Output Filter Inductor: Frequency Range Up to 500 kHz

Component Specifications

Definition

An output filter inductor is a passive electronic component used in computer power supply unit (PSU) voltage regulator modules to smooth the rectified DC voltage by storing energy in a magnetic field and releasing it to reduce ripple and noise, ensuring stable power delivery to sensitive computer components.

Working Principle

Operates on electromagnetic induction principles: when DC current with ripple passes through the inductor coil, it creates a magnetic field that stores energy; as current attempts to change (due to ripple), the inductor opposes this change by inducing a back EMF, effectively filtering out high-frequency noise and smoothing the output voltage.

Materials

Core: Ferrite (Mn-Zn or Ni-Zn) or powdered iron; Wire: Copper magnet wire (typically enamel-insulated); Bobbin: Thermoplastic (PBT, PET, or nylon); Encapsulation: Epoxy resin or silicone for protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inductance	10 μH to 1000 μH
DC Resistance	5 mΩ to 50 mΩ
Current Rating	5 A to 30 A
Frequency Range	Up to 500 kHz
Saturation Current	Specified at 10-20% above rated current
Operating Temperature	-40°C to +125°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 62368-1, AEC-Q200

Parent Products

This component is used in the following industrial products

Computer Power Supply Unit (PSU) Voltage Regulator Module

Electronic component that stabilizes and regulates DC voltage outputs within a computer power supply.

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Engineering Analysis

Risks & Mitigation

Core saturation leading to inductance drop
Overheating due to high current or poor cooling
Mechanical damage from vibration
Insulation breakdown causing short circuits

FMEA Triads

Trigger: Core material degradation under high temperature
Failure: Reduced inductance, increased ripple voltage
Mitigation: Use high-temperature ferrite cores and ensure adequate thermal management

Trigger: Wire insulation damage from sharp edges
Failure: Short circuit, component failure
Mitigation: Implement proper bobbin design with rounded edges and quality control checks

Trigger: Excessive ripple current beyond rating
Failure: Overheating, thermal runaway
Mitigation: Design with current derating and incorporate overcurrent protection circuits

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Inductance tolerance typically ±10% to ±20%; current tolerance based on thermal and saturation limits

Test Method

Inductance measured via LCR meter at specified frequency; current testing per IEC 62024-2 for saturation; thermal cycling per MIL-STD-202

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Manufacturers of Output Filter Inductor

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Frequently Asked Questions

What is the primary function of an output filter inductor in a PSU?

To smooth the DC output voltage by reducing ripple and noise, ensuring stable power for computer components like CPUs and GPUs.

How does an output filter inductor differ from an input filter inductor?

Output filter inductors handle smoothed DC after regulation, focusing on low-frequency ripple; input filter inductors work on AC input to suppress EMI and harmonics.

What materials are commonly used for the core?

Ferrite cores (Mn-Zn or Ni-Zn) for high-frequency efficiency or powdered iron for high saturation current applications.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Output Filter Inductor