Low-Power, Low-Noise Analog Front End Design for Circuit Breakers (ACB/MCCB-ETU)
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Key Document
Description
This reference design is intended for use in molded case circuit breakers (MCCB) electronic trip units. The op amp based design acts as current monitoring for over-current earth fault relays. Utilizing a low cost op amp, this design provides a pick-up (A) accuracy ±10 % and time delay (s) accuracy 0 to -20%. Additionally, this design takes harsh environment conditions in mind with features such as ambient insensitivity from -10 to 70°C and high electromagnetic immunity. Finally the analog front end of this design seemlessly interfaces to TI MSP430 MCU for quicker evaluation and faster time-to-market.
Features
- Pick-up accuracy at ±10 % and time delay accuracy at 0 to -20% offer wide range of adjustment for maximum flexibility
- Ambient insensitivity from -10 to +70°C for global design and worldwide acceptance
- Excellent trip time repeatability
- Wide input DC-DC converter with under voltage and overcurrent protection
- Self-power (CT powered) supply with reduced CT loading and Power loss
- Robust design that prevents phase reversal in overdrive conditions and high electrostatic discharge (ESD) protection (4-kV HBM)
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Schematic/Block Diagram
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Test Data
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Bill of Materials (BOM)
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TI Devices (8)
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| Sample & Buy |
Design Kits & Evaluation Modules |
| CSD17571Q2 |
30V N-Channel NexFET Power MOSFETs, CSD17571Q2 |
MOSFETs |
Sample & Buy |
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| ISO1176 |
2.5 kVrms Isolated RS-485 Profibus Transceiver |
Isolation |
Sample & Buy |
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| LM293 |
Dual Differential Comparator |
Amplifiers |
Sample & Buy |
Not Available |
| LM5017 |
7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator |
Step-down (buck) |
Sample & Buy |
View Design Kits & Evaluation Modules |
| LM62 |
±2°C Analog Output Temperature Sensor |
Temperature sensors |
Sample & Buy |
Not Available |
| OPA4314 |
Quad, 3MHz, Low-Power, Low-Noise, RRI/O, 1.8V CMOS Operational Amplifier |
Operational amplifiers (op amps) |
Sample & Buy |
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| TPS55010 |
2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETS |
Offline & isolated DC/DC controllers & converters |
Sample & Buy |
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| TPS715 |
50 mA, 24 V, 3.2-μA Iq, Low-Dropout Linear Regulator in SC70 Package |
Power management |
Sample & Buy |
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CAD/CAE symbols
Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
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Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.
Step 1: Download and install the free download.
Step 2: Download the Symbol and Footprint from the CAD.bxl file table.
Step 3: Open the .bxl file with the Ultra Librarian software.
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Both PCB footprints and schematic symbols are available for download in a vendor neutral format, which can then be exported to the leading EDA CAD/CAE design tools using the Ultra Librarian Reader. The reader is available as a (free download.).
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Technical Documents
View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
User guides (1)
| Title | Abstract | Type | Size (KB) | Date |
| | | PDF | 1954 |
25 Feb 2014
|
Selection guides (1)
| Title | Abstract | Type | Size (KB) | Date |
| | | PDF | 3478 |
06 Mar 2015
|
Design files (4)
| | | ZIP | 287 |
26 Feb 2014
|
| | | PDF | 2328 |
26 Feb 2014
|
| | | PDF | 204 |
26 Feb 2014
|
| | | PDF | 426 |
26 Feb 2014
|
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