STEVAL-ISA012V1 STMicroelectronics

STEVAL-ISA012V1 3 phase power supply with VIPer and Power MOSFETs Data Brief Features Minimum AC input voltage = 90 V AC Maximum AC input voltage = 450 V AC Time of hold up capability > 50 ms Mean input power < 6 W (in compliance with IEC62053-21) Input connections allowed: 1-phase with neutral STEVAL-ISA012V1 2-phase without neutral 3-phase with neutral V = 5 V, I = 10 mA OUT1 OUT1 Typical end applications for this solution can be V = 3.3 V, I = 100 mA found in the industrial market in the range below 5 OUT2 OUT2 W, such as three-phase and single-phase power Maximum precision error = 3% meters, industrial bias power supplies and Maximum ripple voltage = 50 mV auxiliary SMPS for high voltage street lighting, Line regulation = +/- 1% where the input voltage can range from 90 V to AC 450 V and 1000 V Power MOSFETs are AC Load regulation = +/- 1% currently used. Output power (peak) = 550 mW Description This reference design represents a cost effective solution for low power high voltage power supplies. It has been developed to cover applications requiring an ultra-wide input voltage range (between 90 and 450 V ), typical of three- AC phase applications. This requires the use of very high voltage components, which increases cost, size, weight and the overall complexity of the power supply. The circuit includes a switching transistor connected between the input rectifier and the DC bulk capacitor (STMicroelectronics patent). The series switch limits the DC input voltage of the power converter by means of a driving circuit thus the SMPS primary transistor can be selected as a standard part as well as a smart power primary IC. November 2007 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Board schematic STEVAL-ISA012V1 1 Board schematic Figure 1. Schematic 2/4 RF1 L1 Q1 C1 NTC1 22E 0.75W 1mH STD3NK50Z 2.2nF/2kV (Y1) 50E P1 2 3 RV1 L2 SO5K275/275V D1 D6 VDD 5V 10mA R1 T1 TMBAT49 10uH 100mA SMD D5 1 10 330K SMD -+ C2 RV2 4 3 ZMM 15 SOD-80 SO5K275/275V 220nF C5 + C6 + R2 330uF 25V 630V C4 2 6 22uF 25V 330K SMD SMD RF2 BRIDGE 2.2uF450V P2 22E 0.75W + 3.3V P3 R3 C3 RF3 330K SMD 220nF 22E 0.75W D2 4 U2 L4931ABD33 630V 3.3V 100mA SMD 8 1 VOUT VIN -+ RV3 4 3 D3 R4 SO5K275/275V 180V 5 10E C7 + SMD RF4 D4 2.2uF 25V 22E 0.75W BRIDGE 180V N D7 R7 LL4148 R5 R6 4.7K 220E SMD 1K SMD SMD U4 PC817 GND R9 C8 5.6K SMD 10uF 50V + U1 C9 100nF 50V U3 Note: 3 TS2431 SMD FB VIPer12AS 3 Layout Hints: Q1 mounted on 1cm x 0.8cm copper area. C8&C10 have to be closed to the VIPer12AS. R8 GND Pins for U2 have to be soldered to a unique 4.7K SMD copper area. C10 47nF 50V SMD 1 2 1 2 1 4 Vdd 5 D 2 6 S D 1 7 S D 8 D 3 4 2 1 2 1 2 GND 3 GND 6 GND 7 GND 4 NC 5 INH