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參數(shù)資料
| 型號： | LM2574DW-ADJ |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | EASY SWITCHER 0.5 A STEP-DOWN VOLTAGE REGULATOR |
| 中文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大小： | 397K |
| 代理商： | LM2574DW-ADJ |
LM2574
8
MOTOROLA ANALOG IC DEVICE DATA
Figure 16. Test Circuit and Layout Guidelines
D1
1N5819
L1
330
μ
H
Output
7
1
Feedback
Cout
220
μ
F
Cin
22
μ
F
LM2574
Fixed Output
1
3
4
ON/OFF
Pwr
Gnd
Vin
Load
Vout
D1
1N5819
L1
330
μ
H
Output
7
1
Feedback
Cout
220
μ
F
Cin
22
μ
F
LM2574
Adjustable
1
Vin
Load
Vout
5.0 V
Fixed Output Voltage Versions
Adjustable Output Voltage Versions
Vout
Vref
1.0
R2
R1
R2
R1
Vout
Vref
– 1.0
Where Vref = 1.23 V, R1
between 1.0 k
and 5.0 k
R2
R1
2.0 k
7.0 – 40 V
Unregulated
DC Input
2
Sig
Gnd
3
4
ON/OFF
Pwr
Gnd
2
Sig
Gnd
7.0 V – 40 V
Unregulated
DC Input
Cin
Cout–
D1
L1
R1
R2
–
22
μ
F, 60 V, Aluminium Electrolytic
220
μ
F, 25 V, Aluminium Electrolytic
Schottky, 1N5819
330
μ
H, (For 5.0 Vin, 3.3 Vout, use 100
μ
H)
2.0 k, 0.1%
6.12 k, 0.1%
–
–
–
–
PCB LAYOUT GUIDELINES
As in any switching regulator, the layout of the printed
circuit board is very important. Rapidly switching currents
associated with wiring inductance, stray capacitance and
parasitic inductance of the printed circuit board traces can
generate voltage transients which can generate
electromagnetic interferences (EMI) and affect the desired
operation. As indicated in the Figure 16, to minimize
inductance and ground loops, the length of the leads
indicated by heavy lines should be kept as short as possible.
For best results, single–point grounding (as indicated) or
ground plane construction should be used.
On the other hand, the PCB area connected to the Pin 7
(emitter of the internal switch) of the LM2574 should be kept
to a minimum in order to minimize coupling to sensitive
circuitry.
Another sensitive part of the circuit is the feedback. It is
important to keep the sensitive feedback wiring short. To
assure this, physically locate the programming resistors near
to the regulator, when using the adjustable version of the
LM2574 regulator.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM2574DW-ADJR2 | 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| 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(shù)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(shù)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(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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