OUT
ADJ
1
3
2
10UF
V
OUT
V
IN
R2
R1
120
V
REF
10UF
10UF
IN LR1117/A OUT
ADJ
1
3
2
10UF
V
OUT
V
IN
R2
R1
120
V
REF
FIG.
4
Adjustable Output
1.25
Voltage Application Circuit
7
/
10
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