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參數資料
| 型號： | LM2574DW-ADJR2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SO-16 |
| 文件頁數： | 13/24頁 |
| 文件大?。?/td> | 396K |
| 代理商： | LM2574DW-ADJR2 |
LM2574
20
MOTOROLA ANALOG IC DEVICE DATA
R1
47 k
LM2574–XX
5
2
and
4
3
Gnds
Pins
ON/OFF
R2
47 k
+Vin
C1
0.1
F
Cin
22
F
NOTE: This picture does not show the complete circuit.
Figure 32. Delayed Startup Circuitry
Undervoltage Lockout
Some applications require the regulator to remain off until
the input voltage reaches a certain threshold level. Figure 33
shows an undervoltage lockout circuit applied to a buck
regulator. A version of this circuit for buck–boost converter is
shown in Figure 34. Resistor R3 pulls the ON/OFF pin high
and keeps the regulator off until the input voltage reaches a
predetermined threshold level, which is determined by the
following expression:
V
th [
V
Z1 )
1.0
) R2
R1
V
BE
(Q1)
R1
10 k
Z1
1N5242B
R2
10 k
Q1
2N3904
R3
47 k
Cin
22
F
LM2574–XX
5
2
and
4
3
Gnds
Pins
ON/OFF
+Vin
NOTE: This picture does not show the complete circuit.
Figure 33. Undervoltage Lockout Circuit for
Buck Converter
R2
15 k
Z1
1N5242
R1
15 k
Q1
2N3904
R3
68 k
Cin
22
F
LM2574–XX
5
2
and
4
3
Gnds
Pins
ON/OFF
+Vin
–Vout
NOTE: This picture does not show the complete circuit (see Figure 27).
Figure 34. Undervoltage Lockout Circuit for
Buck–Boost Converter
Adjustable Output, Low–Ripple Power Supply
A 0.5 A output current capability power supply that
features an adjustable output voltage is shown in Figure 35.
This regulator delivers 0.5 A into 1.2 to 35 V output. The
input voltage ranges from roughly 3.0 to 40 V. In order to
achieve a 10 or more times reduction of output ripple, an
additional L–C filter is included in this circuit.
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| LM2575-33IKTTR | 4 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| LM2575-12IKTT | 4 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2574DW-ADJR2G | 功能描述:直流/直流開關調節(jié)器 500mA Adj. Step Down 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2574HV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述: |
| LM2574HVM-12 | 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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2574HVM-12/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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2574HVM-12/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
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