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ERUC23-2R8K

更新时间： 2024-03-03 10:09:31

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ERUC23-2R8K 数据手册

ERU Chokes

ERUC23

ERUC23, SMT flat wire coupled inductor

ERU Coupled inductor

Application note

This coupled inductor can replace two single inductors in interleaved DC/DC circuits to improve

efficiency and save space.

1) Simplified equivalent circuit for simulation

L = 0.5  L

L = L (or L ) – 0.5  L

Example:

ERUC23-4R1K (4.1 H)

= 1.85 m

= 2.05 H

= 5.85 H

2) Connection

Single inductors do not have polarity, but the connection is important to get the right performance

for a coupled inductor, an incorrect connection would diminish the performance. In short, pin 1 & 2

should have the same functionality, pin 3 & 4 have the same functionality. For example in a buck

circuit with two interleaved phases, if pin 1 and pin 2 are connected with switching devices such as

mosfets, then pin 3 and pin 4 should be connected to the output as shown below.

The inductor is not limited to only buck topology but, can be considered in boost or buck-boost

topology.

3) Saturation current margin consideration

For consideration of saturation current margin, L_mcan be considered as zero inductance so that it

would be equivalent to two single inductors with inductance L_kto calculate the I_peakto compare with

specified saturation current of L₃.

Example: ERUC23-4R1K (4.1 H)

Use 2 individual 2.05 H inductors to calculate the maximum peak current to

compare with the saturation current listed in above table.

Please read Cautions and warnings and

Important notes at the end of this document.

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