STEVAL-ISA013V1

STEVAL-ISA013V1 Dual output off-line wide range 24W power supply evaluation board for VIPer53 Data Brief Features ■ Switch mode general purpose power supply ■ Input: 85 to 264Vac @ 50/60Hz ■ Output: 12V @ 1A & 5V @ 2.4A ■ Output power (peak) : 24W ■ Switching frequency 100kHz ■ Current mode control ■ 75% efficiency ■ Auxiliary undervoltage lockout with hysteresis ■ Output short circuit protection ■ Thermal shutdown protection ■ Meets EN55022 Class B EMI specification ■ Meets Blue Angels ) s ( ct u d o r P e Description STEVAL-ISA013V1 ) s ( t t e l ST components o s b -O This evaluation board is an off-line wide range dual output general-purpose power supply capable of delivering up to 24W through two outputs, +5V and +12V. The board is configured for secondary regulation with optocoupler feedback. c u d ro P e ■ VIPer53 ■ STTA106 ■ BYW98-200 ■ TL431A ■ STPS5L40 ■ 1.5KE220A t e l o Other output voltages can easily be achieved by changing the transformer and a few components on the board, as shown in the application note. s b O Transformers are readily available for the following configurations: ■ 5V/12V ■ 5V/15V ■ 5V/24V July 2007 Rev 1 For further information contact your local STMicroelectronics sales office 1/5 www.st.com 5 STEVAL-ISA013V1 General circuit description 1 General circuit description The evaluation board operates from 90 to 264Vac input with an output power peak of 24W through two output voltages of +5V and +12V. The AC input is rectified and filtered by the bridge BR1 and the bulk capacitor C2 to generate the high voltage DC bus applied to the primary winding of the transformer, T1. The switching frequency is set at 100kHz through R3 and C5. Secondary regulation is provided by an optocoupler and a programmable voltage reference (TL431). ) s ( ct The transformer is designed and manufactured by Cramer Coil and Transformer Company, Inc. This evaluation board has an efficiency of 78% at 115Vac at full load for both outputs. u d o The evaluation board consumes less than 1W total power consumption when working in burst mode during standby operation and therefore, meets Blue Angel norm. r P e t e l o ) (s t c u d o r P e t e l o s b O 2/5 s b O 3W R1 5ohms 0.047uF C1 F1 FUSE 2A 5X20mm 250V C17 0.33uF 250V L1 2 X 35mH 4 3 C18 0.33uF 250V 2 3 BR1 KBP210GDI All resistors are 1/4 W 5% unless specified. All capacitors are in uF and 50 V unless specified. AC in 85 to 264Vac CON2 1 2 J1 Line 2 1 1 + D5 1.5KE220A C3 4700pF 1kV C4 100uF 25V C2 68uF 400V C5 4.7nF R3 3k 1 R2 22k 2W C7 470nF R5 3.3K 3 2 1k R4 15 Source Osc nc Vdd TOVL 1N4148 Comp U4 D1 D2 STTA106 2W R12 D3 STTA106 2 1 6 7 8 C14 100pF Drain C12 0.01uF 50V 0 VIPer53DIP Source 5 s b O 4 0 2 3 1 5 1 . . . . TX1 1 W2 C6 2.2nF W1 2 2 C10 10 11 6 7 8 9 2 4.7nF Y1 cap . . . . . . 1 3 U2 LTV817 U3 TL431 ST 2 1% R6 2.49K C11 0.01uF R7 1k + C8 2700uF 16V 10uH L2 BYW98-200 C15 1000uF 25V 1 D4 + C19 2700uF 16V 1Kv 470pF C13 R8 68 STPS5L40 D6 4 3 s b O t e l o 1 P e 2 d o r t c u ) (s 1 1% R9 2.49K 12V @ 1A + C16 1000uF 25V gnd C9 330uF 25V 5V @ 2.4A 1 2 3 4 J2 Figure 1. 2 2 4 - R10 22 STEVAL-ISA013V1 Board schematic Board schematic Scheme r P e u d o ) s ( ct t e l o 3/5 STEVAL-ISA013V1 Revision history 3 Revision history Table 1. Revision history Date Revision 20-Jul-2007 1 Changes Initial release. ) s ( ct u d o r P e t e l o ) (s t c u d o r P e t e l o s b O 4/5 s b O STEVAL-ISA013V1 ) s ( ct Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. u d o r P e All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. t e l o No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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