S T E VA L - I S A 1 9 2 V 1 7 W dual output flyback converter with standby managed by capacitive touch using VIPer0P and STM32L Data brief Description This offline converter key feature is the zero power mode (ZPM), an idle state during which the device is totally shut down. The IC enters ZPM by pulling the OFF pin to SGND for more than 10 ms and exits ZPM (resuming normal switching) by pulling the ON pin to SGND for more than 20 s. This function can be tested via the tactile switches connected to the ON and OFF pins. In ZPM the mains power consumption at 230 V AC can be below 5 mW the STEVAL-ISA192V1 evaluation board consumption is 30 mW due to Features the MCU polling strategy implemented at firmware level. Smart standby architecture using the zero power mode (ZPM) for capacitive touch The board has a dual output (i.e., - 5 V and + 7 V sensing in consumer electronics applications based on flyback topology). The negative output Enhanced system reliability thanks to is obtained by just connecting EAGND to the VIPer0P 800 V avalanche rugged negative rail and a voltage divider among FB, technology and its embedded protection EAGND and SGND. The positive output derives Minimized system input power consumption: from the turn ratio of the transformer secondary less than 30 mW at 230 V in ZPM AC windings. IEC55022 Class B conducted EMI To achieve extremely low input power compliant, even with reduced EMI filter, consumption, the IC is biased through a diode thanks to the frequency jittering feature coming from the + 7 V, which maintains the V CC IEC61000-4-2 (ESD), IEC61000-4-4 (EFT) voltage high enough (> 4.5 V) to prevent the and IEC61000-4-5 (Surge) compliant internal HV current source activation. RoHS compliant The STEVAL-ISA192V1 is equipped with the STM32L0 microcontroller which detects tactile push buttons and capacitive touch interface. The STM32L0 core manages VIPer0P to achieve minimum power consumption in ZPM, while supplying the microcontroller and user interface (capacitive touch and push button) and still maintaining the overall efficiency quite high in standard operation mode. February 2017 DocID030285 Rev 1 1/5 www.st.com For further information contact your local STMicroelectronics sales office STEVAL-ISA192V1 characteristics STEVAL-ISA192V1 1 STEVAL-ISA192V1 characteristics Non-isolated flyback topology 85 265 VAC input voltage range Dual output: + 7 V, 400 mA - 5 V, 800 mA 60 kHz fixed frequency operation Push button and capacitive touch interface for ZPM Input power consumption in ZPM: Less than 10 mW at 85 VAC Less than 30 mW at 230 VAC Less than 40 mW at 265 V AC Built-in soft start for improved system reliability Auto restart protections: overload/short circuit, maximum duty cycle counter, VCC clamp, thermal shutdown Pulse-skip protection to prevent flux runaway SMPS board dimensions: 74 x 45 mm 2/5 DocID030285 Rev 1