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| Revision | Date | Name | Change |
|---|---|---|---|
| 1.2 | 2018/10/25 | Navaneeth Kumar N (TI), Anant Kamath (TI) | Version shared with TUEV SUED for feedback. Refer to “Review Protocol_Concept V1.0.docx” |
| 1.3 | 2021/08/04 | M. Staebler (TI) |
Changed format to according to TUEV template, added additional references, added further info on conditions of use/assumptions and STO_1 and STO_2 subsystems. Adjusted MCU signal names on schematics to reflect input or output signal w/ MCU. Added info on reinforced isolated gate driver ISO5852S, and pin-compatible ISO5452. |
| 1.4 | 2021/09/23 | M. Staebler (TI) | Updated conditions of use, removed the STO latching feature, added table to explain U7 load switch QOD. |
| 1.5 | 2021/09/29 | M. Staebler (TI) | Updated figure 3 which shows STO_1 subsystem (added second transistor Q3 for redundant VCC clamp), added reference to IEC 615008-2 table A DC fault model. Updated figure 4 to match the schematics rev E2 |
| 1.6. | 2021/11/11 |
M. Staebler, C. Gao (TI) |
Added STO_FB channel, updated block diagram, added description of STO-FB logic and updated system FMEA and references. Modified file name to include STO. |
| 1.6a | 2022/01/31 | M. Staebler (TI) | No change in content, corrected typos only. |
| 1.6b | 2022/05/18 | M. Staebler (TI) | Correction to FMEA STO Concept TIDA-01599 secure link |
This document describes a concept implementation of the safety function safe torque off (STO) according to IEC 61800-5-2 for a three-phase IGBT inverter for industrial drives.
The STO subsystem is based on the TI TIDA-01599 reference design and utilizes a dual-channel approach with HFT = 1 specifically for isolated IGBT gate drivers with CMOS and TTL logic input like TI’s reinforced isolated gate driver ISO5852S or ISO5452.
The safety integrity level for the STO function is capable of SIL 3 according to IEC 61508 and category 3 PL e per ISO 13849, as assessed by TÜV SÜD.
| Document | Description |
|---|---|
| Design guide | Redundant dual-channel safe torque off (STO) reference design for AC inverters and servo drives, Texas Instruments, TIDA-01599, https://www.ti.com/lit/pdf/TIDUDS9 Design files will be updated as reflected in this document. |
| Schematics | Updated TIDA-01599 schematic rev. E2: TIDA-01599E2.1(001)_Sch.pdf TIDRVA2 |
| Design guide | Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters Reference Design, Texas Instruments, TIDA-00199, TIDU670 |
| Data sheet | ISO1211, Single-channel Isolated 24-V to 60-V digital input receiver for digital input modules, Texas Instruments, https://www.ti.com/product/ISO1211 |
| Data sheet | ISO5452, 2.5-A / 5-A 5.7-kV RMS single channel isolated gate driver with split output and protection features, Texas Instruments, https://www.ti.com/product/ISO5452 |
| Data sheet | ISO5852S, 2.5-A / 5-A, 5.7-kV RMS single channel isolated gate driver with split output and protection, Texas Instruments, https://www.ti.com/product/ISO5852S |
| Data sheet | TPS22919, 5.5-V, 1.5-A, 90-mΩ load switch with adj. output discharge, Texas Instruments, https://www.ti.com/product/TPS22919 |
| Data sheet | TPS27S100, 40-V, 80-mΩ, 4-A, 1-ch, Industrial high-side switch with adjustable current limiting and current, Texas Instruments, https://www.ti.com/product/TPS27S100 |
| Data sheet | TIOS101, TIOS101x Digital Sensor Output Drivers with Integrated Surge Protection, https://www.ti.com/lit/ds/symlink/tios1013.pdf |
| Data sheet | ISO7710 High Speed, Robust EMC Reinforced Single-Channel Digital Isolator, https://www.ti.com/lit/ds/symlink/iso7710.pdf |
| Concept FMEA | For access to FMEA STO Concept TIDA-01599, use this secure link |
| Functional safety information | TPS22919-Q1 Functional Safety FIT Rate, FMD and Pin FMA: TPS22919-Q1 FMD_FIT_FMA Document.pdf |