Low-Power, Low-Noise Analog Front End Design for Circuit Breakers (ACB/MCCB-ETU)
TIDA-00128
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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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Design Files

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17571Q2  30V, N ch NexFET MOSFETâ„¢, single SON2x2, 29mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
ISO1176  40-Mbps, half-duplex, isolated RS-485 & RS-422 transceiver  Isolated interfaces  Sample & Buy View Design Kits & Evaluation Modules
LM293  Dual differential comparator, industrial grade  Amplifiers  Sample & Buy Not Available
LM5017  7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LM62  ±2°C analog output temperature sensor, with 15.6mV/°C gain  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 View Design Kits & Evaluation Modules
TPS55010  2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETS  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
TPS715  50-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17571Q2 WSON (DQK)| 6 Download Download
ISO1176 Download Download
LM293 Download Download
Download Download
Download Download
LM5017 Download Download
Download Download
LM62 Download Download
TPS55010 Download Download
TPS715 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1954 25 Feb 2014
Design files (5)
Title Type Size (KB) Date
ZIP 3361 26 Feb 2014
ZIP 287 26 Feb 2014
PDF 2328 26 Feb 2014
PDF 204 26 Feb 2014
PDF 426 26 Feb 2014

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