STEVAL-ISA010V1 STMicroelectronics

STEVAL-ISA010V1 Ultra wide range dual output back converter demonstration board based on the VIPER16 Data brief Features Input voltage Vin: 85 - 500 VAC (f: 45 - 66 Hz) Output voltages: V1= 12 V 10% V2= 5 V 4% Output current: 150 mA total (5 V and 12 V output) output current for full input voltage range Standby: 96 mW at 230 VAC STEVAL-ISA010V1 Short-circuit protection PCB type and size: after any fault condition removal. Burst mode FR4, single side 70 m operation at light load combined with the very low dim.: 27 x 45 mm consumption of the device helps to meet standby energy-saving regulations. Isolation: non isolated - N connected to output GND The significant benefit of this new chip derives from the jitter of the switching frequency and the EMI: In accordance with EN55022 - class B possibility to supply the chip directly from the DC EMC: surge - IEC 61000-4-5 - 2 kV HV bus, so auxiliary supply is not mandatory. EMC: burst - IEC 61000-4-4 - 8 kV The VIPER16 is suitable for flyback or buck RoHS compliant topologies and thanks to an internal self-supply circuit it does not require an auxiliary supply. Description This demonstration board based on VIPER16 is designed as an example of a simple non-isolated auxiliary power supply for a range of input voltages from 85 VAC to 500 VAC. There is an ever-increasing demand for small power supplies capable of working without voltage range limitations, even at nominal levels of 400 VAC and 415 VAC, respectively. The real voltage level can reach 500 VAC (415 V + 20%). The major markets for this type of SMPS are home appliances and metering. The VIPER16 device includes an 800 V rugged power switch, a PWM controller, programmable overcurrent, overvoltage, overload, a hysteretic thermal protection, soft-start and safe auto-restart May 2009 Doc ID 15674 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Circuit schematic and PCB layout STEVAL-ISA010V1 1 Circuit schematic and PCB layout Figure 1. Schematic diagram D 1N4148 1 U VIPer16 D D L 2.2 mH 1 D R 22 3 4 R 1 1 2 3 4 7 STTH108 Drain FB R 8 750 k C 2 Drain 9 24 k C 1N4007 1N4007 C 8 J 3 10 F 2 2 100 nF 10 F / 450 V R V R / 35V 4 1 DD J U L78L05 C 5 750 k 1 2 9.1 k 2 1 150 nF / X2 1 2 3 1 V V COMP LIM S IN OUT 1 mH L 2 R 750 k 3 5 3 6 GND C D 2 C C 4 6 2 Output 85 - 500 VAC 150 nF / X2 R N.A. C 6 R 750 k 10 F / D 15 V 7 5 C 5 10 F 8 7 1.8 nF 450 V 220 F STTH108 / 35 V / 25 V R 1 k 9 AM00361 Figure 2. PCB layout of the buck converter (top, bottom, bottom layout) 2/4 Doc ID 15674 Rev 1 1