STEVAL-ISA125V1 5 V / 10 W, 60 kHz isolated flyback with extra power management based on the VIPer28LN Data brief Description The STEVAL-ISA125V1 is a 5 V, 2 A demonstration application with 3.3 A peak current capability of 1.9 sec, using the new VIPer28LN offline high-voltage converter from STMicroelectronics. In some applications, an SMPS can have load peaks which may be two or more times as high as the power it is supposed to deliver, though only for a short time compared to the thermal time constants of the power components. Typical examples of such loads include printers and audio systems. In such cases, it is more cost-effective to Features thermally design the system for maximum Input voltage range: 90 V - 265 V continuous power and not for peak power RMS RMS demand, which is sustained only for a limited Output voltage: 5 V time. Max output current: I max = 2 A OUT Such a design is possible thanks to the EPT Peak output current: I pk = 3 A OUT function of the VIPer28LN, which allows Precision of output regulation: V 5% designers to fix the maximum time window during OUT LF which the converter is able to manage the peak High frequency output voltage ripple: power and still maintain output voltage regulation. V = 50 mV OUT HF If the overload period exceeds the time window, Max ambient operating temperature: T = A the converter is automatically shut down and 60 C enters auto-restart mode until the overload is 800 V avalanche-rugged power section removed, thus preventing damage to the power components. PWM operation at 60 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 standby power (< 50 mW at 265 V ). ac Adjustable, accurate overvoltage protection, thermal shutdown with hysteresis, delayed overload protection June 2013 DocID024831 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Schematic diagram STEVAL-ISA125V1 1 Schematic diagram Figure 1. STEVAL-ISA125V1 circuit schematic 7 %5 ( . 9 X) 6736 / - / ( * , %5 F Q 677+ / X+ &21 F Q X) 9 X) = & 0 1 9 X) = & 0 % 7 5 ( 0 5 2 75 16) 3 & J H 0 & Q) < 7 N KRNH & N & Q) 9,3(5/ + 9 1 , N (3 7 17& / &21752 7& 1 K P 2 N U 9 X) )% 62 ( 85& Q) ) 6( 8 ) X) 9 95 N Q) Q) N 76 Q) N N - &21 - - - 2/4 DocID024831 Rev 1 5 5 & 5 & & 5 & & 17 &2 & 5 3& 23 72 5 5 5 8 5 &0 5 5 5 & & & & & & & SN 9