High Resolution, Fast Startup Analog Front End for Air Circuit Breaker Reference Design

(ACTIVE) TIDA-00661

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Key Document

Description

The TIDA-00661 reference design features signal processing front-end subsystem for electronic trip units (ETU) used in air circuit breakers (ACB) or molded case circuit breakers (MCCB). This subsystem consists of Delta-Sigma ADC with 24-Bit resolution and fast startup (< 3ms), ±2.5V regulator, FRAM-based microcontroller (MCU) for interfacing to ADC and processing the inputs. The subsystem is designed to start-up, compute full-cycle RMS current, make decisions, and provide trip signal to the solenoid within 30 ms.

Features
  • Measurement of AC input from 10V to 750V and 50mA to 25A within ±1% with fixed gain
  • Voltage and Current inputs are interfaced to a 24-Bit Delta-Sigma ADC with Fast startup (< 3ms)
  • DC-DC converters configured in Fly-Buck configuration to generate supply output (2W/ 8W)
  • Provides option to measure 3 earth fault current inputs with a single gain opamp interfaced to 12-Bit internal ADC of MCU
  • On-Board potential divider provided to measure the AC input voltage and Burden resistors are provided to connect external CT secondary input for current measurement
  • Regulators generate 3.3V and 5V (MCU and ADC board), ±2.5V and 3V (ADC analog supply)

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TI Devices (11)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS131E08S  8-Channel, 24-Bit, AFE with Fast Power-Up Time for Power Monitoring, Control, and Protection  Analog-to-Digital Converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
LM2903  Dual Differential Comparator  Amplifiers  Sample & Buy Not Available
LM4041B  Adjustable Precision Micropower Shunt Voltage Reference, 0.2% accuracy  Voltage Reference  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
LM5160  LM5160 Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules
LM8364  Active Low Voltage Monitor with Low Quiescent Current and 2.5% Threshold Accuracy   Power Management  Sample & Buy Not Available
LMT87  2.7V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92  Temperature Sensors  Sample & Buy View Design Kits & Evaluation Modules
LMV614  Low voltage, low power, RRIO general purpose amplifier  Operational Amplifiers (Op Amps)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR5969  MSP430FR5969 16 MHz Ultra-Low-Power Microcontroller featuring 64 KB FRAM, 2 KB SRAM, 40 IO  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS723  200mA, Negative Output Low-Dropout Linear Regulator  Linear Regulator (LDO)  Sample & Buy Not Available
TPS732  Cap-Free, NMOS, 250mA Low Dropout Regulator with Reverse Current Protection  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (2)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 3740 09 Sep 2016 487
PDF 3070 20 Jul 2015 3,693
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 660 14 Dec 2015 142
ZIP 9909 14 Dec 2015 51
ZIP 2825 14 Dec 2015 25
ZIP 625 14 Dec 2015 20
ZIP 504 14 Dec 2015 29
ZIP 1380 14 Dec 2015 169
Related Tools & Software

Reference Designs (1)



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