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 microcontroller 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 designed 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
Parts Include;
CSD17571Q2 30V N-Channel NexFET Power MOSFET
CSD18537NKCS 60-V, N-Channel NexFET™ Power MOSFET
LM2903 Dual Differential Comparator
TPS7A6533-Q1 Automotive 300-mA 40-V Low-Dropout Regulator With Ultra-Low Quiescent Current
OPA4314 Quad, 3MHz, Low-Power, Low-Noise, RRI/O, 1.8V CMOS Operational Amplifier
MSP430FR5969 16 MHz Ultra-Low-Power Microcontroller featuring 64 KB FRAM, 2 KB SRAM, 40 IO
LMV551 3 MHz, Micropower RRO Amplifier
LMT87 2.7V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92
LM8364 Micropower Undervoltage Sensing Circuits
LM5017 7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator
LM4041B Adjustable Precision Micropower Shunt Voltage Reference, 0.2% accuracy
Learn more by downloading the reference design below
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