Zero drift PGA based Analog Front End Design for Circuit Breakers (ACB/MCCB-ETU) TIDA-00130 (ACTIVE)

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Key Document

Description

This reference design is intended for use in molded case circuit breakers (MCCB) electronic trip units.  The programmable gain amplifier based design acts as the current monitoring for over-current earth fault relays. Utilizing a zero drift programmable amplifier, this design provides a ±10 % pick-up (A) accuracy  and time delay (s) accuracy of 0 to -20%. Additionally, this solution was designed to handle harsh environment conditions by including features such as ambient insensitivity from -10 to 70 ⁰C and high electromagnetic immunity. Finally the analog front end of this design interfaces seemlessly with the TI MSP430 MCU for quicker evaluation and faster time-to-market.

Features
  • Architecture enables the customer to easily create multiple circuit breaker models with different current ranges
  • Using programmable gain control, fault current sensing range can be increased to > 10 times Ir and < 0.2 times Ir
  • Lower total manufacturing cost with reduced component count and less calibration time vs. discrete opamp based electromechanical solution
  • Robust design with ambient insensitivity from -10 to +70°C and better trip time repeatability vs. discrete opamp based electromechanical solution
  • Wide input DC-DC converter with under voltage and overcurrent protection
  • Self-power (CT powered) supply with reduced CT loading and lower power loss

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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
CSD18537NKCS  60V, N ch NexFET MOSFET™, single TO-220, 14mOhm  MOSFETs  Sample & Buy Not Available
ISO1176  2.5 kVrms Isolated RS-485 Profibus Transceiver  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM4041B  Adjustable precision micropower shunt voltage reference with 0.2% accuracy  Voltage references  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
PGA116  Zero-Drift, Programmable Gain Amplifier with MUX  Amplifiers  Sample & Buy Not Available
PGA117  Zero-Drift, Programmable Gain Amplifier with MUX  Amplifiers  Sample & Buy Not Available
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

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18537NKCS Download
ISO1176 Download Download
LM4041B Download Download
Download -
Download Download
LM5017 Download Download
Download Download
LM62 Download Download
PGA116 Download Download
PGA117 Download Download
TPS55010 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1868 17 Apr 2014
Design files (4)
Title Type Size (KB) Date
PDF 2355 18 Mar 2014
ZIP 2542 18 Mar 2014
PDF 207 18 Mar 2014
PDF 421 18 Mar 2014

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