STEVAL-ISA119V1 1.5 W double output buck demonstration board based on the VIPER16LD Data brief Description The STEVAL-ISA119V1 is a dual output buck demonstration board using the VIPER16LD, a new off-line high voltage converter by STMicroelectronics which has been specifically developed for non-isolated SMPS. Output regulation is easily achieved through a voltage divider to the output voltage. The VIPER16LD can work with or without an external supply. In the former case, very low standby consumption is possible(< 50 mW at 265 V ) while in the latter case, the cost and ac complication of the IC supply network may be reduced. Features The other features of the device include an 800 V Input voltage range (V ): 90 V to 265 IN RMS avalanche-rugged power section, PWM operation V RMS at 60 kHz with frequency jittering for lower EMI, Output voltage 1 (V ) = 12 V limiting current with adjustable set point, on-board OUT1 soft-start and safe auto-restart after a fault Max output current 1: (I ) = 0.1 A OUT1 condition. Output voltage 2: (V ) = 5 V (through LDO) OUT2 The available protection features are thermal Max output current 2: (I )= 0.05 A OUT2 shutdown with hysteresis and delayed overload Precision of output regulation V = 5% OUT LF protection. High frequency output voltage ripple V = 50 mV OUT HF Max ambient operating temperature T = 60 C A June 2013 DocID024486 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Schematic diagram STEVAL-ISA119V1 1 Schematic diagram Figure 1. STEVAL-ISA119V1 circuit schematic & 9 , 3H / U - 5 & 1 & &2 0 3 5 5 % 1 & 5 1 & /, 0 5 1 & 9 & 5 X W & & & 5 , 1 1 , 1 5 / 5 , 1 1 & X W *1 5 , 1 *1 5 , 1 &LQ ,& & & & & 2/4 DocID024486 Rev 1 9R / & 9R )%