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Example Circuit Designs
Table 4. Component Values for an 8-12V in, 5V/3A Out LM2673S-5.0 Buck Converter (continued)
Component
Value
Suggested Part Number
CB
0.01 µF/50V
Vishay VJ1206Y103MXXA
D1
3A/60V Schottky (450 mV at 3A)
Motorola MBRD360
R3*
7.15 k
Ω
Vishay CRCW12067151J
(5.19A current limit)
L1
22 µH (L41)
SUMIDA ELECTRIC CO. CDRH127-220
CSS
3.3 nF/100V (softstart)
Vishay VJ1206Y33ZJXBAB
COUTX
0.47 µF
Vishay VJ1210U474ZXAA
COUT
2 x 18 0µF/16V
Vishay 594D187X0016R2T
Figure 5
below shows the 5V/3A design circuit. This solution is available as evaluation board LM2673S-
5_EVAL.
Figure 6
through
Figure 9
show the output waveforms for output voltage with 500 mA load, output voltage
with 1A load, output ripple with 1A load, output voltage with 3A load, output ripple with 3A load, output
response to 1A transient load and output response to 3A transient load respectively.
Figure 5. 5V/3A Design Circuit
A: OUTPUT VOLTAGE: V
OUT
; 2V/DIV
B: LOAD CURRENT: I
LOAD
= 500 mA; 500 mA/DIV
Figure 6. Output Voltage with 500 mA Load
5
SNVA013D – December 2000 – Revised April 2013
AN-1135 LM267X 3A, 5A Evaluation Boards
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