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| 型号： | LM2575D2T-5R4 |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1A D2PAK |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 800 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.75 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 52kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | D2PAK-5 |
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LM2575, NCV2575
Procedure (Fixed Output Voltage Version) In order to simplify the switching regulator design, a step ? by ? step design
procedure and example is provided.
Procedure
Given Parameters:
V out = Regulated Output Voltage (3.3 V, 5.0 V, 12 V or 15 V)
V in(max) = Maximum DC Input Voltage
I Load(max) = Maximum Load Current
1. Controller IC Selection
According to the required input voltage, output voltage and
current, select the appropriate type of the controller IC output
voltage version.
2. Input Capacitor Selection (C in )
To prevent large voltage transients from appearing at the input
and for stable operation of the converter, an aluminium or
tantalum electrolytic bypass capacitor is needed between the
input pin +V in and ground pin GND. This capacitor should be
located close to the IC using short leads. This capacitor should
have a low ESR (Equivalent Series Resistance) value.
3. Catch Diode Selection (D1)
A. Since the diode maximum peak current exceeds the
regulator maximum load current the catch diode current
rating must be at least 1.2 times greater than the maximum
load current. For a robust design the diode should have a
current rating equal to the maximum current limit of the
LM2575 to be able to withstand a continuous output short
B. The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
4. Inductor Selection (L1)
A. According to the required working conditions, select the
correct inductor value using the selection guide from
B. From the appropriate inductor selection guide, identify the
inductance region intersected by the Maximum Input
Voltage line and the Maximum Load Current line. Each
region is identified by an inductance value and an inductor
code.
C. Select an appropriate inductor from the several different
manufacturers part numbers listed in Table 1 or Table 2.
When using Table 2 for selecting the right inductor the
designer must realize that the inductor current rating must
be higher than the maximum peak current flowing through
the inductor. This maximum peak current can be calculated
Example
Given Parameters:
V out = 5.0 V
V in(max) = 20 V
I Load(max) = 0.8 A
1. Controller IC Selection
According to the required input voltage, output voltage,
current polarity and current value, use the LM2575 ? 5
controller IC
2. Input Capacitor Selection (C in )
A 47 m F, 25 V aluminium electrolytic capacitor located near
to the input and ground pins provides sufficient bypassing.
3. Catch Diode Selection (D1)
A. For this example the current rating of the diode is 1.0 A.
B. Use a 30 V 1N5818 Schottky diode, or any of the
suggested fast recovery diodes shown in the Table 4.
4. Inductor Selection (L1)
A. Use the inductor selection guide shown in Figures 17
to 21.
B. From the selection guide, the inductance area intersected
by the 20 V line and 0.8 A line is L330.
C. Inductor value required is 330 m H. From the Table 1 or
Table 2 , choose an inductor from any of the listed
manufacturers.
p(max)
as follows :
I
+ I
Load(max)
)
V inV out t on
2L
where t on is the “on” time of the power switch and
in
ton +
V out
V
x
1
fosc
For additional information about the inductor, see the
inductor section in the “External Components” section of
this data sheet.
http://onsemi.com
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2575D2T-5R4G | 功能描述:直流/直流开关调节器 5V 1A 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 |
| LM2575D2T-ADJ | 功能描述:直流/直流开关调节器 1A 1.23-37V ADJ Buck 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 |
| LM2575D2T-ADJG | 功能描述:直流/直流开关调节器 1A 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 |
| LM2575D2T-ADJR4 | 功能描述:直流/直流开关调节器 1A 1.23-37V ADJ Buck 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 |
| LM2575D2T-ADJR4G | 功能描述:直流/直流开关调节器 1A 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 |
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