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参数资料
型号： LM2595J-5.0-QML
厂商： NATIONAL SEMICONDUCTOR CORP
元件分类： 稳压器
英文描述： 2.6 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, CDIP16
封装： CERAMIC, DIP-16
文件页数： 3/33页
文件大小： 1016K
代理商： LM2595J-5.0-QML
LM2595 Series Buck Regulator Design Procedure (Fixed Output) (Continued)
LM2595 Series Buck Regulator Design Procedure (Adjustable Output)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
Given:
V
OUT = Regulated Output Voltage
V
IN(max) = Maximum Input Voltage
I
LOAD(max) = Maximum Load Current
F = Switching Frequency
(Fixed at a nominal 150 kHz).
Given:
V
OUT = 20V
V
IN(max) = 28V
I
LOAD(max) = 1A
F = Switching Frequency
(Fixed at a nominal 150 kHz).
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
Figure 1)
Use the following formula to select the appropriate resistor
values.
Select a value for R
1 between 240 and 1.5 k. The lower
resistor values minimize noise pickup in the sensitive feed-
back pin. (For the lowest temperature coefficient and the best
stability with time, use 1% metal film resistors.)
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
Figure 1)
Select R
1 to be 1 k,1%. Solve for R2.
R
2 = 1k (16.26 1) = 15.26k, closest 1% value is 15.4 k.
R
2 = 15.4 k.
Procedure continued on next page.
Example continued on next page.
Conditions
Inductor
Output Capacitor
Through Hole Electrolytic
Surface Mount Tantalum
Output
Load
Max Input
Inductance
Inductor
Panasonic
Nichicon
AVX TPS
Sprague
Voltage
Current
Voltage
(H)
(#)
HFQ Series
PL Series
Series
595D Series
(V)
(A)
(V)
(F/V)
3.3
1
5
22
L24
330/16
220/10
330/10
7
33
L23
270/25
220/10
270/10
10
47
L31
220/25
220/35
220/10
40
68
L30
180/35
220/35
220/10
180/10
6
47
L13
220/25
220/16
220/10
0.5
10
68
L21
150/35
150/25
100/16
150/16
40
100
L20
150/35
82/35
100/16
100/20
5
1
8
33
L28
330/16
220/10
270/10
10
47
L31
220/25
220/10
15
68
L30
180/35
220/10
150/16
40
100
L29
180/35
120/35
100/16
120/16
9
68
L21
180/16
220/10
150/16
0.5
20
150
L19
120/25
1200/25
100/16
100/20
40
150
L19
100/25
68/20
68/25
12
1
15
47
L31
220/25
68/20
120/20
18
68
L30
180/35
120/25
68/20
120/20
30
150
L36
82/25
68/20
100/20
40
220
L35
82/25
68/20
68/25
15
68
L21
180/25
68/20
120/20
0.5
20
150
L19
82/25
68/20
100/20
40
330
L26
56/25
68/20
68/25
FIGURE 2. LM2595 Fixed Voltage Quick Design Component Selection Table
www.national.com
11
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相关代理商/技术参数
参数描述
LM2595S12 制造商:Texas Instruments 功能描述:SWITCHING REG, 1A 12V, SMD, 2595 制造商:Texas Instruments 功能描述:SWITCHING REG, 1A 12V, SMD, 2595; Primary Input Voltage:24V; No. of Outputs:1; Output Voltage:12V; Output Current:1A; Voltage Regulator Case Style:TO-263; No. of Pins:5; Operating Temperature Min:-25C; Operating Temperature ;RoHS Compliant: Yes
LM2595S-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
LM2595S12 制造商:Texas Instruments 功能描述:IC SWITCHING REG 1A 12V SMD 2595
LM2595S-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
LM2595S-3.3 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
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