參數(shù)資料
型號： LD1117BST-R
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
文件大小： 249K
代理商： LD1117BST-R
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).
相關(guān)PDF資料
PDF描述
LD1117AST-R Circular Connector; No. of Contacts:10; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:18; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:18-19 RoHS Compliant: No
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LD1117D 功能描述:低壓差穩(wěn)壓器 - LDO 1.25-15V 0.8A Adj 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
LD1117D 制造商:STMicroelectronics 功能描述:IC REG ADJ SMD 1117 SOIC8
LD1117D12 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
LD1117D12C 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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