Lesson 4/1724%
MODULE 04

Working Principle

The device physics in working depth: radiative recombination and photon generation, optical coupling efficiency, photocurrent generation and transistor action, why CTR varies with current and temperature, and the dynamic behavior that sets switching speed limits.

⏳ Coming Soon — content in development

Learning Objectives

After completing this module, you will be able to:

Explain photon generation from LED forward current
Trace the optical coupling path and its efficiency losses
Derive CTR behavior versus IF, temperature, and VCE
Analyze switching waveforms and storage/delay times
Predict dynamic performance from datasheet parameters

Planned Topics

Optical coupling physics
Photon generation
CTR behavior in depth
Switching operation
Dynamic characteristics

Reserved Sections

This module will follow the same interactive format as Module 1:

Interactive animations

Animated diagrams and simulations for this module are in development.

Engineering calculators

Module-specific design calculators will appear here.

Design examples

Worked examples with full component values are planned for this section.

Knowledge check

Multiple-choice, true/false, and scenario exercises will be added.

Downloadable resources

PDF notes, reference tables, and checklists will be provided.

While you wait: Module 1 — Introduction to Optocouplers — is fully available, including animations, the CTR and isolation calculators, and a complete knowledge check. Start there →