Switching power supplies are widely adopted in consumer chargers, industrial control equipment, new energy modules and household appliances. The power inductor is an indispensable passive component in the circuit. Many engineers encounter unstable output, excessive temperature rise or large noise simply because of improper inductor selection.

If you are sourcing standard or custom inductors for your power supply design, this guide will sort out core selection criteria and typical pitfalls for your reference.

Inductance directly affects current ripple. Higher inductance helps reduce ripple current, yet it may lead to larger component size. You need to match the inductance according to your switching frequency and circuit topology.
Note: The inductance value will drop obviously when under heavy DC bias current. Do not only refer to the zero-bias inductance data.

• Rated DC Current: The maximum continuous current without overheating.
• Saturation Current: The current value when inductance decreases by 20%~30%. Once the current exceeds saturation current, inductance will drop sharply and the circuit will work abnormally. Always reserve enough current margin in your design.

Different core materials fit different frequency bands. High-frequency inductors use low-loss ferrite cores to cut down core loss. Confirm the working frequency of your power supply before finalizing the model.

Limited PCB space requires compact inductors such as EF25, EEL19 and EPC17 series. For equipment working in harsh environments, choose inductors with high temperature resistance and comply with RoHS standards.

1. Only focus on inductance value and ignore DC bias performance
2. No sufficient margin for saturation current under peak load
3. Select low-frequency inductors for high-frequency circuits, resulting in serious heat generation
4. Ignore installation size and height restrictions on PCB
5. Fail to confirm whether customized winding parameters are supported

• EF series inductors: Adapter, small-size switching power supply
• EE series inductors: Industrial power supply, battery charging module
• EPC series inductors: Slim charger, portable electronic equipment

Standard models can meet most mass-production demands. If your project has special requirements on inductance, current or dimension, customized winding service is available.

A1: Yes. We support customized winding, pin distance and inductance parameters. Please offer your technical specifications or circuit requirements for quotation.

A2: All our inductors and transformers meet RoHS environmental standards. Relevant test reports can be provided upon request.

A3: MOQ depends on specific models. Contact our sales team to get detailed information.

Inductor selection balances performance, size, temperature and cost. It is recommended to complete sample testing before mass production to avoid later quality risks.

If you are looking for a reliable manufacturer of high-frequency power inductors and transformers, we are ready to offer technical support and competitive pricing.

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