STEVAL-ISA126V1

STEVAL-ISA126V1 5 V-2 A, 115 kHz flyback with temporary extra-power management based on the VIPER28HN Data brief Description This document describes a 5 V-2 A application with 3.3 A peak current capability for 1.9 sec, using VIPer28H, a new off-line high voltage converter from STMicroelectronics. Features • • • • • • • • • • • • • • Input Voltage range: 90 VRMS to 265 VRMS Output Voltage: 5 V Max Output Current: IOUTmax 2 A Peak Output Current: IOUTpk 3 A Precision of output regulation: ΔVOUT_LF ±5% High Frequency output Voltage ripple: ΔVOUT_HF 50 mV Max ambient operating temperature: TA 60 ºC 800 V avalanche rugged power section PWM operation , at 115 kHz with frequency jittering for lower EMI Limiting current with adjustable set point On-board soft-start Safe auto-restart after a fault condition, low stand-by power (< 50 mW at 265 Vac) Adjustable and accurate over voltage protection, thermal shutdown with hysteresis, delayed overload protection RoHS compliant December 2013 In some applications an SMPS, normally supposed to deliver a certain amount of power, from time to time undergoes load peaks that can be even two or more times as much, but only for a time interval which is short if compared to the thermal time constants of the power components. Typical examples of such loads are printers and audio systems. In these cases, it is more cost-effective to thermally design the system for the maximum continuous power and not for the peak power demand, which will be sustained only for a limited time window. Such a design is possible thanks to the EPT function of VIPER28H, which allows the designer to fix the maximum time window during which the converter is able to manage the peak power still maintaining output voltage regulation. If the overload lasts more than this time window, the converter is automatically shut down in autorestart mode, in order to avoid the damaging of the power components. DocID025423 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com Schematic circuit STEVAL-ISA126V1 1 Schematic circuit 1.1 Schematic circuit Figure 1: Schematic circuit + t - 2/4 DocID025423 Rev 1 STEVAL-ISA126V1 2 Revision history Revision history Table 1: Document revision history Date Revision 10-Dec-2013 1 DocID025423 Rev 1 Changes First release 3/4 STEVAL-ISA126V1 Please Read Carefully Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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