STEVAL-ISA008V1 Low cost wide range power supply for LCD or TV, 28 W output demonstration board based on the VIPer53-E Data brief Features Input voltage Vin: 90 - 264 Vrms f: 45-66 Hz Output voltages 3.3 V 2 % at 1 A - dedicated to panel and digital circuitry for scaling 7 V 8 % at 0.2 A - dedicated to post- regulator for microprocessor 12 V 8 % at 2 A - dedicated to backlight lamp inverters, audio and SCART 35 V 10 % at 10 mA - dedicated to tuner for TV-LCD STEVAL-ISA008V1 Standby Input power less than 1 W at 230 Vac, delivering 30 mA on 7 V The standby performance is very good, and the Overcurrent protection power consumption during standby is 800 mW at On all outputs, with auto-restart at short 230 Vac. removal The circuit is also fully protected against faults PCB type & size such as output short-circuit or overvoltage. Cu single side 35 mm, CEM-1, 130 x 70 The design pays particular attention to the final mm cost of the solution, so the PCB has been Safety designed as single layer, and the circuit has no According to EN60950, creepage and heat sink. The technology used is the standard clearance minimum distance 6.4 mm through-holes, but can be easily changed to SMT as most of the components are available also in Emc this technology. The circuit has been tested According to EN50022 Class B thoroughly in all the most relevant aspects with RoHS compliant positive results and has been integrated with a 15 LCD-TV application without showing any Description problems. The STEVAL-ISA008V1 demonstration board is a 28 W switch mode power supply which can be used to supply an LCD monitor or even an LCD- TV, with 15 or 17 panels and 2 lamps for backlight together with multimedia functions such as audio. The SMPS accepts a full range input voltage (90 to 265 Vrms) and can deliver four output voltages dedicated to the scaler (3.3 V), to the mP (7 V), to the backlight and audio (12 V), and to the TV tuner (35 V). November 2010 Doc ID 18217 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 C2 F1 L2 1N0-Y1 FUSE 2A 20mH - SUMIDA D4 CON1 DF06M T1 24140011 D 2 1 2 2 1 2 14 C16 R11 C3 1N0 47R 1 220N 4 3 CON2 D7 D8 1.5KE180A 12V 2A MOLEX 2 13 STPS8H100CF 1 R1 C4 D5 NTC 16R S236 STTH106 R8 2 12V 2A 68uF-400V 90-264Vrms 5K6 C11 1000uF-25V YXF C7 C12 1000uF-25V YXF 100N 4 12 3 GND D9 GND 4 BYW100-200 11 5 GND R9 R12 RES C17 C8 6 7V 0.2A 470uF-16V YXF 100N 1R5 6 10 3.3V 1A 7 D2 L1 1N4148 D1 2.7uH ELC08D R13 STPS3L60 8 3.3V 1A 3K65-1% C15 8 47uF-25V C20 7 220PF-2KV CONN 8P C13 C14 R10 C9 2200uF-6.3V YXF 100uF-25V YXF 180R 100N 2 9 OSC R14 470R D6 C18 STTH106 10N C1 C10 100N 1N0-Y1 U3 VIPER53 DIP C19 15NF R5 1K0 U1 R6 SFH617A-2 RES R3 1K5-1% C5 RES R4 R7 4K7-1% RES R2 C6 33K 100N 3 U2 TL431 R15 1K8 Q2 Q1 BC547B D3 R16 BC547B 1N4148 1K0 Circuit schematic STEVAL-ISA008V1 1 Circuit schematic Figure 1. Circuit schematic 7 VDD 4 TOVL 1 COMP 3 SOURCE 5 DRAIN 4 SOURCE 3 4 3 4 2 1 2 1 2/4 Doc ID 18217 Rev 1 AM03293v1