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参数资料
| 型号： | LM2574N-ADJ |
| 厂商： | MOTOROLA INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 23/24页 |
| 文件大小： | 396K |
| 代理商： | LM2574N-ADJ |
LM2574
8
MOTOROLA ANALOG IC DEVICE DATA
Figure 16. Test Circuit and Layout Guidelines
D1
1N5819
L1
330
H
Output
7
1
Feedback
Cout
220
F
Cin
22
F
LM2574
Fixed Output
1
3
4ON/OFF
Pwr
Gnd
Vin
Load
Vout
D1
1N5819
L1
330
H
Output
7
1
Feedback
Cout
220
F
Cin
22
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
V
ref
–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
4ON/OFF
Pwr
Gnd
2
Sig
Gnd
7.0 V – 40 V
Unregulated
DC Input
Cin –22 F, 60 V, Aluminium Electrolytic
Cout – 220 F, 25 V, Aluminium Electrolytic
D1
–
Schottky, 1N5819
L1
–
330
H, (For 5.0 Vin, 3.3 Vout, use 100 H)
R1
–
2.0 k, 0.1%
R2
–
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2574N-ADJ NOPB | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 4V to 40V 8-Pin PDIP |
| LM2574N-ADJ | 制造商:Texas Instruments 功能描述:SWITCHING REG 0.5A ADJ 2574 DIP8 |
| LM2574N-ADJ/NOPB | 功能描述:直流/直流开关转换器 0.5A STEP-DOWN VLTG REG RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2574N-ADJG | 功能描述:直流/直流开关调节器 500mA Adj. Step Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2574N-ADJG | 制造商:ON Semiconductor 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
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