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| 型号： | LM2575HVS-3.3EP |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封装： | TO-263, 5 PIN |
| 文件页数： | 4/26页 |
| 文件大小： | 1069K |
| 代理商： | LM2575HVS-3.3EP |
LM2575EP Series Buck Regulator Design Procedure
PROCEDURE (Fixed Output Voltage Versions)
EXAMPLE (Fixed Output Voltage Versions)
Given: V
OUT = Regulated Output Voltage (3.3V, 5V, 12V, or
15V) V
IN(Max) = Maximum Input Voltage ILOAD(Max) =
Maximum Load Current
Given: V
OUT =5VVIN(Max) = 20V ILOAD(Max) = 0.8A
1. Inductor Selection (L1) A. Select the correct Inductor
value selection guide from Figures 3, 4, 5, 6 (Output
voltages of 3.3V, 5V, 12V or 15V respectively). For other
output voltages, see the design procedure for the adjustable
version. B. From the inductor value selection guide, identify
the inductance region intersected by V
IN(Max) and
I
LOAD(Max), and note the inductor code for that region. C.
Identify the inductor value from the inductor code, and
select an appropriate inductor from the table shown in
Figure 9. Part numbers are listed for three inductor
manufacturers. The inductor chosen must be rated for
operation at the LM2575EP switching frequency (52 kHz)
and for a current rating of 1.15 x I
LOAD. For additional
inductor information, see the inductor section in the
Application Hints section of this data sheet.
1. Inductor Selection (L1) A. Use the selection guide
shown in Figure 4. B. From the selection guide, the
inductance area intersected by the 20V line and 0.8A line is
L330. C. Inductor value required is 330 H. From the table
in Figure 9, choose AIE 415-0926, Pulse Engineering
PE-52627, or RL1952.
2. Output Capacitor Selection (C
OUT)A. The value of the
output capacitor together with the inductor defines the
dominate pole-pair of the switching regulator loop. For
stable operation and an acceptable output ripple voltage,
(approximately 1% of the output voltage) a value between
100 F and 470 F is recommended. B. The capacitor’s
voltage rating should be at least 1.5 times greater than the
output voltage. For a 5V regulator, a rating of at least 8V is
appropriate, and a 10V or 15V rating is recommended.
Higher voltage electrolytic capacitors generally have lower
ESR numbers, and for this reason it may be necessary to
select a capacitor rated for a higher voltage than would
normally be needed.
2. Output Capacitor Selection (C
OUT)A. COUT = 100 F
to 470 F standard aluminum electrolytic. B. Capacitor
voltage rating = 20V.
3. Catch Diode Selection (D1) A. The catch-diode current
rating must be at least 1.2 times greater than the maximum
load current. Also, if the power supply design must
withstand a continuous output short, the diode should have
a current rating equal to the maximum current limit of the
LM2575EP. The most stressful condition for this diode is an
overload or shorted output condition. B. The reverse voltage
rating of the diode should be at least 1.25 times the
maximum input voltage.
3. Catch Diode Selection (D1) A. For this example, a 1A
current rating is adequate. B. Use a 30V 1N5818 or SR103
Schottky diode, or any of the suggested fast-recovery
diodes shown in Figure 8.
4. Input Capacitor (C
IN) An aluminum or tantalum
electrolytic bypass capacitor located close to the regulator is
needed for stable operation.
4. Input Capacitor (C
IN) A 47 F, 25V aluminum electrolytic
capacitor located near the input and ground pins provides
sufficient bypassing.
LM2575EP/LM2575HVEP
www.national.com
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2575HVS5.0 | 制造商:National Semiconductor 功能描述:Conv DC-DC Single Step Down 4V to 60V 6-Pin(5+Tab) TO-263 Rail |
| LM2575HVS-5.0 | 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 |
| LM2575HVS-5.0/NOPB | 功能描述:直流/直流开关转换器 1A 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 |
| LM2575HVS-5.0/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| LM2575HVS-5.0EP | 制造商:NSC 制造商全称:National Semiconductor 功能描述:SIMPLE SWITCHER 1A Step-Down Voltage Regulator |
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