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參數(shù)資料
| 型號： | LD1117AD2MTR |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/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)： | 13/27頁 |
| 文件大?。?/td> | 406K |
| 代理商： | LD1117AD2MTR |
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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
相關PDF資料 |
PDF描述 |
|---|---|
| LD1117ADT-TR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LD1117ASTR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LD1117AS18TR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LD1117BS18TR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LD1117BS25TR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LD1117ADT | 制造商:STMicroelectronics 功能描述: |
| LD1117ADT1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117ADT12TR | 功能描述:低壓差穩(wěn)壓器 - LDO Lo drop fixed adjust pos Vltg reg RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LD1117ADT18 | 制造商:STMicroelectronics 功能描述: |
| LD1117ADT18TR | 功能描述:低壓差穩(wěn)壓器 - LDO LDO REG RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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