INDUSTRY COMPONENT

Feedback Resistor Network

A precision resistor network used in power supply feedback loops to regulate output voltage.

Component Specifications

Definition
A feedback resistor network is a critical electronic component in power supply regulation circuits, typically consisting of multiple precision resistors arranged in a specific configuration (often voltage divider topology) to sample the output voltage and provide a proportional feedback signal to the control IC. This network establishes the closed-loop control that maintains stable output voltage despite load variations, input fluctuations, and temperature changes.
Working Principle
The feedback resistor network operates by creating a voltage divider that samples a fraction of the power supply's output voltage. This sampled voltage (Vfb) is compared against a precise internal reference voltage (Vref) within the regulation IC. Any deviation between Vfb and Vref generates an error signal that adjusts the power stage's duty cycle or conduction time, thereby correcting the output voltage to maintain the setpoint defined by the resistor ratio: Vout = Vref × (1 + R1/R2).
Materials
Thick-film or thin-film resistive material (ruthenium oxide, nickel-chromium) on ceramic substrate (alumina), with epoxy coating for protection. Termination materials: tin-plated copper alloy or solder-coated leads.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Package TypeSOT-23, SOIC, MSOP, DFN
Power Rating0.125W to 0.25W per resistor
Voltage Rating50V to 200V
Resistance Tolerance±0.1% to ±1%
Operating Temperature-55°C to +155°C
Temperature Coefficient±25 ppm/°C to ±100 ppm/°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
IEC 60115, MIL-PRF-55342

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Resistance drift over temperature
  • Thermal runaway in high-power applications
  • Moisture absorption affecting stability
  • Electromigration in thin-film resistors
FMEA Triads
Trigger: Overvoltage stress
Failure: Resistor breakdown/short circuit
Mitigation: Implement input surge protection, use resistors with higher voltage rating
Trigger: Thermal cycling
Failure: Resistance drift or open circuit
Mitigation: Select resistors with low TCR, ensure proper thermal management
Trigger: Contamination during manufacturing
Failure: Corrosion leading to parameter shift
Mitigation: Apply conformal coating, use hermetically sealed packages

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.1% typical for precision applications, ±1% for commercial applications
Test Method
Four-wire Kelvin measurement at 25°C, temperature cycling test 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
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 Feedback Resistor Network

Manufacturer profiles associated with Feedback Resistor Network.

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Frequently Asked Questions

What happens if the feedback resistor network fails?

Failure typically causes loss of voltage regulation - output may become unstable (oscillate), overvoltage (damaging loads), or undervoltage (system malfunction). Common failures include resistor drift, open circuit, or short circuit.

How do I select the right feedback resistor values?

Calculate based on desired output voltage and regulator IC reference voltage using Vout = Vref × (1 + R1/R2). Choose precision resistors with low temperature coefficient and adequate power rating for your application.

Can I use single resistors instead of a network?

While possible, integrated networks provide better matching, tracking, and space efficiency. Discrete resistors may have mismatched temperature coefficients causing voltage drift.

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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Feedback Network (Voltage Divider) Ferrite Core
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