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參數(shù)資料
| 型號： | LM25010SD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 42V, 1.0A Step-Down Switching Regulator |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, DSO10 |
| 封裝： | 4 X 4 MM, LLP-10 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 776K |
| 代理商： | LM25010SD |
Applications Information
(Continued)
Item
C1
C2
C3
C4, C6
C5
D1
L1
R1
R2
R3
R
ON
U1
Description
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Schottky Diode
Inductor
Resistor
Resistor
Resistor
Resistor
National Semi LM25010
Value
(2) 2.2 μF, 50V
22 μF, 16V
0.47 μF, 16V
0.022 μF, 16V
0.1 μF, 50V
60V, 2A
100 μH
1.0 k
1.0 k
1.5
200 k
MINIMUM LOAD CURRENT
The LM25010 requires a minimum load current of 500 μA. If
the load current falls below that level, the bootstrap capacitor
(C4) may discharge during the long off-time, and the circuit
will either shutdown, or cycle on and off at a low frequency.
If the load current is expected to drop below 500 μA in the
application, R1 and R2 should be chosen low enough in
value so they provide the minimum required current at nomi-
nal V
OUT
.
LOW OUTPUT RIPPLE CONFIGURATIONS
For applications where low output voltage ripple is required
the output can be taken directly from the low ESR output
capacitor (C2) as shown in Figure 9. However, R3 slightly
degrades the load regulation. The specific component val-
ues, and the application determine if this is suitable.
Where the circuit of Figure 9 is not suitable, the circuits of
Figure 10 or Figure 11 can be used.
20172735
FIGURE 7. Efficiency vs Load Current and V
IN
Circuit of
Figure 6
20172737
FIGURE 8. Frequency vs V
IN
Circuit of
Figure 6
20172715
FIGURE 9. Low Ripple Output
20172748
FIGURE 10. Low Output Ripple Using a Feedforward
Capacitor
L
www.national.com
14
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM25010SD/NOPB | 功能描述:直流/直流開關調節(jié)器 42V,1.0A STEP-DOWN SWITCHING REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM25010SDX | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| LM25010SDX/NOPB | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| LM25011 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit |
| LM25011A | 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 |
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