TIDUEZ1
March 2021
Description
Resources
Features
Applications
5
1
System Description
1.1
Key System Specifications
2
System Overview
2.1
Block Diagram
2.2
Design Considerations
2.2.1
Multichannel SSR with Independent Isolation Between SSR Channels
2.2.2
Design Challenge With Single Isolation
2.2.3
Multichannel SSR Drive With Single Isolation Multichannel Digital Isolator
2.2.4
Need of High-Impedance Voltage Translator
2.2.5
Design to Minimize Cross-Coupling and MOSFET Gate Pick up Due to Other SSR Switching
2.2.6
Schematic: Design of Gate-Drive Circuit
2.2.6.1
Calculation of Gate-Driver Power Consumption
2.2.7
Schematic: Digital Isolator Circuit
2.2.8
Schematic: 3.3 V to 10V_ISO, 5V_ISO Power Supply
2.3
Highlighted Products
2.3.1
ISO7760
2.3.2
ISO7740
2.3.3
ISO7041
2.3.4
CSD19538Q2
2.3.5
CSD17382F4
2.3.6
TPL7407LA
2.3.7
TLV760
2.3.8
TLC555
3
Hardware, Software, Testing Requirements, and Test Results
3.1
Hardware Requirements
3.1.1
Test Equipment Needed to Validate Board
3.1.2
Test Conditions
3.1.3
Test Procedure
3.2
Test Setup
3.3
Test Results
3.3.1
Functional Tests
3.3.2
Overcurrent Testing With External Fuse
3.3.3
Surge Testing
3.3.4
Multichannel SSR Driven From Two 24-VAC Transformers
3.3.5
Alternate SSR Topology for High Voltage
4
Design and Documentation Support
4.1
Design Files
4.1.1
Schematics
4.1.2
BOM
4.2
Documentation Support
4.3
Support Resources
4.4
Trademarks
5
About the Author
4.2
Documentation Support
Texas Instruments,
ISO776x High-Speed, Robust EMC, Reinforced Six-Channel Digital Isolators Data Sheet
Texas Instruments,
ISO774x High-Speed, Robust-EMC Reinforced and Basic Quad-Channel Digital Isolators Data Sheet
Texas Instruments,
ISO7041 Ultra-Low Power Four-Channel Digital Isolator Data Sheet
Texas Instruments,
TIDA-00751
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Solid State Relay 24V AC Switch with Galvanic Isolation Reference Design