參數(shù)資料
型號(hào)： LM25011Q1MY
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO10
封裝： MSOP-10
文件頁(yè)數(shù)： 7/20頁(yè)
文件大小： 458K
代理商： LM25011Q1MY
30094634
FIGURE 5. Example Circuit
30094603
FIGURE 6. Efficiency (Circuit of Figure 5)
30094636
FIGURE 7. Frequency vs V
IN (Circuit of Figure 5)
OUTPUT RIPPLE CONTROL (LM25011A)
The LM25011A most likely will require more ripple voltage
than is generated across the RS resistor. Additional ripple can
be supplied to the FB pin, in phase with the switching wave-
form at the SW pin, for proper operation. The required ripple
can be supplied from ripple generated at V
OUT, through the
feedback resistors, as described in Option A below. Options
B and C provide for lower output ripple with one or two addi-
tional components.
The amount of additional ripple voltage needed at the FB pin
is typically in the range of 30-150mV. Higher switching fre-
quencies or higher inductor values (less ripple current) re-
quire more ripple voltage injected on FB. Insufficient ripple
voltage will result in frequency jitter. For a particular applica-
tion, add only as much ripple as needed to stabilize the
switching frequency over the required input voltage.
Option A) Lowest Cost Configuration:
In this configuration
R1 is installed in series with the output capacitor (C
OUT) as
shown in Figure 8. The inductor’s ripple current passes
through R1, generating a ripple voltage at V
OUT. The minimum
value for R1 is:
where
ΔI is the minimum ripple current amplitude, which oc-
curs at minimum Vin.
15
www.national.com
LM25011/LM25011QLM25011A/LM25011AQ
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM25011Q1MY/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM25011Q1MYX 制造商:TI 制造商全稱:Texas Instruments 功能描述:42V 2A Constant On-Time Switching Regulator With Adjustable Current Limit
LM25011Q1MYX/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM25017 制造商:TI 制造商全稱:Texas Instruments 功能描述:48V, 650mA Constant On-Time Synchronous Buck Regulator
LM25017MR/NOPB 功能描述:直流/直流開關(guān)調(diào)節(jié)器 48V 650mA Sync SD Reg w/ Intg MOSFETs RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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