SMT POWER INDUCTORS
Power Beads - PA131xNL Series Coupled Inductors
Two, three, four and five phase Coupled Inductors for
VR10/VR11 applications
For use only with Volterra VT1105M
®
, VT1115M
®
chipsets
Coupled Inductors enable:
•
Output ripple current reduction due to AC magnetic
field cancellation within the inductor core
•
Improved efficiency due to lower peak currents
•
Reduction in required output capacitance
•
Faster transient response due to the ability to use
lower effective inductance values
•
Reduced overshoot/undershoot during load transients
•
Frequency range up to 2MHz
Electrical Specifications @ 25°C — Operating Temperature -40°C to +130°C
Pulse
Part No.
Number
of
Coupled
Phases
2
3
4
5
Equivalent
1
Transient
Inductance
per Phase
(nH)
50
50
50
50
Irated
2
per
Phase
(Adc)
40
40
40
40
Magnetizing Inductance per Phase
3
nH ±15%, 0Adc
L1
(1-2)
300
360
360
360
L2
(3-4)
300
440
480
460
L3
(5-6)
-
360
480
480
L4
(7-8)
-
-
360
460
L5
(9-10)
-
-
-
360
Magnetizing Inductance per Phase
4
nH MIN, 5Adc
L1
(1-2)
240
285
285
285
L2
(3-4)
240
350
385
365
L3
(5-6)
-
285
385
385
L4
(7-8)
-
-
285
365
L5
(9-10)
-
-
-
285
0.425
0.5
DCR/Phase
5
TYP
MAX
PA1312NL
PA1313NL
PA1314NL
PA1315NL
NOTES:
1. In a non-coupled multi-phase topology, the power supply sees the same induc-
tance during transient and steady-state conditions. As a result, any attempt to
lower the inductance to improve transient response has the negative result of
increasing ripple and peak currents throughout the system during steady-state
operation. However, in a coupled inductor multi-phase topology, the interaction
of magnetic fields from each phase enables an overall reduction in ripple
current during steady-state operation and a lower equivalent inductance
during transient operation. The equivalent transient inductance per phase, as
listed, represents the actual value of inductance that would be required in an
non-coupled topology to realize the same transient performance. This value is
achieved by core and winding geometry and is not directly measured by Pulse.
For more information on the operation of the coupled inductor topology, please
contact Volterrra.
2.The rated current per phase is based on Volterra's testing of the Pulse
coupled inductors.
3.The magnetizing inductance per phase is the measured inductance (at 0Adc)
across each phase when all other phases are open-circuit. This inductance is a
Pulse production measurement. Although the equivalent inductance per phase
during steady-state is significantly higher then the equivalent transient induc-
tance as listed, it should not be confused with the magnetizing inductance.
4.The magnetizing inductance per phase is the measured inductance (at 5Adc)
across each phase when all other phases are open-circuit. This inductance is a
Pulse production measurement. This test is performed to verify that the induc-
tor can withstand a phase-to-phase load imbalance of 5Adc without saturating.
5.The nominal value of DCR/phase is for reference only. For production testing,
the maximum limit is used.
6.The VT1105M
®
and VT1115M
®
are registered trademarks of Volterra
Semiconductor Corporation.
Mechanical
PA1312NL
.720 MAX
18,29
.354
9,00
MAX
4X
.134
3,40
2X
.193
4,90
.732
18,60
Schematic
.354
9,00
Date Code Country of Origin
PA1312NL
2
3
Weight
. . . . . . . . . . .3.0 grams
Tape & Reel
. . . . . . . .650/reel
Tray
. . . . . . . . . . . . . . .60/tray
Dimensions:
Inches
mm
Unless otherwise specified, all tolerances are ± .010
0,25
L1
1
2 3
L2
4
1
4
SUGGESTED PAD LAYOUT
.205
5,20
MAX
.559
14,20
1.260
± .012
32.00
± 0,30
.366
9,30
.630
16,00
.217
5,50
TAPE & REEL LAYOUT
USER DIRECTION OF FEED
USA 858 674 8100
•
UK 44 1483 401 700
•
France 33 3 84 35 04 04
•
Singapore 65 6287 8998
•
Shanghai
86 21 32181071
•
China 86 769 5538070
•
Taiwan 886 2 26980228
www.pulseeng.com
P636.A (11/05)
PULSE [ PULSE A TECHNITROL COMPANY ]
