Signal Processing Subsystem and Current Input Based Self Power for Breaker Applications (ACB/MCCB)


Design files


THe TIDA-00498 reference design features signal processing front-end and self-power block for electronic trip unit (ETU) used in circuit breakers.  A FRAM based micro-controller is used for processing current inputs from signal conditioning amplifiers for 3-phase, neutral and ground current. Two gains are used to extend the range for phase current measurement.

This reference design can also self-power using rectified current input. TIDA-00498 is desiged for fast and repeatable tripping (within 30mS) for wide current and temperature range.

  • Measures three currents (phase) with input range of (0.2 to 12 INOMINAL) and two current (Neutral, Earth) with (0.05 to 2 INOMINAL) within ±3%
  • Uses TI’s MSP430™ FRAM MCU for Fast Startup, Startup Time Including One-Cycle RMS Computation is < 30 ms
  • Undervoltage Sense Provides Approximate 200-μs Reset Time After Power-Up
  • Self-Power Supply (Rectified Current Input Based) With MOSFET-Based Shunt Regulation
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUA09.PDF (3142 K)

Reference design overview and verified performance test data

TIDRGA5.PDF (1034 K)

Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Detailed overview of design layout for component placement

TIDRGB0.ZIP (5457 K)

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


Includes TI products in the design and potential alternatives.

General-purpose op amps

LMV551Single, 5.5-V, 3-MHz, low quiescent current (37-μA) operational amplifier

Data sheet: PDF | HTML
General-purpose op amps

OPA4314Quad, 5.5-V, 3-MHz, low noise (4.6-nV/√Hz), RRIO operational amplifier

Data sheet: PDF | HTML
Analog temperature sensors

LMT87±2°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain

Data sheet: PDF | HTML

LM2903Dual differential comparator

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

LM50177.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR596916 MHz MCU with 64KB FRAM, 2KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17571Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18537NKCS60-V, N channel NexFET™ power MOSFET, single TO-220, 14 mOhm

Data sheet: PDF | HTML
Shunt voltage references

LM4041BAdjustable, precision micropower shunt voltage reference with 0.2% accuracy

Data sheet: PDF
Supervisor & reset ICs

LM8364Active-low voltage monitor with low quiescent current & 2.5% threshold accuracy

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Signal Processing Front-End for Electronic Trip Used in ACB/MCCB Design Guide Jul. 03, 2015

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