LM2596-12 Просмотр технического описания (PDF) - First Components International
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LM2596-12
First Components International
LM2596-12 Datasheet PDF : 14 Pages
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LM2596 Simple switcher Power Converter 150kHz
3A Step-Down Voltage Regulator
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
(especially the 100 kHz ESR) closely match the types
listed in the table. Refer to the capacitor
manufacturers data sheet for this information.
4. Feedforward Capacitor (CFF ) (See Figure 1)
For output voltages greater than approximately 10V, an
additional capacitor is required. The compensation
capacitor is typically between 100 pF and 33 nF, and is
wired in parallel with the output voltage setting resistor,
R2. It provides additional stability for high output voltages,
low input-output voltages, and/or very low ESR output
capacitors, such as solid tantalum capacitors.
=1
CFF 31 ×103 × R 2
4. Feedforward Capacitor (CFF )
The table shown in Figure 3 contains feed forward
capacitor values for various output voltages. In this
example, a 560 pF capacitor is needed.
This capacitor type can be ceramic, plastic, silver mica,
etc. (B ecause of the unstable characteristics of ceramic
capacitors made with Z5U material, they are not
recommended.)
LM2596 SERIES BUCK REGULATOR DESING PROCEDURE (ADJUSTABLE OUTPUT)
Output
Voltage
(V)
Through Hole Output Capacitor
Panasonic HFQ Nichicon PL
Series
Series
(µF/V)
(µF/V)
Feedforward
capacitor
Surface Mount Output Capacitor
AVX TPS
Series
(µF/V)
Sprague 595D
Series
(µF/V)
Feedforward
Capacitor
2
820/35
820/35
33 nF
330/6.3
470/4
33 nF
4
560/35
470/35
10 nF
330/6.3
390/6.3
10 nF
6
470/25
470/25
3.3 nF
220/10
330/10
3.3 nF
9
330/25
330/25
1.5 nF
100/16
180/16
1.5 nF
12
330/25
330/25
1 nF
100/16
180/16
1 nF
15
220/35
220/35
680 pF
68/20
120/20
680 pF
24
220/35
150/35
560 pF
33/25
33/25
220 pF
28
100/50
100/50
390 pF
10/35
15/50
220 pF
Figure 3. Output Capacitor and Feedforward Capacitor Selection Table
LM2596 SERIES BUCK REGULATOR DESIGN PROCEDURE
Inductor Value Selection Guides (For Continuous Mode Operation)
40V L29
20V
15V
L21
10V
L30
68µH
47µH
L31
L40
L32
8V
L22
7V
33µH
L33
L23
6V
22µH
L34
L24
40V L27
30V
25V
150µH
L36
L43
L37
20V L28
19V
18V
L29
17V
16V L21
100µH
L30
L38
L39
68µH
L31
L40
47 µH
L32
15V L22
33µH
L33
L15
L25
5V
L16
0.6 0.8 1.0 1.5
15µH
2.0 2.5 3.0
14V
0.6
L23
L24
22 µH
L34
15µH
0.8 1.0 1.5 2.0 2.5 3.0
MAXIMUM LOAD CURRENT (A)
Figure 4. LM2596-3.3
MAXIMUM LOAD CURRENT (A)
Figure 6. LM2596-12
11
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