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參數(shù)資料
| 型號： | LD1117A |
| 廠商： | 意法半導(dǎo)體 |
| 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)： | 9/17頁 |
| 文件大?。?/td> | 249K |
| 代理商： | LD1117A |
LD1117A SERIES
9/17
Figure 9: Post-Regulated Dual Supply
LD1117A ADJUSTABLE: APPLICATION NOTE
The LD1117A 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 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
DJ
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 Fig. 10).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LD1117A-12-AA3-A-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117A-12-AB3-A-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117A-15-AA3-A-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117A-15-AB3-A-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117A-18-AA3-A-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
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