STEVAL-SCR002V1 Inrush Current Limiter

STMicroelectronics' STEVAL-SCR002V1 introduces a simple and innovative AC/DC front-end circuit to allow inrush current limitation in any converter with input rectifier bridge topologies. This discrete control circuit consisting of one Z0110MN SMD TRIAC and two STTH110A diodes offers a compact and non-insulated high-voltage driver for the mains SCR. The drive circuit synchronizes the SCR gate signals with the AC line polarity and powers the SCR gate directly from the mains. This operation does not generate reverse losses in the SCRs.

This STEVAL-SCR002V1 solid-state solution provides high reliability, long service lifetime, electromagnetic interference reduction, and faster response than electromechanical solutions.

This solution is compatible with inrush current limitation performed either in the NTC/PTC bypass mode or in the MCU phase-control mode. The enable control pin of the SCR driver is referenced to GND_DC, so an uninsulated power supply or direct control by the MCU can be used. With five wires to connect, the STEVAL-SCR002V1 is designed for easy implementation on existing AC-DC converters for plug-and-play tests. It is suitable for applications with an RMS current of up to 4.3 A (at an ambient temperature of +60°C).

Features

• Two TN1605H-6T 16 A to 600 V Hi T_J SCRs in a TO-220 package, used to bypass the inrush resistor
• Compact solution: 43.6 mm x 28.5 mm (≈1.8 in²)
• Compatible with AC/DC converters with or without PFC in all modes: CCM, CRM, and DCM
• Enable signal (EN = 3.3 V to 15 V) versus GND_DC (DC or PWM signal)
• Suitable for applications from 50 W up to 1,000 W (230 V_RMS, T_AMB = +60°C)
• Compliant with AC or DC input voltage: 90 V_AC to 265 V_AC, 50/60 Hz, or 120 V_AC to 400 V_AC
• Robust, immune (2 kV IEC 61000-4-5, 4 kV IEC 61000-4-4)
• Low EMI noise (EN55014 and EN55022) solution