INDUSTRY COMPONENT

PWM Controller IC

PWM Controller IC regulates voltage in power supplies by modulating pulse width for precise control.

Component Specifications

Definition
A Pulse Width Modulation (PWM) Controller IC is an integrated circuit that generates a variable-duty-cycle square wave signal to control the switching of power transistors in voltage regulator modules. It maintains stable output voltage by adjusting the pulse width based on feedback from the output, ensuring efficient power conversion with minimal energy loss in computer power supply units.
Working Principle
The PWM Controller IC operates by comparing a reference voltage with feedback from the output via an error amplifier. This error signal modulates the duty cycle of the pulse train sent to switching transistors (like MOSFETs), adjusting the on/off time to regulate average output voltage. It typically includes oscillator, comparator, and driver circuits to maintain precise control under varying load conditions.
Materials
Silicon semiconductor substrate with copper or aluminum interconnects, encapsulated in plastic (e.g., epoxy resin) or ceramic package; lead frame made of copper alloy; gold or silver wire bonding.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Package TypeSOIC-8, DIP-8, QFN-16
Output CurrentUp to 10A
Duty Cycle Range0% to 100%
Input Voltage Range4.5V to 40V
Switching Frequency100kHz to 1MHz
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 60747, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Overheating due to high switching frequency
  • Electromagnetic interference (EMI)
  • Component failure from voltage spikes
  • Incompatibility with load requirements
FMEA Triads
Trigger: Excessive thermal stress from high current
Failure: IC thermal shutdown or permanent damage
Mitigation: Implement heat sinks, ensure adequate airflow, and use thermal protection circuits
Trigger: Feedback loop instability
Failure: Output voltage oscillation or regulation loss
Mitigation: Optimize compensation network, use stable reference voltages, and follow layout guidelines

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Output voltage tolerance typically ±2% under specified conditions
Test Method
Verification via oscilloscope for pulse characteristics, load regulation tests, and thermal cycling per IEC 60747 standards

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
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of PWM Controller IC

Manufacturer profiles associated with PWM Controller IC.

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Frequently Asked Questions

What is the primary function of a PWM Controller IC in a PSU?

It regulates output voltage by adjusting the duty cycle of switching transistors to maintain stable power delivery under varying loads.

How does PWM improve power supply efficiency?

By switching transistors rapidly between fully on and off states, it minimizes power loss compared to linear regulation, increasing efficiency to 85-95%.

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.

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