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參數(shù)資料
| 型號： | LD1117S25 |
| 廠商： | 意法半導體 |
| 英文描述： | BATTERY LITHIUM COIN 3V 12.5MM |
| 中文描述： | 低壓差固定或可調正電壓調節(jié)器 |
| 文件頁數(shù)： | 17/28頁 |
| 文件大小： | 624K |
| 代理商： | LD1117S25 |
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LD1117 SERIES
17/28
Figure 10: Post-Regulated Dual Supply
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 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.8).
相關PDF資料 |
PDF描述 |
|---|---|
| LD1117S25C | BATT 3V LITH CAMERA - BULK PKG |
| LD1117S28 | BATTERY LITHIUM COIN 3V W/TAB |
| LD1117V12 | BATTERY LITHIUM COIN 3V CELL |
| LD1117V12C | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| LD1117V18 | BATTERY LITHIUM 3V 24MM W/PCTERM |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LD1117S25 T&R | 制造商:STMicroelectronics 功能描述: |
| LD1117S25 | 制造商:STMicroelectronics 功能描述:V REG LDO 2.5V SMD 1117 SOT2233 |
| LD1117S25C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS |
| LD1117S25CTR | 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 負載調節(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 |
| LD1117S25CTR | 制造商:STMicroelectronics 功能描述:Voltage Regulator IC |
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