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LM2852 Folha de dados(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Nome de Peças LM2852
Descrição Electrónicos  2A 500/1500kHz Synchronous SIMPLE SWITCHER짰 Buck Regulator
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2852 Folha de dados(HTML) 10 Page - National Semiconductor (TI)

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Applications Information (Continued)
falls to a low voltage. During this time, the soft-start voltage
is forced to track the output so that once the short is re-
moved, the LM2852 can restart gracefully from whatever
voltage the output reached during the short circuit event. The
range of soft-start capacitors is therefore restricted to values
1nF to 50nF.
COMPENSATION
The LM2852 provides a highly integrated solution to power
supply design. The compensation of the LM2852, which is
type-three, is included on-chip. The benefit to integrated
compensation is straightforward, simple power supply de-
sign. Since the output filter capacitor and inductor values
impact the compensation of the control loop, the range of L,
C and C
ESR values is restricted in order to ensure stability.
OUTPUT FILTER VALUES
Table 1 details the recommended inductor and capacitor
ranges for the LM2852 that are suggested for various typical
output voltages. Values slightly different than those recom-
mended may be used, however the phase margin of the
power supply may be degraded.
TABLE 1. Output Filter Values
Frequency
Option
V
OUT (V)
PVIN (V)
L (µH)
C (µF)
C
ESR (m
Ω)
Min
Max
Min
Max
Min
Max
LM2852Y
(500kHz)
0.8
3.3
10
15
100
220
70
200
0.8
5.0
10
15
100
120
70
200
1.0
3.3
10
15
100
180
70
200
1.0
5.0
10
15
100
180
70
200
1.2
3.3
10
15
100
180
70
200
1.2
5.0
15
22
100
120
70
200
1.5
3.3
10
15
100
120
70
200
1.5
5.0
22
22
100
120
70
200
1.8
3.3
10
15
100
120
100
200
1.8
5.0
22
33
100
120
100
200
2.5
3.3
6.8
10
68
120
95
275
2.5
5.0
15
22
68
120
95
275
3.3
5.0
15
22
68
100
100
275
LM2852X
(1500kHz)
0.8
3.3
110
The 1500kHz version is
designed for ceramic output
capacitors which typically
have very low ESR (<10m
Ω.)
0.8
5.0
1.0
3.3
1.0
5.0
1.2
3.3
1.2
5.0
1.5
3.3
1.5
5.0
1.8
3.3
1.8
5.0
2.5
3.3
2.5
5.0
3.3
5.0
www.national.com
10


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