參數(shù)資料
型號(hào)： LD1117ADT-TR
廠商： 意法半導(dǎo)體
元件分類(lèi)： 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(yè)數(shù)： 13/27頁(yè)
文件大?。?/td> 406K
代理商： LD1117ADT-TR
LD1117A series
LD1117A Adjustable: Application note
13/27
6
LD1117A Adjustable: Application note
The LD1117 Adjustable has a thermal stabilized 1.25±0.012V reference voltage between
the OUT and ADJ pins. I
ADJ
is 60μA typ. (120μA max.) and
I
ADJ
is 1μA typ. (5μA max.).
R1 is normally fixed to 120
. From
Figure 6.
we obtain:
V
OUT
= V
REF
+ R2 (I
ADJ
+I
R1
) = V
REF
+ R2 (I
ADJ
+V
REF
/R
1
) = V
REF
(1 + R2 / R
1
) + R2 x
I
ADJ
.
In normal application R2 value is in the range of few k
, 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 10μF electrolytic capacitor
placed in parallel to the R2 resistor (see
Figure 9.
).
Figure 9.
Adjustable output voltage application
Figure 10.
Adjustable output voltage application with improved ripple rejection
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LD1117-AG-XX-AA3-A-R 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
LD1117-AG-XX-AA3-A-T 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
LD1117-AG-XX-AA3-B-R 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
LD1117-AG-XX-AA3-B-T 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
LD1117-AG-XX-AA3-C-R 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
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