SMT POWER INDUCTORS
Description
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:
• Phase 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
Equivalent1 Transient Inductance per Phase
(nH)
Irated2 per
Phase (Adc)
Magnetizing Inductance per Phase3 nH ±20%, 0Adc
L1 L2 L3 L4 L5 (1-2) (3-4) (5-6) (7-8) (9-10)
Magnetizing Inductance per Phase4 nH MIN, 5Adc
L1 L2 L3 L4 L5 (1-2) (3-4) (5-6) (7-8) (9-10)
DCR/Phase5 (mΩ)
TYP MAX
PA1312NL
2
50
40 310 310
-
-
-
240 240
-
-
-
PA1313NL PA1314NL
3 4
50
40 370 450 370 -
- 285 350 285 -
- 0.
425 0.
5
50
40 370 490 490 370
-
285 385 385 285 -
PA1315NL
5
50 40 370 470 490 470 390 285 365 385 365 285
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.
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