LM2679-5.0EVAL National Semiconductor, LM2679-5.0EVAL Datasheet - Page 4

• Manufacturer Part Number: LM2679-5.0EVAL
• Description: EVALUATION BOARD FOR LM2679-5.0
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r

Specifications of LM2679-5.0EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Current - Output: 5A
• Voltage - Input: 14 ~ 28V
• Regulator Topology: Buck
• Frequency - Switching: 260kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM2679
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM2679-5.0EVAL; LM2679-5.0-EVAL; LM2679-5.0-EVAL

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Example Circuit Designs
Example 1: 5V/3A Converter with Surface Mount Compo-
nents.
In this example, it is desired to convert a voltage range of
between 8V and 12V, to 5VDC with load current of 3A. It is
Figure 5
is available as evaluation board LM2673S-5_EVAL.
Figure
waveforms for output voltage with 500 mA load, output volt-
6,
below shows the 5V/3A design circuit. This solution
Figure
Component
COUTX
COUT
CINX
7,
CSS
CIN
R3*
U1
CB
D1
TABLE 3. Component Values for an 8-12V in, 5V/3A Out LM2673S-5.0 Buck Converter
L1
Figure 8
and
Figure 9
3A/60V Schottky (450 mV at 3A)
3.3 nF/100V (softstart)
(5.19A current limit)
2 x 18 0µF/16V
show the output
2 x 33 µF/35V
0.01 µF/50V
22 µH (L41)
FIGURE 5. 5V/3A Design Circuit
0.47 µF
7.15 kΩ
0.47 µF
V
Value
Target Design Specifications
V
IN
IN
I
V
LOAD
T
I
OUT
CL
max.
SS
min.
4
also desired to implement the design with surface mount
components only. Softstart duration will be set to between 1
and 1.5 ms.
age 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.
5.0A (approx.)
1 to 1.5 ms
16V
8V
5V
3A
SUMIDA ELECTRIC CO. CDRH127-220
Vishay 594D336X0035R2T
Vishay VJ1206Y33ZJXBAB
Vishay 594D187X0016R2T
Vishay VJ1206Y103MXXA
Vishay VJ1210U474ZXAA
Vishay VJ1210U474ZXAA
Suggested Part Number
Vishay CRCW12067151J
National LM2673S-5.0
Motorola MBRD360
10114513