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9.4W, 15V-5V-3.3V, three-output isolated flyback converter using VIPER26HD for smart meter and power line systems

STEVAL-ISA175V1

Overview

The STEVAL-ISA175V1 evaluation board implements a three output isolated flyback specifically designed to supply the STCOMET smart meter and powerline communication system.

The board is developed using the VIPER26HD offline high-voltage converter by STMicroelectronics. The device features an 800 V avalanche-rugged power section, PWM operation at 115 kHz with frequency jittering for lower EMI, current limiting with adjustable set point, on-board soft-start, safe auto-restart after a fault condition and low standby power.
The power supply provides 15 V @ 550 mA_rms (700 mA peak) to the power line modem (PLM) and the analog circuitry, a post-regulated 5 V @ 100 mA and a 3.3 V @ 200 mA supply through a dedicated DC-DC converter connected on the 15 V rail for digital circuitry and other low voltage parts.
The power supply is designed to operate across an extended 90 to 440 V_AC mains input voltage range to also be used with a phase-to-phase connection in a three-phase network.
The board can be used in a stand-alone configuration or with the dedicated STCOMET development kit and the PCB layout is specifically designed to fit inside a real meter.

Main features

Triple output voltage: 15 V @ 0.55 A_rms (0.7 A peak), 3.3 V @ 200 mA and 5 V @ 100 mA
Extended AC mains input voltage range: 90 V_AC to 440 V_AC
Meets STCOMET smart meter and power line communication system specs
EMC with EN55022, EN61000, EN61000-4-4, EN61000-4-5, EN61000-4-6
RoHS compliant

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-03 20:57:15

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