Error Amplifier (Op-Amp): Supply Voltage ±5 V to ±15 V

Component Specifications

Definition

An error amplifier implemented with an operational amplifier is a critical component in current source circuits that compares a reference voltage with a feedback signal from the load current measurement. It amplifies the voltage difference (error signal) to drive the control element (such as a transistor or MOSFET), maintaining stable output current despite load variations, temperature changes, or supply fluctuations. This component ensures high gain, low offset voltage, and fast response for accurate current regulation in industrial applications.

Working Principle

The error amplifier operates by comparing two input voltages: a reference voltage (setpoint) and a feedback voltage proportional to the output current. The op-amp amplifies the difference between these inputs, producing an output voltage that adjusts the control element in the current source. This negative feedback loop minimizes error, ensuring the output current matches the desired value. Key principles include high open-loop gain for precision, common-mode rejection to reduce noise, and stability through compensation to prevent oscillations.

Materials

Typically constructed with silicon semiconductor materials, including doped silicon for transistors, metal layers (e.g., aluminum or copper) for interconnects, and insulating materials like silicon dioxide. Packaging materials include plastic (e.g., epoxy resin) or ceramic for durability, with gold or tin-lead solder for connections.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Slew Rate	0.5 V/μs to 50 V/μs
Package Type	DIP, SOIC, SOT-23
Supply Voltage	±5 V to ±15 V
Input Offset Voltage	0.5 mV to 5 mV
Operating Temperature	-40°C to 125°C
Gain Bandwidth Product	1 MHz to 100 MHz

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 60747, JEDEC

Parent Products

This component is used in the following industrial products

Current Source Circuit

A specialized electronic circuit designed to provide a stable, precisely controlled current output to a laser diode within a laser driver system.

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Engineering Analysis

Risks & Mitigation

Thermal runaway due to excessive power dissipation
Oscillation or instability in feedback loop
Component failure from voltage spikes or ESD

FMEA Triads

Trigger: High ambient temperature or inadequate cooling
Failure: Overheating leading to reduced performance or permanent damage
Mitigation: Implement thermal management (e.g., heatsinks, ventilation) and select components with higher temperature ratings.

Trigger: Improper compensation or feedback network design
Failure: Oscillations causing erratic current output
Mitigation: Use stability analysis tools, add compensation capacitors, and follow manufacturer guidelines for circuit layout.

Trigger: Voltage transients from inductive loads
Failure: Electrical overstress damaging the op-amp
Mitigation: Include protection circuits like snubbers, clamping diodes, and surge suppressors.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Current regulation accuracy within ±1% to ±5% depending on application requirements

Test Method

Testing involves measuring output current stability under load variations, temperature cycling, and long-term reliability assessments per industry standards like IEC 61000.

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

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Manufacturers of Error Amplifier (Op-Amp)

Manufacturer profiles associated with Error Amplifier (Op-Amp).

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Frequently Asked Questions

What is the primary function of an error amplifier in a current source circuit?

The primary function is to amplify the difference between a reference signal and a feedback signal to control the output current, ensuring it remains stable and accurate under varying conditions.

How does an op-amp improve the performance of an error amplifier?

An op-amp provides high gain, low offset voltage, and good linearity, enabling precise error amplification and fast response in feedback loops for reliable current regulation.

What are common applications of error amplifiers in industrial settings?

Common applications include power supplies, motor drives, welding equipment, battery charging systems, and precision measurement instruments where stable current control is essential.

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.

Error Amplifier (Op-Amp)