LM2577S-ADJ National Semiconductor, LM2577S-ADJ Datasheet - Page 17
LM2577S-ADJ
Manufacturer Part Number
LM2577S-ADJ
Description
DC/DC Converter IC
Manufacturer
National Semiconductor
Specifications of LM2577S-ADJ
Input Voltage
40V
Output Voltage
37V
No. Of Pins
5
Termination Type
SMD
Mounting Type
Through Hole
Output Current Max
3A
Peak Reflow Compatible (260 C)
No
Supply Voltage Max
40V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2577S-ADJ
Manufacturer:
NS
Quantity:
11 200
Part Number:
LM2577S-ADJ
Manufacturer:
NS/国半
Quantity:
20 000
Company:
Part Number:
LM2577S-ADJ/NOPB
Manufacturer:
National Semiconductor
Quantity:
1 981
Company:
Part Number:
LM2577S-ADJ/NOPB
Manufacturer:
Texas Instruments
Quantity:
465
Application Hints
Note: These charts assume that the inductor ripple current inductor is approximately 20% to 30% of the average inductor current (when the regulator is under
full load). Greater ripple current causes higher peak switch currents and greater output ripple voltage; lower ripple current is achieved with larger-value
inductors. The factor of 20 to 30% is chosen as a convenient balance between the two extremes.
C. Select an inductor from the table of Figure 10 which
cross-references the inductor codes to the part numbers
of three different manufacturers. Complete specifications
for these inductors are available from the respective
manufacturers. The inductors listed in this table have the
following characteristics:
AIE: ferrite, pot-core inductors; Benefits of this type are
low electro-magnetic interference (EMI), small physical
size, and very low power dissipation (core loss). Be
careful not to operate these inductors too far beyond their
maximum ratings for E • T and peak current, as this will
saturate the core.
Pulse: powdered iron, toroid core inductors; Benefits are
low EMI and ability to withstand E • T and peak current
above rated value better than ferrite cores.
Renco: ferrite, bobbin-core inductors; Benefits are low
cost and best ability to withstand E • T and peak current
above rated value. Be aware that these inductors gener-
ate more EMI than the other types, and this may interfere
with signals sensitive to noise.
FIGURE 9. LM1577-ADJ/LM2577-ADJ Inductor Selection Graph
(Continued)
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