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PDF LM2595 Data sheet ( Hoja de datos )
| Número de pieza | LM2595 | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2595 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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LM2595
1.0 A, Step-Down Switching
Regulator
The LM2595 regulator is monolithic integrated circuit ideally suited
for easy and convenient design of a step−down switching regulator
(buck converter). It is capable of driving a 1.0 A load with excellent
line and load regulation. This device is available in adjustable output
version and it is internally compensated to minimize the number of
external components to simplify the power supply design.
Since LM2595 converter is a switch −mode power supply , its
efficiency is significantly higher in comparison with popular
three−terminal linear regulators, especially with higher input voltages.
The LM2595 operates at a switching frequency of 150 kHz thus
allowing smaller sized filter components than what would be needed
with lower frequency switching regulators. A vailable in a standard
5−lead TO−220 package with several different lead bend options, and
D2PAK surface mount package.
The other features include a guaranteed $4% tolerance on output
voltage within specified input voltages and output load conditions, and
$15% on the oscillator frequency . External shutdown is included,
featuring 50 mA (typical) standby current. Self protection features
include switch cycle−by−cycle current limit for the output switch, as
well as thermal shutdown for complete protection under fault
conditions.
Features
• Adjustable Output Voltage Range 1.23 V − 37 V
• Guaranteed 1.0 A Output Load Current
• Wide Input Voltage Range up to 40 V
• 150 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability
• Low Power Standby Mode, typ 50 mA
• Thermal Shutdown and Current Limit Protection
• Internal Loop Compensation
• Moisture Sensitivity Level (MSL) Equals 1
• Pb−Free Packages are Available
Applications
• Simple High−Efficiency Step−Down (Buck) Regulator
• Efficient Pre−Regulator for Linear Regulators
• On−Card Switching Regulators
• Positive to Negative Converter (Buck−Boost)
• Negative Step−Up Converters
• Power Supply for Battery Chargers
http://onsemi.com
1
5
TO−220
TV SUFFIX
CASE 314B
Heatsink surface connected to Pin 3
1
5
TO−220
T SUFFIX
CASE 314D
Pin 1. Output
2. Vin
3. Ground
4. Feedback
5. ON/OFF
1
5
D2PAK
D2T SUFFIX
CASE 936A
Heatsink surface (shown as terminal 6 in
case outline drawing) is connected to Pin 3
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 23 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
February, 2009 − Rev. 2
1
Publication Order Number:
LM2595/D
http://www.Datasheet4U.com
1 page  
LM2595
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 16)
1.0
0.8 Vin = 20 V
0.6
ILoad = 200 mA
Normalized at TJ = 25°C
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
−50
−25 0
25 50
75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 3. Normalized Output Voltage
125
1.4
1.2
ILoad = 200 mA
TJ = 25°C
1.0
0.8
0.6 Vout = 5 V
0.4
0.2
0
−0.2
−0.4
−0.6
0 5.0 10 15 20
25 30
Vin, INPUT VOLTAGE (V)
Figure 4. Line Regulation
35 40
1.5
1.0 ILoad = 1 A
0.5
0
−0.5
−50
ILoad = 200 mA
L = 68 mH
R_ind = 30 mW
−25 0 25 60 75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Dropout Voltage
3.0
Vin = 12 V
2.0
1.0
0.0−50 −30 −10 10 30 50 70 90 110 130
TJ, JUNCTION TEMPERATURE (°C)
Figure 6. Current Limit
12
Vout = 5 V
11 Measured at GND Pin
10 TJ = 25°C
9 ILoad = 1.0 A
8
7
ILoad = 200 mA
6
5
4
0 5 10 15 20 25 30 35 40
Vin, INPUT VOLTAGE (V)
Figure 7. Quiescent Current
160
VON/OFF = 5.0 V
140
120
100
80
60 Vin = 40 V
40 Vin = 12 V
20
0
−50 −25
0
25 60
75 100
TJ, JUNCTION TEMPERATURE (°C)
Figure 8. Standby Quiescent Current
125
http://onsemi.com
5
5 Page 
LM2595
LM2595 Series Buck Regulator Design Procedures (continued)
Table 1. RECOMMENDED VALUES OF THE OUTPUT CAPACITOR AND FEEDFORWARD CAPACITOR
(Iload = 1.0 A)
Nichicon Pm Capacitors
Vin (V)
40
1000/60/10
1000/60/10
Capacity/ESR/Voltage Range (mF/mW/V)
1000/60/10 470/120/10 220/110/25 180/290/25
180/290/25
82/190/35
35 1000/60/10 1000/60/10 1000/60/10 220/110/25 180/140/25 120/200/25 120/200/25 82/190/35
26 1000/60/10 470/120/10 220/110/25 220/110/25 180/140/25 120/200/25 120/200/25 82/190/35
20 1000/60/10 470/120/10 220/110/25 220/110/25 180/140/25 120/200/25 120/200/25
18 1000/60/10 470/120/10 220/110/25 220/110/25 180/140/25 120/200/25 120/200/25
12 470/120/10 470/120/10 220/110/25 220/110/25 180/140/25
10 470/120/10 470/120/10 220/110/25 220/110/25
Vout
2
3
4
6
9 12 15 24
Cff (nF)
10
4.7
4.7
4.7
1.5
1.5
1
0.6
82/190/35
82/190/35
28
0.6
MAXIMUM LOAD CURRENT (A)
Figure 19. Inductor Value Selection Guides (For Continuous Mode Operation)
http://onsemi.com
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet LM2595.PDF ] | |
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