參數(shù)資料
型號(hào)： LM2574HV
廠商： National Semiconductor Corporation
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 397K
代理商： LM2574HV
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
6.12 k
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(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2574HVM-12 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
LM2574HVM-12/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
LM2574HVM-12/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter IC
LM2574HVM-15 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
LM2574HVM-15/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
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