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參數(shù)資料
| 型號： | LD1117D18CTR |
| 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)： | 23/38頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LD1117D18CTR |
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LD1117 series
LD1117 Adjustable: Application note
23/38
6
LD1117 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 120W. From figure 10 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 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 10μF electrolytic capacitor
placed in parallel to the R2 resistor (see Fig. 11).
Figure 10.
Adjustable output voltage application
Figure 11.
Adjustable output voltage application with improved ripple rejection
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| LD1117D18TR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
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| LD1117D25TR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LD1117D28TR | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LD1117D18TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117D25 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 0.8A Positive 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LD1117D25C | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 0.8A Positive 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LD1117D25CTR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117D25TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
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