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LM2595 Datasheet(PDF) 13 Page - Texas Instruments

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Part # LM2595
Description  SIMPLE SWITCHER짰 Power Converter 150 kHz 1A Step-Down Voltage Regulator
PDF  41 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2595 Datasheet(HTML) 13 Page - Texas Instruments

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LM2595
www.ti.com
SNVS122B – MAY 1999 – REVISED APRIL 2013
Table 2. LM2595 Fixed Voltage Quick Design Component Selection Table (continued)
Conditions
Inductor
Output Capacitor
Through Hole Electrolytic
Surface Mount Tantalum
Output
Load
Max Input
Inductance
Inductor
Panasonic
Nichicon
AVX TPS
Sprague
Voltage
Current
Voltage
(
μH)
(#)
HFQ Series
PL Series
Series
595D Series
(V)
(A)
(V)
(
μF/V)
(
μF/V)
(
μF/V)
(
μF/V)
8
33
L28
330/16
330/16
220/10
270/10
10
47
L31
220/25
220/25
220/10
220/10
1
15
68
L30
180/35
180/35
220/10
150/16
5
40
100
L29
180/35
120/35
100/16
120/16
9
68
L21
180/16
180/16
220/10
150/16
0.5
20
150
L19
120/25
1200/25
100/16
100/20
40
150
L19
100/25
100/25
68/20
68/25
15
47
L31
220/25
220/25
68/20
120/20
18
68
L30
180/35
120/25
68/20
120/20
1
30
150
L36
82/25
82/25
68/20
100/20
12
40
220
L35
82/25
82/25
68/20
68/25
15
68
L21
180/25
180/25
68/20
120/20
0.5
20
150
L19
82/25
82/25
68/20
100/20
40
330
L26
56/25
56/25
68/20
68/25
Table 3. LM2595 Series Buck Regulator Design Procedure (Adjustable Output)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
Given:
Given:
VOUT = Regulated Output Voltage
VOUT = 20V
VIN(max) = Maximum Input Voltage
VIN(max) = 28V
ILOAD(max) = Maximum Load Current
ILOAD(max) = 1A
F = Switching Frequency (Fixed at a nominal 150 kHz).
F = Switching Frequency (Fixed at a nominal 150 kHz).
1. Programming Output Voltage (Selecting R1 and R2, as shown in 1. Programming Output Voltage (Selecting R1 and R2, as shown in
Figure 21)
Figure 21)
Use the following formula to select the appropriate resistor values.
Select R1 to be 1 kΩ, 1%. Solve for R2.
(1)
(3)
Select a value for R1 between 240Ω and 1.5 kΩ. The lower resistor R2 = 1k (16.26 − 1) = 15.26k, closest 1% value is 15.4 kΩ.
values minimize noise pickup in the sensitive feedback pin. (For the
R2 = 15.4 kΩ.
lowest temperature coefficient and the best stability with time, use
1% metal film resistors.)
(2)
Copyright © 1999–2013, Texas Instruments Incorporated
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