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参数资料
| 型号： | LM2576TV-ADJ |
| 厂商： | MOTOROLA INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封装： | TO-220, 5 PIN |
| 文件页数： | 27/28页 |
| 文件大小： | 415K |
| 代理商： | LM2576TV-ADJ |
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LM2576
8
MOTOROLA ANALOG IC DEVICE DATA
Figure 15. Typical Test Circuit
D1
MBR360
L1
100
H
Output
2
4
Feedback
Cout
1000
F
Cin
100
F
LM2576
Fixed Output
1
5
3ON/OFF
Gnd
Vin
Load
Vout
D1
MBR360
L1
100
H
Output
2
4
Feedback
Cout
1000
F
Cin
100
F
LM2576
Adjustable
1
5
3ON/OFF
Gnd
Vin
Load
Vout
5,000 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
R1
Cin – 100 F, 75 V, Aluminium Electrolytic
Cout – 1000 F, 25 V, Aluminium Electrolytic
D1
–
Schottky, MBR360
L1
–
100
H, Pulse Eng. PE–92108
R1
–
2.0 k, 0.1%
R2
–
6.12 k, 0.1%
7.0 V – 40 V
Unregulated
DC Input
7.0 V – 40 V
Unregulated
DC Input
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 15, 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 2
(emitter of the internal switch) of the LM2576 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
LM2576 regulator.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2576TV-ADJG | 功能描述:直流/直流开关调节器 3A 1.23-37V ADJ Buck PWM 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 |
| LM2576TV-AJD | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:EASY SWITCHERE⑩ 3.0 A STEP-DOWN VOLTAGE REGULATOR |
| LM2576WT | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) 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 |
| LM2576WT L3 | 制造商:Micrel Inc 功能描述:Micrel LM2576WT L3 DC to DC Conversion |
| LM2576WU | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) 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 |
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