Overview
The NCS37010MNTWG, produced by onsemi, is a highly integrated signal processor designed for Ground Fault Circuit Interrupter (GFCI) applications. It is fully compliant with UL943 standards and features advanced self-test and lockout functionalities. The device incorporates a flexible power supply, differential fault detection, and grounded-neutral detection circuits, making it a robust solution for various GFCI implementations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 6.0 to 14 | V |
| Supply Current Range | 10 | mA |
| Operating Temperature | -40 to 85 | °C |
| Package Type | QFN16 or TSSOP-20 | |
| Power Consumption | < 15 mW @ 6 V | |
| SCR Trigger Current | 8 mA | |
| Ground Fault Response Time | 150 ms (5-20 mA), 75 ms (20-40 mA), 25 ms (>40 mA) | |
| CT Turns Ratio | 200 to 300 | |
| Internal Oscillator Frequency | 2 MHz |
Key Features
- Self-test and lockout functionality on power-up and at regular intervals (every 17 minutes)
- Single Current Transformer (CT) detection for both differential and grounded-neutral faults
- Proprietary impedance measurement and signal processing techniques to minimize external components
- Specialized DSP controller for superior immunity to nuisance loads without external analog filters
- Optimized solenoid deployment to avoid energizing near AC mains zero crossings
- Randomized testing sequence to minimize noise and potential interactions on the AC mains
- >5 mA SCR driver for high Igt SCR’s
- Low power consumption: < 15 mW @ 6 V
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
- Load panel GFCI breakers
- GFCI receptacles
- In-line GFCI circuits (power cords)
Q & A
- What is the primary function of the NCS37010MNTWG? The primary function is to serve as a signal processor for Ground Fault Circuit Interrupter (GFCI) applications with self-test and lockout capabilities.
- What standards does the NCS37010MNTWG comply with? It is fully compliant with UL943 standards.
- What types of faults can the NCS37010MNTWG detect? It can detect both differential and grounded-neutral faults.
- How often does the NCS37010MNTWG perform self-tests? It performs a self-test at power-up and then every 17 minutes if the load is connected.
- What is the operating temperature range of the NCS37010MNTWG? The operating temperature range is -40°C to 85°C.
- What is the power consumption of the NCS37010MNTWG? The power consumption is less than 15 mW at 6 V.
- What types of packages are available for the NCS37010MNTWG? It is available in QFN16 and TSSOP-20 packages.
- How does the NCS37010MNTWG handle nuisance loads? It features a specialized DSP controller that offers superior immunity to nuisance loads without the need for external analog filters.
- Is the NCS37010MNTWG environmentally friendly? Yes, it is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What are some typical applications of the NCS37010MNTWG? Typical applications include load panel GFCI breakers, GFCI receptacles, and in-line GFCI circuits (power cords).
