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LM2853 Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza LM2853
Descripción Electrónicos  3A 550 kHz Synchronous SIMPLE SWITCHER
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

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Applications Information (Continued)
Since it is undesirable for the power supply to start up in
current limit, a soft-start capacitor must be chosen to force
the LM2853 to start up in a more controlled fashion based on
the charging of the soft-start capacitance. In this example,
supposea3ms start time is desired. Three time constants
are required for charging the soft-start capacitor to 95% of
the final reference voltage. So in this case RC = 1 ms. The
DAC resistor, R, is 450 k
Ω so C can be calculated to be 2.2
nF. A 2.2 nF ceramic capacitor can be chosen to yield
approximatelya3ms start-up time.
SOFT-START CAPACITOR (C
SS) AND FAULT
CONDITIONS
Various fault conditions such as short circuit and UVLO of
the LM2853 activate internal circuitry designed to control the
voltage on the soft-start capacitor. For example, during a
short circuit current limit event, the output voltage typically
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 LM2853 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
1nFto50nF.
COMPENSATION
The LM2853 provides a highly integrated solution to power
supply design. The compensation of the LM2853, which is
type-three, is included on-chip. The benefit of integrated
compensation is straight-forward, simple power supply de-
sign. Since the output filter capacitor and inductor values
impact the compensation of the control loop, the range of L
O,
C
O and CESR values is restricted in order to ensure stability.
OUTPUT FILTER VALUES
Table 1 details the recommended inductor and capacitor
ranges for the LM2853 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. For best performance when
output voltage ripple is a concern, ESR values near the
minimum of the recommended range should be paired with
capacitance values near the maximum. If a minimum output
voltage ripple solution from a 5V input voltage is desired, a
6.8 µH inductor can be paired with a 220 µF (50 m
Ω)
capacitor without degraded phase margin.
TABLE 1. Recommended L
O and CO Values
V
OUT (V)
VIN (V)
L
O (µH)
C
O (µF)
C
ESR (m
Ω)
Min
Max
Min
Max
Min
Max
0.8
5
4.7
6.8
120
220
70
100
0.8
3.3
4.7
4.7
150
220
50
100
1
5
4.7
6.8
120
220
70
100
1
3.3
4.7
4.7
150
220
50
100
1.2
5
4.7
6.8
120
220
70
100
1.2
3.3
4.7
4.7
120
220
60
100
1.5
5
4.7
6.8
120
220
70
100
1.5
3.3
4.7
4.7
120
220
60
100
1.8
5
4.7
6.8
120
220
70
120
1.8
3.3
4.7
4.7
100
220
70
120
2.5
5
4.7
6.8
120
220
70
150
2.5
3.3
4.7
4.7
100
220
80
150
3.0
5
4.7
6.8
120
220
70
150
3.0
3.3
4.7
4.7
100
220
80
150
3.3
5
4.7
6.8
120
220
70
150
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