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LM2671 Datasheet(PDF) 23 Page - Texas Instruments

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Part No. LM2671
Description  LM2671 SIMPLE SWITCHER짰 Power Converter High Efficiency 500-mA Step-Down Voltage Regulator With Features
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2671 Datasheet(HTML) 23 Page - Texas Instruments

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23
LM2671
www.ti.com
SNVS008L – SEPTEMBER 1998 – REVISED JUNE 2016
Product Folder Links: LM2671
Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
(1)
The SC series of Os-Con capacitors (others are SA series)
(2)
The voltage ratings of the surface mount tantalum chip and Os-Con capacitors are too low to work at these voltages.
Table 9. Output Capacitor Selection Table
OUTPUT CAPACITOR
CAP.
REF.
DESG.
#
SURFACE MOUNT
THROUGH HOLE
SPRAGUE 594D
SERIES (μF/V)
AVX TPS SERIES
(μF/V)
SANYO OS-CON SA
SERIES (μF/V)
SANYO MV-GX
SERIES (μF/V)
NICHICON PL
SERIES (μF/V)
PANASONIC HFQ
SERIES (μF/V)
C1
120/6.3
100/10
100/10
220/35
220/35
220/35
C2
120/6.3
100/10
100/10
150/35
150/35
150/35
C3
120/6.3
100/10
100/35
120/35
120/35
120/35
C4
68/10
100/10
68/10
220/35
220/35
220/35
C5
100/16
100/10
100/10
150/35
150/35
150/35
C6
100/16
100/10
100/10
120/35
120/35
120/35
C7
68/10
100/10
68/10
150/35
150/35
150/35
C8
100/16
100/10
100/10
330/35
330/35
330/35
C9
100/16
100/16
100/16
330/35
330/35
330/35
C10
100/16
100/16
68/16
220/35
220/35
220/35
C11
100/16
100/16
68/16
150/35
150/35
150/35
C12
100/16
100/16
68/16
120/35
120/35
120/35
C13
100/16
100/16
100/16
120/35
120/35
120/35
C14
100/16
100/16
100/16
220/35
220/35
220/35
C15
47/20
68/20
47/20
220/35
220/35
220/35
C16
47/20
68/20
47/20
150/35
150/35
150/35
C17
47/20
68/20
47/20
120/35
120/35
120/35
C18
68/25
(2×) 33/25
47/25 (1)
220/35
220/35
220/35
C19
33/25
33/25
33/25 (1)
150/35
150/35
150/35
C20
33/25
33/25
33/25 (1)
120/35
120/35
120/35
C21
33/35
(2×) 22/25
(2)
150/35
150/35
150/35
C22
33/35
22/35
(2)
120/35
120/35
120/35
C23
(2)
(2)
(2)
220/50
100/50
120/50
C24
(2)
(2)
(2)
150/50
100/50
120/50
C25
(2)
(2)
(2)
150/50
82/50
82/50
9.2.2.2.4
Catch Diode Selection (D1)
1. In normal operation, the average current of the catch diode is the load current times the catch diode duty
cycle, 1-D (D is the switch duty cycle, which is approximately VOUT/VIN). The largest value of the catch diode
average current occurs at the maximum input voltage (minimum D). For normal operation, the catch diode
current rating must be at least 1.3 times greater than its maximum average current. However, if the power
supply design must withstand a continuous output short, the diode must have a current rating greater than
the maximum current limit of the LM2671. The most stressful condition for this diode is a shorted output
condition.
Refer to the table shown in Table 4. Schottky diodes provide the best performance, and in this example a 1-
A, 40-V Schottky diode would be a good choice. If the circuit must withstand a continuous shorted output, a
higher current (at least 1.2 A) Schottky diode is recommended.
2. The reverse voltage rating of the diode must be at least 1.25 times the maximum input voltage.
3. Because of their fast switching speed and low forward voltage drop, Schottky diodes provide the best
performance and efficiency. The Schottky diode must be placed close to the LM2671 using short leads and
short printed-circuit traces.


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