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參數(shù)資料
| 型號(hào)： | AP1186 |
| 英文描述： | 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| 中文描述： | 1.5A的超低壓差積極可調(diào)或固定模式調(diào)節(jié) |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 191K |
| 代理商： | AP1186 |
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Functional Descriptions(Continued)
AP1186
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep.7, 2004
5/8
Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically
AP1186-ADJ
Vin
Vctrl
Adj
Vout
Vsense
R1+
R2+
Vref
Iadj=50uA
The AP1186-ADJ keeps a constant 1.25V between
the Vsense pin and the Adj pin. By placing a
resistor R1 across these two pins and connecting
the Vsense ans Vout pin together, a constant
current flows through R1, adding to the Iadj current
and into the R2 resistor producing a voltage equal
to the (1.25/R1)*R2 + Iadj*R2. This voltage is then
added to the 1.25V to set the output voltage. This is
summarized in the above equation.
Since the minimum load current requirement of the
AP1186-ADJ is 10mA, R1 is typically selected to be
a 121
resistor so that it automatically satisfies this
condition. Notice that since the Iadj is typically in
the range of 50uA it only adds a small error to the
output voltage and should be considered when very
precise output voltage setting is required.
Load Regulation
Since the AP1186 has separate pins for the output
(Vout) and the sense (Vsense), it is ideal for
providing true remote sensing of the output voltage
at the load. This means that the voltage drops due
to parasitic resistance such as PCB traces between
the regulator and the load are compensated for
using remote sensing. Figure following shows a
typical application of the AP1186 with remote
sensing.
AP1186-ADJ
Vin
Vctrl
Vin
Vctrl
Vout
Vsense
Adj
R1
R2
R
L
Stability
The AP1186-XXX requires the use of an output
capacitor as part of the frequency compensation in
order to make the regulator stable. Typical designs
for the microprocessor applications use standard
electrolytic capacitors with typical ESR in the range
of 50 to 100m
and an output capacitance of
100uF to 1000uF. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed
RC time constant. The AP1186-XXX takes
advantage of the phenomena in making the
overall regulator loop stable.
For most applications a minimum of 100uF
aluminum electrolytic capacitor insures both stability
and good transient response.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AP1186K5 | 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| AP1186K515 | 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| AP1186K515A | 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| AP1186K515L | 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| AP1186K515LA | 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AP1186K5 | 制造商:DIODES 制造商全稱:Diodes Incorporated 功能描述:1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR |
| AP1186K515 | 制造商:ANACHIP 制造商全稱:Anachip Corp 功能描述:1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| AP1186K515A | 制造商:ANACHIP 制造商全稱:Anachip Corp 功能描述:1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| AP1186K515L | 制造商:ANACHIP 制造商全稱:Anachip Corp 功能描述:1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator |
| AP1186K5-15L-13 | 功能描述:低壓差穩(wěn)壓器 - LDO LDO BI 1.5A 0.5V 16-18V 1.25V 1.5V FX 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(dòng)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 |
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