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SMT & SMD Power Inductor Specifications
How to read our online catalogue 1, 2, 3, 4
(5.) SRF Self-resonant
frequency.
The RF engineer might
be more concerned when it is for the frequency resonator
because he needs high frequency.
The power engineer doesn't care because the frequency
is lo, maybe less than 1MHz. Usually, he would apply
300 to 600 kHz
(6.) Isat (A):
Saturation current. The
inductor could work below this DC current. If the loading
(A) is more than it the magnetic saturation would appear,
the function would drop very fast.
(7.) Irms (A)
The temperature rising
would be ^40°C when it loads some current. It might
cause the copper loss or core loss. If the temperature
becomes high, the efficiency could be lower and it is
useless when the temperature reaches a certain point.
(8.)
If the value of inductance
& IDC (the smaller RDC) is larger we need the larger
core to meet the specification. The space of the PCB
should have much limited so the dimension is a very
important factor.
(9.)
Actually the IDC of our
inductors is much larger than the specifications.
For example: TSB125-150M, The value of our catalogue
is 3.3A but our ability is 5.5A.
It is designed for a notebook PC manufacturer. The engineer
wants the component cheap and functionality good, it
could be loaded with more current because the CPU is
improved its speed then it needs more power to support
it. We need the instrument to be lighter and smaller,
so it allows smaller space for components.
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