SMT POWER INDUCTORS
Power Beads - Volta 1 & 2 Series
Notes from Tables
1. The rated current as listed is either the saturation current or the
heating current depending on which value is lower.
2. The saturation current is the current which causes the
inductance to drop by 10% at the stated ambient temperatures
(-40°C, 25°C, 125°C). This current is determined by placing the
component in the specified ambient environment and applying
a short duration pulse current (to eliminate self-heating effects)
to the component.
3. The heating current is the DC current which causes the temper-
ature of the part to increase by approximately 30°C. This
current is determined by mounting the component on a PCB
with .25" wide, 3 oz. equivalent copper traces, and applying the
current to the device for 30 minutes.
4. In high volt*time applications, additional heating in the
component can occur due to core losses in the inductor
which may neccessitate derating the current in order to limit
the temperature rise of the component. In order to determine
the approximate total losses (or temperature rise) for a given
application both copper losses and core losses should be taken
into account.
5. Optional Tape & Reel packaging can be ordered by adding a
“T” suffix to the part number, (i.e. PA0274T).
6. To order RoHS compliant part, add the suffix "NL" to the part
number (i.e. PA0274 becomes PA0274NL and PA0274T
becomes PA0274NLT).
Estimated Temperature Rise:
.833
Trise
= Coreloss (mW) + Copper Loss (mW)
(°C)
K0
Coreloss
= K1 *
(
Fsw(kHz)
)
1.6688
* (K2 * dI)
2.17
(mW)
Copper Loss
= Irms
2
* DCR(m
Ω
) (mW)
Irms
=
IDC
2
+ dI
2
(Arms)
12
Fsw(kHz)
= switching frequency (kHz)
dI
= delta I across the component (A)
The temperature of the component (ambient temperature +
temperature rise) should be within the listed operating
temperature range.
½
Inductance vs Current Characteristics
P1681, P2005, P2004
120
Percentage of Initial Inductance
100
80
60
40
20
0
P1
P2
P3
PA0229 Inductance vs. DC Current at 25°C
Percent of Initial Inductance
(%)
120
100
80
60
40
20
0
0
5
10
15
20
25°
0
0.2
0.4
0.6
0.8
1.0
Normalized I
DC
1.2
1.4
1.6
1.8
25
100°
30
35
40
45
Current (A
DC
)
P1
-
Initial Inductance,
Lo (.1V
RMS
, 1MHz, 0A
DC
, 25°C)
P2
-
Inductance
(typically 95% L
O
) at
Rated I
DC
.
Normalized Inductance
P3
-
Inductance
(typically 90% L
O
) at
I
PK
.
PA0274 Inductance vs. DC Current at 25°C
Percent of Initial Inductance
(%)
120
100
80
60
40
20
0
0
2
4
6
Current (A
DC
)
Percent of Initial Inductance
(%)
PA0277 Inductance vs. DC Current at 25°C
120
100
80
60
40
20
0
0
2.5
5
7.5
10
12.5
15
17.5
20
Current (A
DC
)
8
10
12
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Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
names mentioned herein may be trademarks or registered trademarks of their respective owners.
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