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.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Detailed overview of design layout for component placement
Complete listing of design components, reference designators, and manufacturers/part numbers
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Detailed schematic diagram for design layout and components
Includes TI products in the design and potential alternatives.
| 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 4, 2021 | |
| E-book | E-book: An engineer’s guide to industrial robot designs | Feb 12, 2020 |
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