Datasheet

Measuring Method of Inductance/Q
<Rated Current>
• Based on Inductance Change
(LQH2HP_G0 Series)
Inductance will be within -30% of minimum rated
Inductance value.
(
Other LQH_P Series except for LQH2HP_G0 Series )
Inductance will be within ±30% of nominal
Inductance value.
• Based on Temperature Rise
For LQH2MC series·LQH_P series rated current is
set to keep temperature rise caused by self heating
40°C or less.
For other Inductor for Power Lines please refer to
individual specifications.
1. Residual elements and stray elements of test fixture
can be described by F-parameter as shown in the
following:
2. The impedance of chip inductor (chip coil) Zx and
measured value Zm can be described by input/output
current/voltage.
3. Thus, the relation between Zx and Zm is shown in the
following:
4. Lx and Qx should be calculated with the following
equation.
● Measuring Method
V1 A
=
B
I
1 CD
V
2
I2
AB
CD
Zm
Zx
V
1
V2
I1 I2
ProductTest fixtureTest Head
V1
I1 ,
Zm =
V2
I2
Zx =
Zm - β
1 - ZmΓ
Zx = α
where, α = D / A = 1
β = B / D = Zsm - (1 - Yom Zsm) Zss
Γ = C / A = Yom
Zsm: measured impedance of short chip
Zss: residual impedance of short chip*
Yom: measured admittance when opening the fixture
0.556nH
0.771nH
LQW15C
LQW18C
Residual
Impedance
Series
*Residual impedance of short chip
Lx: Inductance of chip inductor (chip coil)
Qx: Q of chip inductor (chip coil)
f: Measuring frequency
,
Im (Zx)
2πf
Lx =
Im (Zx)
Re (Zx)
Qx =
<Handling of a Substrate>
After mounting products on a substrate, do not apply
any stress to the product caused by bending or
twisting to the substrate when cropping the substrate,
inserting and removing a connector from the substrate
or tightening screw to the substrate.
Excessive mechanical stress may cause cracking in
the Product.
Bending Twisting
Inductor for Power Lines (Power Inductor) !Caution/Notice
79
Inductor for Low Frequency CircuitsRF Inductor
!Caution/ Notice
Inductor for Power Lines (Power Inductor)
!Note
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please review our product specifications or consult the approval sheet for product specifications before ordering.
O05E.pdf
Oct.13,2011