參數(shù)資料
型號(hào)： LM2574
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(yè)數(shù)： 8/26頁(yè)
文件大?。?/td> 295K
代理商： LM2574
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.
相關(guān)PDF資料
PDF描述
LM2575-33IKTGR 1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR
LM2575T-5 Precision Chopper-Stabilized Advanced LinCMOS(TM) Operational Amplifier 8-SOIC -55 to 125
LM2575T-12 EASY SWITCHERE⑩ 1.0 A STEP-DOWN VOLTAGE REGULATOR
LM2575D2T-15 EASY SWITCHERE⑩ 1.0 A STEP-DOWN VOLTAGE REGULATOR
LM2575D2T-ADJ EASY SWITCHERE⑩ 1.0 A STEP-DOWN VOLTAGE REGULATOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2574 3.3V WAF 制造商:Motorola Inc 功能描述:
LM2574/D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Easy Switcher? 0.5A Step-Down Voltage Regulator
LM2574_05 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:52kHz Simple 0.5A Buck Regulator
LM2574_06 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator
LM2574-12 制造商:Texas Instruments 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*