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参数资料
| 型号： | LM2575S-ADJTR |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封装： | TO-263, 5 PIN |
| 文件页数： | 4/19页 |
| 文件大小： | 441K |
| 代理商： | LM2575S-ADJTR |
12
2001 Semtech Corp.
www.semtech.com
LM2575 & LM2576
POWER MANAGEMENT
The above component selections will be adequate for
most applications for output currents from 250mA to 3A
(LM2576) or 150mA to 1A (LM2575). Applications with
V
OUT below 5V or above 24V may require component
adjustment for maximum performance; please contact
factory for application assistance.
1. Device Selection. Select an appropriate device from
the Ordering Information guide based upon voltage
option and package.
2. Thermal Conditions. Most applications will not require
a heatsink for the TO-220 package. Approximate power
dissipation is:
IN
O
IN
SAT
O
V
02
.
0
V
I
V
P
+
=
3. Catch Diode. If the output must be capable of a
sustained short, the I
F rating must be above 3A for the
LM2575 and 7A for the LM2576. The use of an ultra
fast diode with soft recovery characteristics or a Schottky
will be adequate. The major impact on the selection of a
Schottky versus an ultra fast diode is efficiency. Schottkys
will provide approximately 4% to 5% improvement for
V
OUTS below 12V, whereas above 12V the difference will
become less significant. Breakdown rating must be in
excess of V
IN for margin.
4. Input Capacitor. The value shown will be adequate for
most applications. Ripple voltage at the switching
frequency is caused by the input capacitor supplying load
current during the on time of the power switch. The use
of a low ESR switching type capacitor will minimize ripple
to an acceptable level.
5. Layout. Use short connections with a central point
ground to prevent improper operation caused by stray
inductance and ground loops.
6. Output Capacitor. Ripple voltage on V
OUT is directly
related to the value of C
OUT and the internal resistance
ESR of C
OUT. Output noise can be lowered by increasing
C
OUT or by selecting a capacitor with a lower ESR. ESR
must be a minimum of 0.03W for the LM2576 or 0.07W
for the LM2575 to maintain stability, otherwise raise the
value of C
OUT.
Applications Information - Buck Mode
5
7
5
2
M
L6
7
5
2
M
L
1
H
0
3
3H
0
1
D
1
A
3A
7
C
N
I
F
8
6F
0
2
1
C
T
U
O
F
0
3
3F
0
,
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2575SX-12 | 功能描述:直流/直流开关转换器 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 |
| LM2575SX-12 NOPB | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 4V to 40V 6-Pin(5+Tab) TO-263 T/R |
| LM2575SX-12/NOPB | 功能描述:直流/直流开关转换器 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 |
| LM2575SX-15 | 功能描述:直流/直流开关转换器 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 |
| LM2575SX-15 NOPB | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 4V to 40V 6-Pin(5+Tab) TO-263 T/R |
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