TIDA-01599
TÜV SÜD-assessed safe torque off (STO) reference design for industrial drives (IEC 61800-5-2)
TIDA-01599
Overview
This reference design outlines a safe torque off (STO) subsystem for a three-phase inverter with CMOS input isolated IGBT gate drivers. The STO subsystem employs a dual-channel architecture (1oo2) with a hardware fault tolerance of 1 (HFT=1). It is implemented following a de-energize trip concept. When the dual STO inputs (STO_1 and STO_2) go active low, the corresponding power supplies of the primary and secondary side of the six isolated IGBT gate drivers, are cut off through load switches. This removes the possibility to control and energize the motor. The STO reference design (1oo2) has been assessed by TÜV SÜD to be generally suitable for SIL 3 and PL e/Cat. 3.
Features
- Dual-channel STO architecture (1oo2) assessed by TÜV SÜD to be suitable for SIL 3 (IEC 61508) and PL e/Cat. 3 (ISO 13849)
- TÜV report, safety concept description and qualitative system FMEA available to further help designers implement the STO subsystem
- STO subsystem for three-phase inverters with CMOS-input isolated IGBT gate drivers such as ISO5852S, UCC21750 or UCC5350
- 24-V isolated input receivers ISO1211 compliant to IEC 61131-2 and ±60-V input tolerance with reverse polarity protection
- Interface to MCU (SIL 1) for diagnostic coverage of the load switches in the STO subsystems
- Option to monitor input and output supply UVLO of the ISO5852S through RDY pin and additional monitoring capabilities with UCC21750 integrated analog-to-PWM isolated sensor
Industrial
- 48-V servo drive
- IGBT-based servo power stage
- Industrial robot mixed I/O module
- Industrial robot vision
- Industrial robot wired teach pendant
- Industrial robot wireless teach pendant
- Isolated AC drive power stage
- Mobile robot motor control
- Mobile robot safety module
- Mobile robot vision
- Multi-axis servo drive
- Multi-axis servo power stage
- Robot position feedback aggregator
- Robot safety module
- Single-axis servo drive
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUDS9B.PDF (2995 K)
Reference design overview and verified performance test data
TIDRVA2A.PDF (856 K)
Detailed schematic diagram for design layout and components
TIDRVA3A.PDF (162 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRVA4A.PDF (339 K)
Detailed overview of design layout for component placement
TIDRVA6A.ZIP (2252 K)
Files used for 3D models or 2D drawings of IC components
TIDCEF0A.ZIP (363 K)
Design file that contains information on physical board layer of design PCB
TIDRVA5A.PDF (1304 K)
PCB layer plot file used for generating PCB design layout
Products
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Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | TUEV-Assessed STO Reference Design for Industrial Drives (IEC 61800-5-2) (Rev. B) | PDF | HTML | Nov. 11, 2022 |
| Functional safety information | FMEA STO Concept TIDA-01599 | May 17, 2022 | ||
| Functional safety information | Overview STO Concept TIDA-01599 | PDF | HTML | Apr. 19, 2022 | |
| Functional safety information | STO Concept TUEV Report TF97657T Rev.1.1 | Feb. 24, 2022 | ||
| Functional safety information | Design Smaller Safe Torque Off (STO) Systems Using 3-Phase Smart Gate Drivers | PDF | HTML | Mar. 04, 2021 | |
| E-book | Ein Techniker-Leitfaden für Industrieroboter-Designs | Mar. 25, 2020 | ||
| E-book | E-book: An engineer’s guide to industrial robot designs | Feb. 12, 2020 |
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