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參數(shù)資料
| 型號： | NCV2574 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator(0.5A,可調(diào)輸出電壓,降壓型開關(guān)穩(wěn)壓器) |
| 中文描述： | 0.5甲，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器（0.5A的，可調(diào)輸出電壓，降壓型開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 8/26頁 |
| 文件大?。?/td> | 295K |
| 代理商： | NCV2574 |
LM2574, NCV2574
http://onsemi.com
8
Figure 16. Test Circuit and Layout Guidelines
D1
1N5819
L1
330 H
Output
7
1
Feedback
C
out
220 F
C
in
22 F
LM2574
Fixed Output
1
3
4
ON/OFF
(5)
Pwr
Gnd
(6)
V
in
Load
V
out
D1
1N5819
L1
330 H
Output
7
1
Feedback
C
out
220 F
C
in
22 F
LM2574
Adjustable
1
V
in
Load
V
out
5.0 V
Fixed Output Voltage Versions
Adjustable Output Voltage Versions
Vout
Vref
1.0
R2
R1
R2
R1
Vout
Vref
–1.0
Where V
ref
= 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
(4)
3
4
ON/OFF
(5)
Pwr
Gnd
(6)
2
Sig
Gnd
(4)
7.0 V 40 V
Unregulated
DC Input
C
in
C
out
D1
L1
R1
R2
22 F, 60 V, Aluminium Electrolytic
220 F, 25 V, Aluminium Electrolytic
Schottky, 1N5819
330 H, (For 5.0 V
in
, 3.3 V
out
, use 100 H)
2.0 k, 0.1%
6.12 k, 0.1%
NOTE: Pin numbers in ( ) are for the SO16W package.
(12)
(3)
(14)
(12)
(3)
(14)
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
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, singlepoint grounding (as indicated) or
ground plane construction should be used.
which
can
generate
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 |
|---|---|
| NCV2574DW-ADJR2 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 ASECLSW REG 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 |
| NCV2574DW-ADJR2G | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 ASECLSW REG 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 |
| NCV2574DW-ADJR2G | 制造商:ON Semiconductor 功能描述:Switching Regulator |
| NCV2575 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator |
| NCV2575D2T-12G | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 ANA 12V 1A PW SW REG 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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